CP 2 TiCl 2 -catalyzed hydroalumination of internal alkynes: an access to ( Z )-olefins
作者:Arnaud Parenty、Jean-Marc Campagne
DOI:10.1016/s0040-4039(01)02402-9
日期:2002.2
The reduction of alkynols with LiAlH4 in diglyme is a long known process leading to the formation of (E)-alkenols. We have, by serendipity, found that, in the presence of a catalytic amount (10%) of Cp2TiCl2. the stereoselectivity of the reaction is reversed, leading to the selective formation of the (Z)-alkenols. The scope and limitations of this methodology and a postulated catalytic cycle are also discussed. (C) 2002 Elsevier Science Ltd. All rights reserved.