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[reaction: see text]. A new group-selective reaction is described, that is, the hydroalumination of bis-alkynyl alcohols armed with an adjacent stereogenic center, giving stereo-defined tert-alcohols of potential utility in natural product synthesis.

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reactions of organo-metal compounds reactions of organo-metal compounds O 0350 -123Novel Migrating Group in 1,2-Anionotropic Reactions:Cobalt Complexation Facilitates 1,2-Shift of Alkynyl Groups.-It is shown that the oxide-induced 1,2-shift of complexes (III) occurs readily to ketones (IV), whereas the clean alkynyl compound (I) does not give (V). When AlMe3 is used as a promotor the reaction proceeds at lower temperature, but the migration is shown to depend on the alkynyl substituent. Some further examples demonstrate the stereospecificity of the 1,2-shift. -(NAGASAWA, T.; TAYA, K.; KITAMURA, M.; SUZUKI, K.; J.