Carbonium Ions. XVIII. Cyclizations of Pentadienyl and Heptatrienyl Cations
作者:N. C. Deno、Charles U. Pittman、John O. Turner
DOI:10.1021/ja01088a012
日期:1965.5
THE SYNTHESIS AND REACTIONS OF DIVINYL CARBONIUM IONS
作者:T. S. Sorensen
DOI:10.1139/v64-410
日期:1964.12.1
A number of alkyl-substituted trienes have been protonated. In some cases, the existence of divinyl carboniumions can be shown, while in others, a cyclization reaction leading to, cyclopentenyl carboniumions takes place so rapidly that the presumed initially formed divinyl carbonium is never observed. Steric arguments are invoked to explain these differences. Complete n.m.r. and ultraviolet spectral