Easily Accessible and Highly Tunable Bisphosphine Ligands for Asymmetric Hydroformylation of Terminal and Internal Alkenes
作者:Kun Xu、Xin Zheng、Zhiyong Wang、Xumu Zhang
DOI:10.1002/chem.201304684
日期:2014.4.7
An efficient methodology for synthesizing a small library of easily tunable and sterically bulky ligands for asymmetric hydroformylation (AHF) has been reported. Five groups of alkene substrates have been tested with excellent conversions, moderate‐to‐excellent regio‐ and enantioselectivities. Among the best result of the reported literature, application of ligand 1 c in the highly selective AHF of
Tungsten hexachloride nanoparticles loaded on montmorillonite K-10: a novel solid acid catalyst in the synthesis of symmetrical and unsymmetrical azines
Montmorillonite K10clay as a highly active catalyst. A variety of aldehydes and ketones were efficiently converted to the corresponding azines using catalytic amounts of nanosized WCl6/Mont. K10 under mild conditions. The nanostructures of WCl6 loaded on Mont. K10 as solid acid catalyst have been prepared by solid dispersion method. The advantages of this catalyst are rapid completion of the reactions, simplicity
Synthesis of 1H-indazole: a combination of experimental and theoretical studies
作者:Xinzhi Chen、Shaodong Zhou、Chao Qian、Chaohong He
DOI:10.1007/s11164-012-0488-y
日期:2012.9
A new practical synthesis of 1H-indazole is presented. A previous mechanism for the cyclization step is proved to be nonfeasible and a hydrogen bond propelled mechanism is proposed. The new mechanism is suitable for similar cyclization, and a new reaction is predicted.
Abstract In the current protocol, amine functionalized montmorillonite K10 nanoclay (NH 2 -MMT) was applied to catalyze the formation of CN bonds in the synthesis of azines and 2-aminothiazoles at room temperature. In comparison with the current methods of CNbondformation, this approach displays specific advantages include atom economy, clean conversion, design for energy efficiency, the use of
作者:Alexey V. Shastin、Vasily N. Korotchenko、Valentine G. Nenajdenko、Elisabeth S. Balenkova
DOI:10.1055/s-2001-18055
日期:——
A new simple and efficient transformation of aromatic aldehydes to β,β-dibromostyrenes and arylbromoacetylenes is described. The olefination procedure was conducted under mild conditions and in good yields.