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Search for "calixarene" in Full Text gives 38 result(s) in Beilstein Journal of Organic Chemistry.

Switchable molecular tweezers: design and applications

  • Pablo Msellem,
  • Maksym Dekthiarenko,
  • Nihal Hadj Seyd and
  • Guillaume Vives

Beilstein J. Org. Chem. 2024, 20, 504–539, doi:10.3762/bjoc.20.45

Graphical Abstract
  • two bipyridine-calixarene units linked by a flexible spacer (Figure 15a) [59]. In the non-complexed state, the system presents no cavity. But, when copper(I) is introduced, a complex is formed with the two bipyridine units bringing the two calixarenes close to each other and creating a cavity suitable
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Published 01 Mar 2024

Insight into functionalized-macrocycles-guided supramolecular photocatalysis

  • Minzan Zuo,
  • Krishnasamy Velmurugan,
  • Kaiya Wang,
  • Xueqi Tian and
  • Xiao-Yu Hu

Beilstein J. Org. Chem. 2021, 17, 139–155, doi:10.3762/bjoc.17.15

Graphical Abstract
  • negatively charged CoPyS and EY was suppressed by the inclusion of γ-CD. Calixarene-based photocatalysis CAs are derived from the shape of the chalice. They can be obtained by bridging phenolic units through methylene groups in the meta-position. Their rigid goblet structure has two edges. The wider upper
  • supramolecular hosts to recognize guests through hydrophobicity, π–π stacking, cation–π interactions, ion–dipole interactions, etc. [31][32]. Due to the cavity-shape limitation of calixarenes, most calixarene-based photocatalytic systems are mainly based on the fabrication of hybrid materials for energy transfer
  • and photocatalysis [33][34][35]. Su and co-workers reported a hybrid material based on a calixarene-modified dye and TiO2 (HO-TPA–TiO2) [36]. The calixarene could combine with TiO2, providing efficient electron transfer between them (Figure 11). The TPA–TiO2 system exhibits an efficient H2 evolution
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Published 18 Jan 2021

Chiral anion recognition using calix[4]arene-based ureido receptors in a 1,3-alternate conformation

  • Tereza Horáčková,
  • Jan Budka,
  • Vaclav Eigner,
  • Wen-Sheng Chung,
  • Petra Cuřínová and
  • Pavel Lhoták

Beilstein J. Org. Chem. 2020, 16, 2999–3007, doi:10.3762/bjoc.16.249

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  • for N-acetyl-ʟ-phenylalaninate. The structures of some receptors were confirmed by single crystal X-ray analysis. Keywords: anion recognition; calixarene; chiral receptor; complexation; enantiodiscrimination; Introduction The recognition and complexation of anions has become undoubtedly one of the
  • different conformations. Although the overwhelming majority of calixarene-based receptors makes use of the cone conformer A (Figure 1), the corresponding diureidocalix[4]arenes in the 1,3-alternate conformation B showed [42][43] surprisingly good complexation abilities towards selected anions. Especially
  • reaction conditions [44]. Refluxing the reaction mixture of PPh3, DIAD, and toluene for two days provided the distally dialkylated calixarene 2 in 64% yield (Scheme 1). Compound 2 was regioselectively ipso-nitrated with 30 equiv of 65% aq HNO3 in an AcOH and CH2Cl2 mixture, making use of the higher
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Published 07 Dec 2020

NMR Spectroscopy of supramolecular chemistry on protein surfaces

  • Peter Bayer,
  • Anja Matena and
  • Christine Beuck

Beilstein J. Org. Chem. 2020, 16, 2505–2522, doi:10.3762/bjoc.16.203

Graphical Abstract
  • negatively charged sulfonate [20][21][22][24][25][27][28][29][30][31][32][34][36][37] or phosphonate [23][33][35] substituents, the aliphatic side chain of the amino acid lines the aromatic bowl-like structure of the calixarene, while the positively charged end group being situated between the sulfonate or
  • adds more hydrophobic interactions with the aromatic side walls of the bowl-shaped calixarene core. A similar, but even more pronounced trend, is observed for the pumpkin-shaped macrocycle cucurbit[7]uril, favoring the trimethylated over unmethylated lysine by a factor of 3500 [49]. Methylated lysines
  • epigenetic reader proteins [30][31][32]. Negatively charged calixarene ligands have further been used to inhibit enzymatic activity [33][34][35] and amyloid fibril formation [36][37][38]. Calix[4]arenes with positively charged substituents like guanidinium groups lining the top of their bowl-shaped core have
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Published 09 Oct 2020

Multiple threading of a triple-calix[6]arene host

  • Veronica Iuliano,
  • Roberta Ciao,
  • Emanuele Vignola,
  • Carmen Talotta,
  • Patrizia Iannece,
  • Margherita De Rosa,
  • Annunziata Soriente,
  • Carmine Gaeta and
  • Placido Neri

Beilstein J. Org. Chem. 2019, 15, 2092–2104, doi:10.3762/bjoc.15.207

Graphical Abstract
  • stereoselective formation of endo-alkyl pseudo[n]rotaxane stereoisomers. Keywords: calixarene; multiple-threading; pseudo[n]rotaxane; stereoisomers; Introduction The self-assembly [1] of smaller components to larger aggregates represents one of the most spectacular phenomena in supramolecular chemistry [2][3][4
  • alkylammonium cations, as TFPB− salts, inside the aromatic cavity of calixarene [20] and dihomooxacalixarene hosts [21][22]. Thus, through this ‘superweak anion’ approach, we have synthesized interesting examples of calixarene/ammonium-based interlocked structures such as calix-rotaxanes [23][24] and calix
  • minimum-energy structure of (4+)36 obtained by molecular mechanics calculations (Figure 8). As it is known [17][18], the threading of directional (or constitutionally asymmetric) alkylbenzylammonium axles with directional calixarene-wheels, could generate two diastereoisomeric pseudo[2]rotaxanes (Figure 9
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Published 03 Sep 2019

Attempted synthesis of a meta-metalated calix[4]arene

  • Christopher D. Jurisch and
  • Gareth E. Arnott

Beilstein J. Org. Chem. 2019, 15, 1996–2002, doi:10.3762/bjoc.15.195

Graphical Abstract
  • yielding transformations to azide and 1,2,3-triazole derivatives which may have application in other areas of research. Keywords: calixarene; inherent chirality; mesoionic carbene; mononitration; ruthenacycle; Introduction Calix[4]arenes are a class of diverse macrocyclic compounds which have been the
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Published 22 Aug 2019

Complexation of a guanidinium-modified calixarene with diverse dyes and investigation of the corresponding photophysical response

  • Yu-Ying Wang,
  • Yong Kong,
  • Zhe Zheng,
  • Wen-Chao Geng,
  • Zi-Yi Zhao,
  • Hongwei Sun and
  • Dong-Sheng Guo

Beilstein J. Org. Chem. 2019, 15, 1394–1406, doi:10.3762/bjoc.15.139

Graphical Abstract
  • and potential applications according to the diverse photophysical responses are provided. Keywords: calixarene; host–guest complexation; luminescent dyes; macrocycles; photophysical properties; Introduction Fluorescence sensing represents a powerful detection methodology due to its low cost, ease of
  • supramolecular cavities [25]. Calixarenes are the third generation of macrocyclic compounds composed of phenolic units bridged with methylene groups at the o-positions of phenolic hydroxy groups [9]. We have focused on molecular recognition and self-assembly of water-soluble calixarene derivatives for a long
  • covalent linked calixarene via proton-coupled electron transfer [62]. Kitamura and co-workers reported that the complexation of SC4A could quench the luminescence of tris(2,2'-bipyridine)Ru(II) dichloride (Ru(bpy)3), where SC4A serves as a PET quencher [63]. Shinkai and co-workers reported that the
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Published 25 Jun 2019

Host–guest interactions between p-sulfonatocalix[4]arene and p-sulfonatothiacalix[4]arene and group IA, IIA and f-block metal cations: a DFT/SMD study

  • Valya K. Nikolova,
  • Cristina V. Kirkova,
  • Silvia E. Angelova and
  • Todor M. Dudev

Beilstein J. Org. Chem. 2019, 15, 1321–1330, doi:10.3762/bjoc.15.131

Graphical Abstract
  • of p-sulfonatocalix[4]arene and some inorganic and organic cations in aqueous solution [32]. The predicted ΔG value (relative Gibbs energy) of the complexation between the host calixarene molecule and hydrated La3+ cation (with an average coordination number of water molecules in the first hydration
  • descriptors of the group IA, IIA and f-block metal cations binding to the host calixarene systems have been evaluated and the factors that affect the interactions in the gas phase and in water medium have been unraveled. Available data on the experimental pKa values [31][33][34] imply that in acidic water
  • solution of pH ≈ 2 the host calixarene systems have all the sulfonic acid groups deprotonated and all the phenolic hydroxy groups protonated thus the anionic structures shown on Scheme 1 were modeled and employed in our computational studies. Studies on the thermodynamic behavior and recognition processes
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Published 17 Jun 2019

Fabrication, characterization and adsorption properties of cucurbit[7]uril-functionalized polycaprolactone electrospun nanofibrous membranes

  • Changzhong Chen,
  • Fengbo Liu,
  • Xiongzhi Zhang,
  • Zhiyong Zhao and
  • Simin Liu

Beilstein J. Org. Chem. 2019, 15, 992–999, doi:10.3762/bjoc.15.97

Graphical Abstract
  • ratio of PCL/CB[7] is 100:200), which is far higher than the CDs content in CD-functionalized nanofibers [13][14][15] and the calixarene content in the calixarene-functionalized nanofibers [20]. Figure 1 presents the SEM photographs and fiber diameter distributions of neat PCL and the PCL/CB[7
  • observations have been also reported for CD-functionalized nanofibers [12] and calixarene-functionalized nanofibers with high loading [20]. The diameter distribution and AFD of the PCL/CB[7] nanofibers also varied with the increase of CB[7] loading. When the mass ratio of PCL/CB[7] was 100:50, the diameter of
  • confirm the pseudo-second-order kinetic of PCL/CB[7] nanofibrous membranes. Actually, the adsorption kinetics of the PCL/CB[7] nanofibrous membranes agree with those of calixarene-functionalized [20] and CD-functionalized [37] nanofibrous membranes. The adsorption isotherm of MB by nanofibrous membranes
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Published 29 Apr 2019

Polyaminoazide mixtures for the synthesis of pH-responsive calixarene nanosponges

  • Antonella Di Vincenzo,
  • Antonio Palumbo Piccionello,
  • Alberto Spinella,
  • Delia Chillura Martino,
  • Marco Russo and
  • Paolo Lo Meo

Beilstein J. Org. Chem. 2019, 15, 633–641, doi:10.3762/bjoc.15.59

Graphical Abstract
  • providing no separation of the components. The mixtures were adequately characterized by means of combined HR-ESIMS, FTIR and NMR techniques and, despite their complexity, they were successfully used to accomplish the subsequent preparation of pH-sensitive calixarene hyper-reticulated nanosponge materials
  • addition, by subjecting the same materials to chemical post-modification, it is possible to introduce further groups able to provide responsivity to external stimuli. We have recently succeeded in obtaining NSs based on polyamino-cyclodextrins (ACDNs) [15] as well as mixed cyclodextrin–calixarene
  • . More recently, we also reported the synthesis of entirely synthetic calixarene nanosponges (CaNSs) [22], which can be prepared by means of the same CuAAC approach, by reacting a tetrakis(propargyloxy)calix[4]arene with a diazidoalkane. Of course, the reaction results in the formation of bis(1,2,3
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Published 12 Mar 2019

Pathoblockers or antivirulence drugs as a new option for the treatment of bacterial infections

  • Matthew B. Calvert,
  • Varsha R. Jumde and
  • Alexander Titz

Beilstein J. Org. Chem. 2018, 14, 2607–2617, doi:10.3762/bjoc.14.239

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  • inhibition of biofilm formation and synergistically acted with tobramycin to eradicate biofilm-embedded bacteria in vitro [44][45]. Also, the fucosylated tetravalent calixarene 14 proved a potent ligand to LecB (Kd = 48 nM) and showed beneficial effects in an acute murine pulmonary infection model following
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Published 11 Oct 2018

Calixazulenes: azulene-based calixarene analogues – an overview and recent supramolecular complexation studies

  • Paris E. Georghiou,
  • Shofiur Rahman,
  • Abdullah Alodhayb,
  • Hidetaka Nishimura,
  • Jaehyun Lee,
  • Atsushi Wakamiya and
  • Lawrence T. Scott

Beilstein J. Org. Chem. 2018, 14, 2488–2494, doi:10.3762/bjoc.14.225

Graphical Abstract
  • investigated. Keywords: azulene; calixarenes; calixazulenes; supramolecular chemistry; tetraalkylammonium salts; Introduction Among the great variety of synthetic macrocyclic molecular receptors which have been reported, those that are referred to by their generic name “calixarene” loom large [1][2][3]. The
  • reported in the literature [7]. Besides the classical calixarene phenolic subunits linked by methylene groups, “calixarenes” incorporating other subunits include, but are not limited to, resorcinol [8], hydroquinone [9], naphthols [10], pyrrole [11], heteroaromatics [12] and triptycene [13] in their cavity
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Published 25 Sep 2018

Calix[6]arene-based atropoisomeric pseudo[2]rotaxanes

  • Carmine Gaeta,
  • Carmen Talotta and
  • Placido Neri

Beilstein J. Org. Chem. 2018, 14, 2112–2124, doi:10.3762/bjoc.14.186

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  • and cone conformations. The interconversion between them cannot be obtained by simple rotation around the ArCH2Ar bonds of the calixarene wheel, which is blocked by the presence of the axle inside its cavity. Therefore, it can only be obtained through a mechanism of de-threading/re-threading of the
  • axle. In all the examined cases, the 1,2,3-alternate and cone atropoisomers are, respectively, the kinetic and the thermodynamic ones. Keywords: atropoisomers; calixarene; conformation; pseudorotaxane; social isomerism; Introduction Mechanomolecules [1][2][3][4], such as rotaxanes and catenanes show
  • threading a tertiary ammonium axles in a directional (non-flat) calixarene-wheel (II and II*, Figure 1) [17]. In this case the chirality is created by the directionality of the calixarene wheel in a cone conformation, which differentiates the two alkyl chains around the prochiral ammonium center. In 2010
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Published 14 Aug 2018

Synthesis of new p-tert-butylcalix[4]arene-based polyammonium triazolyl amphiphiles and their binding with nucleoside phosphates

  • Vladimir A. Burilov,
  • Guzaliya A. Fatikhova,
  • Mariya N. Dokuchaeva,
  • Ramil I. Nugmanov,
  • Diana A. Mironova,
  • Pavel V. Dorovatovskii,
  • Victor N. Khrustalev,
  • Svetlana E. Solovieva and
  • Igor S. Antipin

Beilstein J. Org. Chem. 2018, 14, 1980–1993, doi:10.3762/bjoc.14.173

Graphical Abstract
  • highly explosive [29]. Usually azide groups are installed in the upper rim of the macrocycle by a chloromethylation reaction and subsequent nucleophilic substitution by azide anions [30][31] forming rather flexible azidomethyl fragments. In this investigation more rigid arylazide calixarene derivatives
  • were chosen as precursors for the synthesis of the targeted macrocycles having an enlarged cavity for the effective binding of large biomolecules (Scheme 1). The targeted calixarene diazide derivative 4 and the corresponding tetraazide 8 were synthesized as outlined in Scheme 2. In the first step the
  • value corresponds to the dye–calixarene complex. In the case of 12a,b the differences of CAC values determined by EY and pyrene are not significant. Obviously, in this case EY does not form a neutral dye–calixarene complex due to the increased number of ionized groups in the tetrasubstituted calixarene
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Published 31 Jul 2018

Asymmetric Michael addition reactions catalyzed by calix[4]thiourea cyclohexanediamine derivatives

  • Zheng-Yi Li,
  • Hong-Xiao Tong,
  • Yuan Chen,
  • Hong-Kui Su,
  • Tangxin Xiao,
  • Xiao-Qiang Sun and
  • Leyong Wang

Beilstein J. Org. Chem. 2018, 14, 1901–1907, doi:10.3762/bjoc.14.164

Graphical Abstract
  • clearly showed that the upper rim-functionalized hydrophobic calixarene scaffold played an important role in cooperation with the catalytic center to the good reactivities and enantioselectivities. Keywords: asymmetric Michael addition reaction; calix[4]arene; cyclohexanediamine; thiourea; Introduction
  • nitrostyrene 7a lacking substituents has minimal steric hindrance and tends to bind with the calixarene cavity by supramolecular host–guest interactions which could further improve the enantioselectivity. In addition, electronic effects of the substituents on the aromatic ring showed a significant influence on
  • reaction, the question arises, which one is activated by the thiourea group through double hydrogen bonding. Based on the better enantioselectivity observed for product 9a over 9b–k, it was deduced that the binding of the nitroolefin with the calixarene cavity might be affected by the steric hindrance of
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Published 25 Jul 2018

Strong binding and fluorescence sensing of bisphosphonates by guanidinium-modified calix[5]arene

  • Jie Gao,
  • Zhe Zheng,
  • Lin Shi,
  • Si-Qi Wu,
  • Hongwei Sun and
  • Dong-Sheng Guo

Beilstein J. Org. Chem. 2018, 14, 1840–1845, doi:10.3762/bjoc.14.157

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  • BPs in buffer solution, and more importantly, in artificial urine. Calibration lines were therefore set up in untreated artificial urine, allowing for quantifying the concentrations of BPs in the biologically relevant low range. Keywords: bisphosphonate; calixarene; fluorescence sensing; macrocyclic
  • to their facial modification, Prof. Böhmer demonstrated calixarenes as having “(almost) unlimited possibilities” [17]. We have focused on molecular recognition and self-assembly of water-soluble calixarene derivatives for a long time [18][19][20][21][22][23][24], directed by exploring biomedical
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Published 19 Jul 2018

Synthesis and photophysical studies of a multivalent photoreactive RuII-calix[4]arene complex bearing RGD-containing cyclopentapeptides

  • Sofia Kajouj,
  • Lionel Marcelis,
  • Alice Mattiuzzi,
  • Adrien Grassin,
  • Damien Dufour,
  • Pierre Van Antwerpen,
  • Didier Boturyn,
  • Eric Defrancq,
  • Mathieu Surin,
  • Julien De Winter,
  • Pascal Gerbaux,
  • Ivan Jabin and
  • Cécile Moucheron

Beilstein J. Org. Chem. 2018, 14, 1758–1768, doi:10.3762/bjoc.14.150

Graphical Abstract
  • photophysical and photochemical characterizations of this Ru(II)–calixarene conjugate as well as the study of its photoreactivity in the presence of guanosine monophosphate have been achieved. The results show that the ruthenium complex should be able to perform efficiently its photoinduced cytotoxic activity
  • , once incorporated into targeted cancer cells thanks to the multivalent platform. Keywords: anticancer drug; calixarene; cell targeting; RGD peptide; ruthenium complex; Introduction Long-living luminescent polyazaaromatic ruthenium(II) complexes are intensively studied in a biological context, in
  • functionalized [54][55][56]. It is noteworthy that the calix[4]arene skeleton has been already exploited for the development of multivalent glyco- and peptidocalixarenes that can be recognized by cell-membrane receptors [57][58][59] and of calixarene derivatives able to specifically target membrane proteins
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Published 16 Jul 2018

Synthesis of diamido-bridged bis-pillar[5]arenes and tris-pillar[5]arenes for construction of unique [1]rotaxanes and bis-[1]rotaxanes

  • Ying Han,
  • Li-Ming Xu,
  • Cui-Yun Nie,
  • Shuo Jiang,
  • Jing Sun and
  • Chao-Guo Yan

Beilstein J. Org. Chem. 2018, 14, 1660–1667, doi:10.3762/bjoc.14.142

Graphical Abstract
  • ], cyclodextrin [24][25][26], calixarene [27][28][29] and pillararene have been successfully employed as the wheel subcomponent. Pillararenes are new star macrocyclic compounds with aromatic rings para-bridged by methylene units and have unique tubular shape rather than cone [30][31][32]. In recent years, an
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Published 04 Jul 2018

Hyper-reticulated calixarene polymers: a new example of entirely synthetic nanosponge materials

  • Alberto Spinella,
  • Marco Russo,
  • Antonella Di Vincenzo,
  • Delia Chillura Martino and
  • Paolo Lo Meo

Beilstein J. Org. Chem. 2018, 14, 1498–1507, doi:10.3762/bjoc.14.127

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  • , V.le delle Scienze ed. 17, 90128 Palermo, Italy 10.3762/bjoc.14.127 Abstract New calixarene-based nanosponges (CaNSs), i.e., hyper-reticulated polymers constituted by calixarene monomer units joined by means of bis(1,2,3-trialzolyl)alkyl linkers, were synthesized, characterized and subjected to
  • extend and possibly improve the supramolecular binding abilities of CyNSs, mixed cyclodextrin-calixarene co-polymers nanosponges (CyCaNSs) were recently synthesized by exploiting a classical “click-chemistry” approach, namely the CuAAC reaction (Cu-catalyzed azide–alkyne cycloaddition [28][29][30
  • synthetic NS, and testing the supramolecular binging abilities of a material exclusively constituted by calixarene units. For these purposes, in the present work we describe the synthesis, the characterization and a preliminary study on the adsorption abilities of a set of new calixarene nanosponges (CaNSs
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Published 20 Jun 2018

Recent applications of chiral calixarenes in asymmetric catalysis

  • Mustafa Durmaz,
  • Erkan Halay and
  • Selahattin Bozkurt

Beilstein J. Org. Chem. 2018, 14, 1389–1412, doi:10.3762/bjoc.14.117

Graphical Abstract
  • calixarene; organocatalyst; supramolecular catalyst; Introduction The catalysis of organic reactions by macrocyclic host compounds is a longstanding proposed application of supramolecular chemistry and utilizes the use of noncovalent interactions in catalytic systems to achieve higher reaction rates, more
  • ][14][15][16][17][18][19][20][21]. In general, chirality can be introduced into the calixarene platform either by incorporation of a chiral group or by asymmetric placement of achiral substituents, creating chirality associated with form. This is termed inherent chirality [22]. Although chiral
  • calixarenes prepared by these ways have been widely used in chiral recognition [23][24], the use of calixarenes in asymmetric catalysis is a new emerging area. This review attempts to illustrate a systematic overview of recent progress in asymmetric catalysis using different chiral calixarene derivatives
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Published 08 Jun 2018

Phosphodiester models for cleavage of nucleic acids

  • Satu Mikkola,
  • Tuomas Lönnberg and
  • Harri Lönnberg

Beilstein J. Org. Chem. 2018, 14, 803–837, doi:10.3762/bjoc.14.68

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  • by calix[4]arene derivatives 7 bearing the guanidine groups at the upper rim and O-(2-ethoxyethyl) groups at the lower rim [80]. The role of the latter groups was to improve solubility to hydroxylic solvents and to rigidify the calixarene system into the so-called cone conformation. HPNP (1) was used
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Published 10 Apr 2018

Carbohydrate inhibitors of cholera toxin

  • Vajinder Kumar and
  • W. Bruce Turnbull

Beilstein J. Org. Chem. 2018, 14, 484–498, doi:10.3762/bjoc.14.34

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  • -workers prepared a bivalent ligand 13 for CT by attaching two copies of GM1 mimic compound 3 to a calixarene (Figure 6) [47]. By measuring the affinity for CT by fluorescence titration, they found that the enhancement in affinity was 3800-fold as compared to the GM1 mimic, which is consistent with a
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Published 21 Feb 2018

From dipivaloylketene to tetraoxaadamantanes

  • Gert Kollenz and
  • Curt Wentrup

Beilstein J. Org. Chem. 2018, 14, 1–10, doi:10.3762/bjoc.14.1

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  • -butylcalix[6]arene moiety in 37 (Figure 3), which is obtained from the bisdioxine diacid dichloride 12 and calixarene [42]. The wider upper rim is clearly seen in the X-ray structure and the compound demonstrates a pronounced ability to extract Cs+ ions from water into chloroform by forming endohedral
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Published 02 Jan 2018

Binding abilities of polyaminocyclodextrins: polarimetric investigations and biological assays

  • Marco Russo,
  • Daniele La Corte,
  • Annalisa Pisciotta,
  • Serena Riela,
  • Rosa Alduina and
  • Paolo Lo Meo

Beilstein J. Org. Chem. 2017, 13, 2751–2763, doi:10.3762/bjoc.13.271

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  • synthesis of noble metal nanoparticles, and systems for the complexation and cell transfection of genetic material [17][18][19][20][21][22]. In particular, the complexation and transfection of polynucleotides also have been successfully accomplished by means of polycationic cyclodextrin or calixarene
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Published 18 Dec 2017

Binding abilities of a chiral calix[4]resorcinarene: a polarimetric investigation on a complex case of study

  • Marco Russo and
  • Paolo Lo Meo

Beilstein J. Org. Chem. 2017, 13, 2698–2709, doi:10.3762/bjoc.13.268

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  • complex formation. Interestingly, a fair upfield shift is observed also for the signals at 0.82 and 1.14 ppm (passing to 0.71 and 1.03 ppm, respectively) relevant to the propyl pendant groups linked at the 2, 8, 14 and 20 positions of the calixarene scaffold. Assuming for CAP the occurrence of an “all
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Published 15 Dec 2017
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