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o-Carborane acts as a novel protective group of carbonyl compounds. The reaction of lithiocarborane 2, which was prepared in an essentially quantitative yield from o-carborane and n-butyllithium, with aldehydes or ketones 1 gave the corresponding addition products, o-carboranyl methanol derivatives 3, in high yields. Cleavage of o-carborane from 3 was carried out by treating 3 with catalytic amounts...
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