CYCLOADDITION AND ELECTROCYCLIC REACTIONS OF VINYLKETENES, ALLENYLKETENES, AND ALKYNYLKETENES

摘要

Vinlketenes, like arylketenes, are highly reactive and readily enter into cycloaddition reactions, a characteristic mode of ketene reactivity. The reactivity of vinylketenes is attenuated by the presence of bulky groups and silyl substituents. The presence of a conjugated double bond in vinylketenes and allenylketenes, and a conjugated triple bond in alkynylketenes, allows a variety of additional cycloaddition pathways that are unavailable to simpler ketenes.