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Search for "platinum" in Full Text gives 172 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

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  • terpyridine-bearing platinum–salphen known for their luminescence properties [41]. The closing process of the tweezers 12 was studied by NMR or UV–vis titrations with Zn2+ and other cations such as Pb2+, Fe2+, Cu2+, Eu3+, and Yb3+ indicating in all cases a 1:1 association model. The system can then be
  • . Vives and co-workers reported bis(platinum–salphen)terpyridine tweezers 20 that can intercalate in the U form extended aromatic guests such as coronene and perylene [52]. The opening of the tweezers with the addition of Zn2+ released the guest demonstrating an example of negative allosteric regulation
  • such Pt(II) dissymmetric tweezers could be controlled as aryl thioethers are more labile than alkyl thioethers. The addition of Cl− thus first breaks the Pt–SAr bond. Platinum-based dissymmetric tweezers were also synthetized using NHC thioether ligands that are more stable than the phosphine thioether
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Published 01 Mar 2024

Ligand effects, solvent cooperation, and large kinetic solvent deuterium isotope effects in gold(I)-catalyzed intramolecular alkene hydroamination

  • Ruichen Lan,
  • Brock Yager,
  • Yoonsun Jee,
  • Cynthia S. Day and
  • Amanda C. Jones

Beilstein J. Org. Chem. 2024, 20, 479–496, doi:10.3762/bjoc.20.43

Graphical Abstract
  • molecule of amine delivers a proton to the alkylgold intermediate (for protodeauration). In a platinum-catalyzed hydroamination, a protodemetalation pathway is supported by kinetics and reactivity studies on generated platinum alkyl intermediates [46]. In a palladium-catalyzed hydroamination, a
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Published 29 Feb 2024

(E,Z)-1,1,1,4,4,4-Hexafluorobut-2-enes: hydrofluoroolefins halogenation/dehydrohalogenation cascade to reach new fluorinated allene

  • Nataliia V. Kirij,
  • Andrey A. Filatov,
  • Yurii L. Yagupolskii,
  • Sheng Peng and
  • Lee Sprague

Beilstein J. Org. Chem. 2024, 20, 452–459, doi:10.3762/bjoc.20.40

Graphical Abstract
  • defluorosilylation product was obtained [11]. In a related study of the hydrosilylation reaction of olefins 1a,b, it was shown that, depending on the catalyst used, platinum or rhodium compounds, along with the products of the addition of silane to the double bond, the elimination of the fluorine atom occurs with
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Published 27 Feb 2024

Synthesis of π-conjugated polycyclic compounds by late-stage extrusion of chalcogen fragments

  • Aissam Okba,
  • Pablo Simón Marqués,
  • Kyohei Matsuo,
  • Naoki Aratani,
  • Hiroko Yamada,
  • Gwénaël Rapenne and
  • Claire Kammerer

Beilstein J. Org. Chem. 2024, 20, 287–305, doi:10.3762/bjoc.20.30

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  • naphthyl substituents carrying each an alkyne moiety on the ortho position. Ring expansion of both thiophene units in 19 was then triggered by platinum catalysis to generate the corresponding thiopyrans, and finally the bromine atoms located on the latter rings were exploited for the ring closure of the
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Published 15 Feb 2024

Multi-redox indenofluorene chromophores incorporating dithiafulvene donor and ene/enediyne acceptor units

  • Christina Schøttler,
  • Kasper Lund-Rasmussen,
  • Line Broløs,
  • Philip Vinterberg,
  • Ema Bazikova,
  • Viktor B. R. Pedersen and
  • Mogens Brøndsted Nielsen

Beilstein J. Org. Chem. 2024, 20, 59–73, doi:10.3762/bjoc.20.8

Graphical Abstract
  • platinum disk (diameter = 1.6 mm) or a glassy carbon disk (3 mm) was used as the working electrode. The reference electrode was separated from the solution containing the substrate by a ceramic frit. Measured potentials were referenced to ferrocene/ferrocenium (Fc/Fc+) redox couple, measured before and
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Published 15 Jan 2024

Aromatic systems with two and three pyridine-2,6-dicarbazolyl-3,5-dicarbonitrile fragments as electron-transporting organic semiconductors exhibiting long-lived emissions

  • Karolis Leitonas,
  • Brigita Vigante,
  • Dmytro Volyniuk,
  • Audrius Bucinskas,
  • Pavels Dimitrijevs,
  • Sindija Lapcinska,
  • Pavel Arsenyan and
  • Juozas Vidas Grazulevicius

Beilstein J. Org. Chem. 2023, 19, 1867–1880, doi:10.3762/bjoc.19.139

Graphical Abstract
  • as a quasireference electrode, while a platinum wire served as a counter electrode to facilitate the redox reactions. For calibration purposes, the potentials were standardized using the standard ferrocene/ferrocenium (Fc/Fc+) redox system, a well-known and widely used reference for establishing
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Published 12 Dec 2023

Organic thermally activated delayed fluorescence material with strained benzoguanidine donor

  • Alexander C. Brannan,
  • Elvie F. P. Beaumont,
  • Nguyen Le Phuoc,
  • George F. S. Whitehead,
  • Mikko Linnolahti and
  • Alexander S. Romanov

Beilstein J. Org. Chem. 2023, 19, 1289–1298, doi:10.3762/bjoc.19.95

Graphical Abstract
  • compete with classic phosphorescent emitters that employ scarce metals such as iridium and platinum [7][8][9]. Since its first report in 2012 by Uoyama et al., 1,2,3,5-tetrakis(carbazol-9-yl)-4,6-dicyanobenzene (4CzIPN) has been a benchmark TADF emitter due to its high quantum yields and excellent
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Published 07 Sep 2023
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  • NADH-analogues are the subject of most studies for recycling sacrificial donors. NADH has been electrochemically recycled but a careful control of pH is required to prevent dimerization reactions [44][45]. For example, Glusac and co-workers recycled BIH and acridine analogues using platinum electrodes
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Published 08 Aug 2023

Photoredox catalysis harvesting multiple photon or electrochemical energies

  • Mattia Lepori,
  • Simon Schmid and
  • Joshua P. Barham

Beilstein J. Org. Chem. 2023, 19, 1055–1145, doi:10.3762/bjoc.19.81

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Published 28 Jul 2023

The effect of dark states on the intersystem crossing and thermally activated delayed fluorescence of naphthalimide-phenothiazine dyads

  • Liyuan Cao,
  • Xi Liu,
  • Xue Zhang,
  • Jianzhang Zhao,
  • Fabiao Yu and
  • Yan Wan

Beilstein J. Org. Chem. 2023, 19, 1028–1046, doi:10.3762/bjoc.19.79

Graphical Abstract
  • -purged saturated solutions containing 0.10 M Bu4NPF6 as a supporting electrolyte, a platinum electrode as counter electrode, a glassy carbon electrode as working electrode, and the Ag/AgNO3 (0.1 M in ACN) couple as the reference electrode. Ferrocenium/ferrocene (Fc+/Fc) redox couple was used as an
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Published 19 Jul 2023

Synthesis, structure, and properties of switchable cross-conjugated 1,4-diaryl-1,3-butadiynes based on 1,8-bis(dimethylamino)naphthalene

  • Semyon V. Tsybulin,
  • Ekaterina A. Filatova,
  • Alexander F. Pozharskii,
  • Valery A. Ozeryanskii and
  • Anna V. Gulevskaya

Beilstein J. Org. Chem. 2023, 19, 674–686, doi:10.3762/bjoc.19.49

Graphical Abstract
  • to its analogs with electron-withdrawing substituents. The redox properties of oligomers 5 were evaluated by cyclic voltammetry (CV) in dichloromethane solution containing 0.1 M n-Bu4NPF6 in the standard three-electrode electrochemical cell: glassy carbon working electrode, platinum auxiliary
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Published 15 May 2023

A new oxidatively stable ligand for the chiral functionalization of amino acids in Ni(II)–Schiff base complexes

  • Alena V. Dmitrieva,
  • Oleg A. Levitskiy,
  • Yuri K. Grishin and
  • Tatiana V. Magdesieva

Beilstein J. Org. Chem. 2023, 19, 566–574, doi:10.3762/bjoc.19.41

Graphical Abstract
  • voltammetry (CV) in acetonitrile with 0.1 M Bu4NBF4 as a supporting electrolyte. A platinum disk was used as a working electrode. Formal potential values are given in Table 4. As could be expected, the potential values are rather close to that for the corresponding derivatives of the original ligand L1 [37
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Published 27 Apr 2023

Discrimination of β-cyclodextrin/hazelnut (Corylus avellana L.) oil/flavonoid glycoside and flavonolignan ternary complexes by Fourier-transform infrared spectroscopy coupled with principal component analysis

  • Nicoleta G. Hădărugă,
  • Gabriela Popescu,
  • Dina Gligor (Pane),
  • Cristina L. Mitroi,
  • Sorin M. Stanciu and
  • Daniel Ioan Hădărugă

Beilstein J. Org. Chem. 2023, 19, 380–398, doi:10.3762/bjoc.19.30

Graphical Abstract
  • (Bruker Optik GmbH, Ettlingen, Germany), equipped with an ATR (single-reflection Platinum diamond attenuated total reflectance) system. The following FTIR conditions were set up: acquisition range 4000–400 cm−1, resolution 4 cm−1, number of scans 128, sample mass 10–20 mg, spectrum range for the DLaTGS
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Published 28 Mar 2023

Two-step continuous-flow synthesis of 6-membered cyclic iodonium salts via anodic oxidation

  • Julian Spils,
  • Thomas Wirth and
  • Boris J. Nachtsheim

Beilstein J. Org. Chem. 2023, 19, 27–32, doi:10.3762/bjoc.19.2

Graphical Abstract
  • oxidation of iodoarenes to form DIS by Wirth et al. (Scheme 1B) [39]. Herein, established conditions for synthesizing DIS were transferred into flow chemistry utilizing a model flow reactor with two platinum electrodes. Other recent examples include the generation of five-membered CDIS utilizing fluorinated
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Published 03 Jan 2023

Naphthalimide-phenothiazine dyads: effect of conformational flexibility and matching of the energy of the charge-transfer state and the localized triplet excited state on the thermally activated delayed fluorescence

  • Kaiyue Ye,
  • Liyuan Cao,
  • Davita M. E. van Raamsdonk,
  • Zhijia Wang,
  • Jianzhang Zhao,
  • Daniel Escudero and
  • Denis Jacquemin

Beilstein J. Org. Chem. 2022, 18, 1435–1453, doi:10.3762/bjoc.18.149

Graphical Abstract
  • electrochemical workstation (CHI instruments, Inc., Shanghai, China) using N2-purged saturated solutions (NI-PTZ, NI-PTZ2, NI-Ph-PTZ, and NI-PhMe2-PTZ in deaerated dichloromethane, NI-PTZ-O in deaerated acetonitrile) containing 0.10 M Bu4NPF6 as a supporting electrolyte, a platinum electrode as counter electrode
  • with gauze platinum as working electrode, a platinum wire as counter electrode, and Ag/AgNO3 as reference electrode. Bu4N[PF6] was used as the supporting electrolyte. The potential was regulated with a CHI610D electrochemical workstation (CHI instruments, Inc., Shanghai, China), and the spectra were
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Published 11 Oct 2022

Electrochemical formal homocoupling of sec-alcohols

  • Kosuke Yamamoto,
  • Kazuhisa Arita,
  • Masashi Shiota,
  • Masami Kuriyama and
  • Osamu Onomura

Beilstein J. Org. Chem. 2022, 18, 1062–1069, doi:10.3762/bjoc.18.108

Graphical Abstract
  • -1,2-diols through the formal homocoupling of sec-alcohols using platinum electrodes in an undivided cell (Scheme 1c). Results and Discussion We commenced the optimization study for the electrochemical formal homocoupling of sec-alcohols by using 1-phenylethanol (1a) as a model substrate. The results
  • are summarized in Table 1. The electrolysis was carried out using an undivided cell in the presence of Et4NBr as an electrolyte with a mixed solvent of MeCN and H2O under air atmosphere. When 4 F/mol of electricity was passed through the reaction mixture using two platinum electrodes at 0 ºC, the
  • . The present reaction smoothly proceeded in a simple undivided cell with platinum electrodes under constant current conditions, affording pinacol-type products in moderate to good yields with good to high diastereoselectivities. The successful large-scale experiment showed the potential synthetic
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Published 22 Aug 2022

Electrochemical vicinal oxyazidation of α-arylvinyl acetates

  • Yi-Lun Li,
  • Zhaojiang Shi,
  • Tao Shen and
  • Ke-Yin Ye

Beilstein J. Org. Chem. 2022, 18, 1026–1031, doi:10.3762/bjoc.18.103

Graphical Abstract
  • relevant heterocycles. From vinyl acetates to α-azidoketones. Substrate scope. Reaction conditions: α-arylvinyl acetate (0.5 mmol), TMSN3 (1.0 mmol), n-Bu4NPF6 (0.5 mmol), H2O (2.5 mmol), MeCN (5 mL), carbon cloth anode, platinum cathode, undivided cell, Ecell = 2.3 V, room temperature, 6 h. a2 h
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Published 12 Aug 2022

Electroreductive coupling of 2-acylbenzoates with α,β-unsaturated carbonyl compounds: density functional theory study on product selectivity

  • Naoki Kise and
  • Toshihiko Sakurai

Beilstein J. Org. Chem. 2022, 18, 956–962, doi:10.3762/bjoc.18.95

Graphical Abstract
  • ) was placed in the cathodic chamber of a divided cell (40 mL beaker, 3 cm diameter, 6 cm height) equipped with a platinum cathode (5 × 5 cm2), a platinum anode (2 × 1 cm2), and a ceramic cylindrical diaphragm (1.5 cm diameter). A 0.3 M solution of Bu4NClO4 in DMF (4 mL) was placed in the anodic chamber
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Published 02 Aug 2022

Introducing a new 7-ring fused diindenone-dithieno[3,2-b:2',3'-d]thiophene unit as a promising component for organic semiconductor materials

  • Valentin H. K. Fell,
  • Joseph Cameron,
  • Alexander L. Kanibolotsky,
  • Eman J. Hussien and
  • Peter J. Skabara

Beilstein J. Org. Chem. 2022, 18, 944–955, doi:10.3762/bjoc.18.94

Graphical Abstract
  • Cyclic voltammetry (CV) was used to estimate the ionisation energy (IE) and the electron affinity (EA) of the title compound (Figure 9) [63]. CV was measured in a 10−4 M CH2Cl2 solution with 0.1 M tetra-n-butylammonium hexafluorophosphate (TBAPF6) added as electrolyte. A platinum disk electrode, a Pt
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Published 01 Aug 2022

Cathodic generation of reactive (phenylthio)difluoromethyl species and its reactions: mechanistic aspects and synthetic applications

  • Sadanobu Iwase,
  • Shinsuke Inagi and
  • Toshio Fuchigami

Beilstein J. Org. Chem. 2022, 18, 872–880, doi:10.3762/bjoc.18.88

Graphical Abstract
  • bromodifluoromethyl phenyl sulfide (1) was measured by cyclic voltammetry in an anhydrous acetonitrile (MeCN) solution containing Bu4NClO4 (0.1 M) using a platinum electrode. One irreversible reduction peak was observed at −2.4 V vs SSCE at a scan rate of 100 mV/s. Even at a much higher scan rate of 500 mV/s, the
  • cathodic reduction of 1 at a platinum cathode in Bu4NClO4/MeCN. Notably, when 1.3 F/mol were passed, starting compound 1 was consumed completely. As shown in Scheme 4, difluoromethyl phenyl sulfide (2) was mainly formed as well as bis(phenylthio)difluoromethane (3) as a minor product. From these results
  • the radical trapping reagent, the expected radical adduct 4 was formed in reasonable yield of ca. 30% (Table 1, run 1). A platinum cathode is more suitable for the formation of adduct 4 compared to a glassy carbon cathode (Table 1, run 2). Dolbier et al. reported that electron-poor perfluoroalkyl
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Published 20 Jul 2022

Synthesis of odorants in flow and their applications in perfumery

  • Merlin Kleoff,
  • Paul Kiler and
  • Philipp Heretsch

Beilstein J. Org. Chem. 2022, 18, 754–768, doi:10.3762/bjoc.18.76

Graphical Abstract
  • solution of (R)-carvone (25) in toluene is merged with a stream of hydrogen and the resulting segmented flow is passed through a column reactor containing a dimethylpolysilane-modified platinum catalyst (DMPS-Pt, 26), immobilized on carbon/calcium phosphate. At a temperature of 25 °C using 1.4 equivalents
  • ) via selective hydrogenation to enone 27, condensation to hydrazone 28 and subsequent Shapiro reaction. DMPS = dimethylpolysilane-modified platinum catalyst; Ts = tosyl. Selective hydrogenation of alkyne 31 to “leaf alcohol” 32 employing a solid-supported palladium catalyst. A) Synthesis of jasmonal
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Published 27 Jun 2022

Heteroleptic metallosupramolecular aggregates/complexation for supramolecular catalysis

  • Prodip Howlader and
  • Michael Schmittel

Beilstein J. Org. Chem. 2022, 18, 597–630, doi:10.3762/bjoc.18.62

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  • ]. Using addition and removal of chloride, the Mirkin group reversibly and quantitatively toggled the platinum(II)-based switch 1262+ between a homo- and heteroligated form (Figure 29) [132]. In the closed platinum(II) complex 1262+, the urea units were available for activation of butenone (127) by
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Published 27 May 2022

Menadione: a platform and a target to valuable compounds synthesis

  • Acácio S. de Souza,
  • Ruan Carlos B. Ribeiro,
  • Dora C. S. Costa,
  • Fernanda P. Pauli,
  • David R. Pinho,
  • Matheus G. de Moraes,
  • Fernando de C. da Silva,
  • Luana da S. M. Forezi and
  • Vitor F. Ferreira

Beilstein J. Org. Chem. 2022, 18, 381–419, doi:10.3762/bjoc.18.43

Graphical Abstract
  • electrolysis (Scheme 10). For this approach, two smooth platinum foil electrodes placed 1 cm apart in the upper aqueous phase were electrolyzed galvanostatically (30 mA/cm2). Additionally, a NaBr solution acidified with H2SO4 was used as electrolyte. The voltage during electrolysis was 2.1 V and when the
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Published 11 Apr 2022

Synthesis of piperidine and pyrrolidine derivatives by electroreductive cyclization of imine with terminal dihaloalkanes in a flow microreactor

  • Yuki Naito,
  • Naoki Shida and
  • Mahito Atobe

Beilstein J. Org. Chem. 2022, 18, 350–359, doi:10.3762/bjoc.18.39

Graphical Abstract
  • of the cathode material on the yield of 3a using three different cathode materials: platinum (Pt), glassy carbon (GC), and silver (Ag). As shown in Table 1, the yield of 3a was higher using GC than that of the other cathode materials. The yield of the hydromonomeric product 4 was also highest when GC
  • microreactor was constructed with a platinum plate (3 × 3 cm) and cathode plate (3 × 3 cm) (Supporting Information File 1, Figure S1). A spacer (double faced adhesive type with thicknesses of 20, 40, or 80 μm) was used to leave a rectangular channel exposed (1 × 3 cm), and the two electrodes were simply
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Published 29 Mar 2022

Photophysical, photostability, and ROS generation properties of new trifluoromethylated quinoline-phenol Schiff bases

  • Inaiá O. Rocha,
  • Yuri G. Kappenberg,
  • Wilian C. Rosa,
  • Clarissa P. Frizzo,
  • Nilo Zanatta,
  • Marcos A. P. Martins,
  • Isadora Tisoco,
  • Bernardo A. Iglesias and
  • Helio G. Bonacorso

Beilstein J. Org. Chem. 2021, 17, 2799–2811, doi:10.3762/bjoc.17.191

Graphical Abstract
  • VERTEX 70 spectrophotometer with Platinum ATR accessory (diamond crystal) in the 4000–400 cm−1 region. High-resolution mass spectra (HRMS) were obtained for all compounds on a hybrid high-resolution and high-accuracy (5 μL/L) micro Q-TOF mass spectrometer (Bruker Scientific®, Billerica, MA, USA) at the
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Published 01 Dec 2021
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