ZrCp2(isoprene) reacts with aliphatic aldehydes, ketones or nitriles regioselectively on C1-carbon of the isoprene moiety to give novel 2-oxa- or 2-aza-metallacycles which release alcohols or ketones respectively on hydrolysis. In contrast, ZrCH3(η1-methylallyl)Cp2, Ti(η3-methylallyl)Cp2, and [MgCH2C(CH3)=CHCH2]n reacted with acetone on the C3-carbon of the methylallyl or the isoprene unit.
Cp2TiCl2-catalyzed grignard exchange reactions with 1,3-dienes or styrenes. Preparation of allylic and α-arylethyl grignard reagents by a convenient and quantitative method
作者:Fumie Sato、Hiroaki Ishikawa、Masao Sato
DOI:10.1016/s0040-4039(01)85474-5
日期:1980.1
The addition of a catalytic amount of Cp2TiCl2 to an ether solution of propylmagnesium bromide and 1,3-dienes brings about an exchange reaction forming allylicGrignard reagents.