Allylation and Vinylation of Aryl Radicals Generated from Diazonium Salts
作者:Markus R. Heinrich、Olga Blank、Daniela Ullrich、Marcel Kirschstein
DOI:10.1021/jo701717k
日期:2007.12.1
Allylation and vinylation of arylradicals generated from aryl diazonium salts provides rapid and efficient access to chlorinated and brominated derivatives of styrene and allylbenzene. Allyl chlorides were found to be better substrates than bromides due to decreased halogen transfer. Donor- and acceptor-substituted diazonium salts are well tolerated. The products represent important precursors for
Generation of allylic titanocene derivatives from vinyl halides and a Cp2TiCl2Me3Al reagent system
作者:Yuji Hanzawa、Noboru Kowase、Takeo Taguchi
DOI:10.1016/s0040-4039(97)10612-8
日期:1998.2
The reagent prepared in advance by stirring a mixture of a Cp2TiCl2Me3Al reagent system in the ratio of 1:4 in toluene for 3 days is found to be effective in generating allylic titanocene on treatment with vinyl halides in THF.
Coupling of aryl Grignard reagents by electron transfer to 2,3-dichloropropene
作者:Jya-Wei Cheng、Fen-Tair Luo
DOI:10.1016/s0040-4039(00)80280-4
日期:——
A general synthesis of symmetrical biaryls in good to excellent yields via homo-coupling of arylGrignardreagents in the presence of 2,3- dichloropropene is described.
A Cp2TiCl2-Me3Al (1 : 4) reagent system: An efficient reagent for generation of allylic titanocene derivatives from vinyl halides, vinyl ethers and carboxylic esters
Cp2TiCl2-Me3Al (a 1 : 4 ratio) reagent system in toluene for 3 days is found to be effective in generating allylic titanocene on treatment with vinyl halides, vinylethers and carboxylic esters in THF. The process for the generation of an allylic titanocene species from these starting materials was suggested to proceed through a formation of titanacyclobutane and the subsequent elimination of the halogen