A mechanistic study of the chromium(II)-mediated transformations of trichloromethyl alkyls and carbinols: evidence for carbene, carbyne, and carbenoid intermediates
摘要:
Using CrCl2 in THF at room temperature, trichloromethyl carbinols and trichloromethylalkanes are readily transformed to the highly reactive alpha-chlorocarbenes, carbynes and alpha-chloro-alpha-chromium(III) vinylidene carbenoids. A mechanistic study is carried out to determine the nature of the intermediates. (C) 2007 Elsevier Ltd. All rights reserved.
A mechanistic study of the chromium(II)-mediated transformations of trichloromethyl alkyls and carbinols: evidence for carbene, carbyne, and carbenoid intermediates
摘要:
Using CrCl2 in THF at room temperature, trichloromethyl carbinols and trichloromethylalkanes are readily transformed to the highly reactive alpha-chlorocarbenes, carbynes and alpha-chloro-alpha-chromium(III) vinylidene carbenoids. A mechanistic study is carried out to determine the nature of the intermediates. (C) 2007 Elsevier Ltd. All rights reserved.
Monodentate Phosphorus Ligand-Enabled General Palladium-Catalyzed Allylic C–H Alkylation of Terminal Alkenes
作者:Lian-Feng Fan、Pu-Sheng Wang、Liu-Zhu Gong
DOI:10.1021/acs.orglett.9b02325
日期:2019.9.6
enable the palladium-catalyzed allylic C-H alkylationreaction of terminal alkenes with a wide variety of carbon nucleophiles. Moreover, an asymmetricallylic C-H alkylation of terminal alkenes with pyrazol-5-ones has been established in the presence of chiral phosphoramidite ligand and chiral phosphoric acid as co-catalyst. Mechanisticstudies suggest that a ternary Pd(0) complex, coordinated with a