An efficient metal-free and catalyst-free C–S/C–O bond-formation strategy: synthesis of pyrazole-conjugated thioamides and amides

• Shubham Sharma,
• Dharmender Singh,
• Sunit Kumar,
• Vaishali,
• Rahul Jamra,
• Naveen Banyal,
• Deepika,
• Chandi C. Malakar and
• Virender Singh

Beilstein J. Org. Chem. 2023, 19, 231–244, doi:10.3762/bjoc.19.22

• indicated the superiority of DMF over other solvents. Subsequently, we examined the effects of La(OTf)3 as a catalyst in combination with DMF as a solvent. However, the targeted prototype 1C was obtained only in 20% yield at 60 °C after 24 hours of reaction time (entries 11 and 12, Table 1). Next, ZnO

• nanoparticles were screened for the thioamidation of pyrazole-3-carbaldehyde. The desired thioamide-conjugated pyrazole 1C was afforded in 30% yield, as the starting substrates were not completely consumed even after 24 hours of reaction time (entry 13, Table 1). On the basis of the experimental results above

Heterogeneous photocatalysis in flow chemical reactors

• Christopher G. Thomson,
• Ai-Lan Lee and
• Filipe Vilela

Beilstein J. Org. Chem. 2020, 16, 1495–1549, doi:10.3762/bjoc.16.125

Synthesis of tripodal catecholates and their immobilization on zinc oxide nanoparticles

• Franziska Klitsche,
• Julian Ramcke,
• Julia Migenda,
• Andreas Hensel,
• Tobias Vossmeyer,
• Horst Weller,
• Silvia Gross and
• Wolfgang Maison

Beilstein J. Org. Chem. 2015, 11, 678–686, doi:10.3762/bjoc.11.77

• . Keywords: bifunctional anchors; catecholates; multivalency; poly(ethylene glycol); ZnO nanoparticles; Introduction An elegant approach to generate tailored materials and nanoparticles is the formation of molecular monolayers by chemisorption of bifunctional anchor molecules (Figure 1A) [1]. The

• exists in several morphologies such as nanowires, nanotubes, nanoparticles, nanoplatelets and nanowhiskers [24]. Colloidal ZnO nanoparticles are especially interesting because of their functional properties. Classical methods of colloid chemistry can be used for the preparation of colloidal suspensions

• of us established an easy and fast procedure to obtain nanocrystalline ZnO nanoparticles, which was applied to prepare the ZnO nanoparticles used in this work [30]. Immobilization of effector molecules on ZnO NPs has been accomplished with oxygen donors such as carboxylic acids. Bifunctional

Encapsulation of biocides by cyclodextrins: toward synergistic effects against pathogens

• Véronique Nardello-Rataj and
• Loïc Leclercq

Beilstein J. Org. Chem. 2014, 10, 2603–2622, doi:10.3762/bjoc.10.273

• were coated on crosslinked cotton fabric. The biocide efficiency against S. aureus and E. coli decreases in the following order: ZnO > Ag> TiO2. Moreover, the authors mentioned that the S-β-CD crosslinked ZnO nanoparticles coated fabric have the lowest production costs. This type of cellulose fabric

Synthesis of α-amino amidines through molecular iodine-catalyzed three-component coupling of isocyanides, aldehydes and amines

• Praveen Reddy Adiyala,
• D. Chandrasekhar,
• Jeevak Sopanrao Kapure,
• Chada Narsimha Reddy and
• Ram Awatar Maurya

Beilstein J. Org. Chem. 2014, 10, 2065–2070, doi:10.3762/bjoc.10.214

• ], ZnO nanoparticles [18] and BF3·OEt2 [19] were reported with varying degrees of success. All these reported methods for the preparation of α-amino amidines have their own limitations such as long reaction times, high catalyst loading and use of expensive and hazardous metal catalysts. Therefore, the

Synthesis and spectroscopic properties of 4-amino-1,8-naphthalimide derivatives involving the carboxylic group: a new molecular probe for ZnO nanoparticles with unusual fluorescence features

• Laura Bekere,
• David Gachet,
• Vladimir Lokshin,
• Wladimir Marine and
• Vladimir Khodorkovsky

Beilstein J. Org. Chem. 2013, 9, 1311–1318, doi:10.3762/bjoc.9.147

• (3H)-yl)benzoic acid (4) was found to be a sensitive molecular probe for ZnO nanoparticles. We investigated in detail one- and two-photon absorption properties of this fluorophore. In nonpolar solvents, the acid 4 absorbs at about 400 nm and fluoresces at 500 nm with a fluorescence lifetime of about 7

• modification of ZnO nanoparticles produced by femtosecond laser ablation was demonstrated to afford nanohybrid materials for biophotonic applications [13][14]. Results and Discussion Synthesis and characterization Yellow 4-amino-1,8-naphthalimides are usually synthesized in two steps. The first step is the

• electron-donating properties and weaker electron-accepting properties than ZnO [18]. Grafting to the surface of ZnO nanoparticles In order to investigate the behavior of acid 4 as a fluorescent molecular probe, preliminary experiments on grafting to the surface of ZnO nanoparticles (NPs) were carried out

Enhancement of efficiency in organic photovoltaic devices containing self-complementary hydrogen-bonding domains

• Rohan J. Kumar,
• Jegadesan Subbiah and
• Andrew B. Holmes

Beilstein J. Org. Chem. 2013, 9, 1102–1110, doi:10.3762/bjoc.9.122

• -assembly behaviour. The architecture of the devices was glass/ITO/poly(3,4-ethylenedioxythiophene)poly(styrenesulfonate)/active layer/ZnO nanoparticles/Al. Zinc oxide nanoparticles were used as an electron transport layer. The spin-coating velocity was varied to control film thickness. The average results