A 13C NMR STUDY ON THE TRIS(PHENYLETHYNYL)METHYL AND α,α-BIS(PHENYLETHYNYL)BENZYL CATIONS: THE TRIS- AND BIS-ETHYNOLOGUES OF THE TRIPHENYL CATION
Comparison of the 13C NMR data of the title cations with those of the triphenylmethyl cation and its monoethynologue indicates the increasing contribution of the allenyl-type resonance structure upon consecutive introduction of the ethynyl comp