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Electron-Deficient Carbocations. Direct Observation of α-Carbonylmethyl Cations by Laser Flash Photolysis. -The cations (I) and (II), directly substituted by electron-withdrawing groups, are observed for the first time during laser flash photolysis. Rate constants for nucleophilic quenching by alcohols and bromide ion are measured. The results indicate an increase in kinetic stability upon replacement of α-hydrogen by α-carbomethoxy. -(JOHNSTON, L. J.; KWONG, P.; SHELEMAY, A.; LEE-RUFF, E.; J. Am.