A new vinyloxyborane derivative, Id, was found to be formed in reaction of phenyl di-n- butylthioboronite (II) with methyl vinyl ketone. In order to explore its utilization in organic synthesis, the reactivity of Id and other known vinyloxyboranes was variously examined. Id and Ie gave β-hydroxyketones (IVa–c, Va–d) in fairly good yields when they were allowed to react with carbonyl compounds. The reaction of Ia′ and Ib with nitriles, followed by ...
