The Trishomocyclopropenyl Cation. I. Direct Observation

Abstract

The trishomocyclopropenyl cation has been prepared for the first time and is shown to be a remarkably stable, highly charge-delocalized species. The large [Formula: see text] value associated with the carbons formally carrying the positive charge, the high-field chemical shift of these carbons, and the absence of hydride shift, all are significant and are consistent with the formulation of 1 subject to the limit of the n.m.r. time scale.