ChemistryThe article reports on a study in which Jiaobing Wang and Ben Feringa at the University of Groningen in the Netherlands have developed a catalyst that changes its configuration when exposed to light and that can generate one enantiomer or the other, depending on the position of the ...
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Discovery of new types of reactions is essential to organic chemistry because it expands the scope of accessible molecular scaffolds and can enable more economical syntheses of existing structures. In this context, the so-called multicomponent reactions,
catalysis protocol39and an Ir/Cu/organocatalyst multicatalysis protocol40for the enantioselective reductive alkynylation of amides (Fig.1b, c). However, the former (Fig.1b) is restricted to the transformation of tertiary benzamide derivatives39, and the latter (Fig.1c), while broader in scope,...
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It should be reported that only 7-arylpyrano[3,4-c]pyrazolo[3,4-f]quinolines were obtained in high regiochemistry [134]. Sign in to download full-size image Scheme 40. In order to optimize the reaction temperature and the amount of catalyst, the reaction of 2-hydroxynaphthalene-1,4-...
catalyst ligands, the aromatic C—H insertion giving rise to oxindoles 129 occurs in preference to aliphatic C—H insertion, addition to C=C and C≡C bonds, O – H insertion, and ylide formation, all of which are observed simply by switching to a carboxylate-based rhodium catalyst (94JO...
Here we show an easy curing reaction to prepare silicone elastomers, in which a platinum-catalyzed reaction of telechelic/multi-hydrosilane (Si–H) functional polydimethylsiloxane (PDMS) in the presence of oxygen and water leads to slow crosslinking. This curing chemistry allows versatile tailoring ...
The catalyst mainly consists of the simple elements (C, H, O and N) and possesses both acidic sites and basic ones which are distributed separately on the surface of OMCN-1. It was found that the acid-base sites catalyse cooperatively a one-pot deacetalization-Knoevenagel reaction with 100...