Regioselective Methylenation and in situ Methanolation of Ketones Prone to C-C Double-Bond Isomerisation
作者:Kjell Undheim、Vidar Bjornstad
DOI:10.1055/s-2006-958950
日期:2007.1
An efficient methylenation reaction in isomer-labile ketones is described. The methylenation reaction is based on an improved method for the formation of bis(iodozincio)methane [CH 2 (ZnI) 2 ]. A subsequent in situ hydroboration-oxidation sequence provides the corresponding methanol derivatives in high yields without double-bond isomerisation.
stereoselective preparation of the appropriate spirane ligands. Substitution in the cyclopentadienylgroup in the ligand was effected by fulvene methodology. The zirconocenes were active precatalysts for the polymerisation of propene when activated with MAO. The structure of the parent zirconocene dichloride has been verified by X-ray crystal analysis.