Synthesis of the s-triphenylcy clopropenyl cation

Abstract

Much of the interest in the field of non-benzenoid aromatic compounds centers around attempts to verify theoretical predictions that certain conjugated systems will be especially stable, or “aromatic,”while others will not. These predictions indicate that, in addition to well-known aromatic systems containing six electrons and more, a threemembered ring containing two electrons, the cyclopropenyl cation, should also be aromatic.1 We wish to report the first preparation of a derivative of this simplest aromatic ring. © 1957, American Chemical Society. All rights reserved.