A NOVEL REACTION OF CYCLOALUMINATION OF OLEFINS AND ACETYLENES MEDIATED BY METALLOCOMPLEX CATALYSTS

Results obtained in the discovered by the authors catalytic cycloalumi nation reaction of unsaturated compounds in the presence of complex Ti - and Zr-containing catalysts are generalized. Cycloalumination of ole fins and acetylenes proceeds under the action of Ti and Zr complexes i n one stage to give novel classes of organoaluminum compounds (OAC): a lumacyclopentanes, alumacyclopropanes, alumacyclopropenes, 1,4-dialuma butanes, and 1,2-dialumaethylenes. Based on these cyclic and acyclic O AC, essentially new preparative synthetic methods were elaborated. Nov el reactions (beta-ethylation, beta-vinylation, reductive beta-ethylat ion, and reductive beta-vinylation) allow transforming olefins and ace tylenes into five-membered heterocycles, cyclopropanes, cyclobutanes, conjugated 1,3-dienes, primary alkyl iodides, 3-substituted alk-1-enes , and threo-2,3-disubstituted butane-1,4-diols under mild conditions i n high yields. The mechanisms of the presented reactions are discussed .