The cyclopropenyl cation

CONTENTS
I. The cyclopropenyl cation 557
II. Cyclopropenyl cations containing aryl and alkyl substituents 558
III. Reactions of cyclopropenyl cations with water, alcohols, and other nucleophilic reagents 558
IV. Aromatic substitutions involving the cations 560
V. Reactions of cyclopropenyl cations with compounds containing an active methylene group 561
VI. Methods of preparing cyclopropenyl cations 561