Cyclobutane formation in the 2π + 2π cycloaddition of allyl and related cations to unactivated olefins. Evidence for the second step in the proposed mechanism of the ionic diels-alder reaction.
作者:Paul G. Gassman、Andrew C. Lottes
DOI:10.1016/0040-4039(92)88038-7
日期:1992.1
A variety of carbocation activated olefins have been shown to add to unactivated olefins in a 2π + 2π cycloaddition to yield cyclobutanes.
2π + 4π Cycloadditions of carbocation activated allenes
作者:Paul G. Gassman、Andrew C. Lottes
DOI:10.1016/0040-4039(91)80196-d
日期:1991.11
Boron trifluoride etherate opening of an allenic acetal produced an allene which was strongly activated by the alpha-carbocation to undergo 2-pi + 4-pi cycloaddition reactions.