Abstract
Treatment of alkenyldicyclohexylborane 5 with 1-lithio-3,4-pentadien-1-ynes derived from 10 followed by trimethyltin chloride and acetic acid furnished o-isotoluenes 13 in a single operation. The reaction proceeded through an initial formation of diene-allenes 11, which underwent facile electrocyclizations to produce 12 leading to o-isotoluenes 13.
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