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Allenoxyborinates, generated via the reaction of dicyclohexylborane with α,β-acetylenic ketones, react in situ with excess starting ketone to afford stereodefined, functionalized, trisubstituted olefins in good yields. The allenoxyborinates, (RCH C C(R‘)OB( c -C 6 H 11 ) 2, can also be trapped by aldehydes and ketones when R‘ is a tert -butyl group.
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Yu et al. (1999) studied this question.
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