The trishomocyclopropeny1 cation has been prepared for the first time and is shown to be a remarkably stable, highly charge-delocalized species. The large J 1 3 C -H 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.On a prepare le cation trishornocycloprop~nyle pour la premiere fois et dCmontrC que c'est une espece d'une stabilite remarquable et oh la charge est hautement delocalisee. Le fait que la valeur de J , 3 c -H soit grande pour les carbones portant la charge positive, de m&mk que le grand deplacernent chirnique vers les champs ClevCs de ces carbones, ainsi que ]'absence d e transfert d'hydrure sont tous significatifs et en accord avec la formulation de 1 dans les limites de I'CcheIle de temps de la r.m.n.[Traduit par le journal]Can. J. Chem., 52,855 (1974)
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