Synthesis and transformations of metallocycles

A novel regio- and stereoselective method for synthesizingthreo-2,3-disubstituted 1,4-dialumobutanes from -olefins and haloalanes (Et₂AlCl, (Et₂N)₂AlCl, (EtO)₂AlCl, Bu _i ² AlCl) with the participation of catalytic amounts of Cp₂ZrCl₂ or ZrCl₄ in the presence of magnesium metal was developed. The products of hydrolysis and deuterolysis of the dialuminum compounds obtained have athreo-configuration. The selective transformations of 1,4-dialumobutanes totrans-3,4-disubstituted tetrahydrothiophenes,trans-1,2-disubstituted cyclobutanes, and disubstituted ,-dienes were found to be possible.For Part 15, see Ref. 1.Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 8, pp. 1561–1567, August, 1995.This work was carried out with financial support from the Russian Foundation for Basic Research (Project No. 93-03-04136).