Terminal acetylenes are amongst the most problematic substrates for alkynemetathesis because they tend to undergo rapid polymerization on contact with a metal alkylidyne. The molybdenum complex 3 endowed with triphenylsilanolate ligands, however, is capable of inducing surprisingly effective cross‐metathesis reactions of terminal alkyl acetylenes with propynyl(trimethyl)silane to give products of
作者:Birte Haberlag、Matthias Freytag、Constantin G. Daniliuc、Peter G. Jones、Matthias Tamm
DOI:10.1002/anie.201207772
日期:2012.12.21
Now even terminal: The 2,4,6‐trimethylbenzylidyne complexes [MesCMOC(CF3)2Me}3] (M=Mo, W) were synthesized from [Mo(CO)6] and [W(CO)6], respectively. The molybdenum complex is an efficient catalyst for the metathesis of internal and terminalalkynes and also for the ring‐closing metathesis of internal and terminal α,ω‐diynes at room temperature and low catalyst concentrations.
A Pd‐catalyzed multi‐component carbonylative difluoroalkylation/perfluoroalkylation through the alkynedifunctionalization process has been developed. Besides, new functional fluoropolymermaterials have been successfully synthesized. Owing to the presence of the fluorine element, the materials present excellent chemical resistance, high‐temperature‐resistance and outstanding hydrophobicity simultaneously
novel, four-component synthetic strategy to synthesize a series of β-difluoroalkyl unsaturated esters/amides with high regioslectivity is described. This Pd-catalyzed difluoroalkylation and carbonylation reaction can be carried out with simple starting materials. Through this protocol, two new C–C bonds (including one C–CF2 bond) and one C–O(N) bond are constructed simultaneously in a single step.
Regioselective synthesis of difluoroalkyl/perfluoroalkyl enones via Pd-catalyzed four-component carbonylative coupling reactions
作者:Qiang Wang、Lan Zheng、Yu-Tao He、Yong-Min Liang
DOI:10.1039/c7cc00259a
日期:——
The first example of Pd-catalyzed four-component carbonylative difluoroalkylation/perfluoroalkylation through the alkyne difunctionalization process is achieved. The reaction proceeds smoothly under mild conditions in the presence of 1 atm of CO...