Di-í-butylcyclopropenone (1) has been synthesized and its chemistry investigated. Pyrolysis or photolysis afforded di-i-butylacetylene. Condensation of 1 with malononitrile and ethyl cyanoacetate generated the triafulvenes 2 and 3, respectively. Substituted dw-butylcyclopropenyl cations 5 including the tri-i-butylcyclopropenyl cation (5a) have been prepared via the reaction of 1 with organolithium reagents. The pTfRvalues of these cations have been determined by potentiometric titration and are discussed. Some reactions of cation 5a 1611 (1959).(6) (a) The method employed was essentially that of Breslow: see

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J 5 . 3 = 0 . 7 4.59 J i . 8 = 6 . 5 J I ,~ = 2 . 0 Ji,, = 1 . 5 J 3 , i = 2 . 0 J 3 , 5 = 0 . 7 6.49 J s . 8 = 8 . 0 J 8 , i = 6 . 5 J8.j = 1 , s 6.84Jo.8 = 8.0 J 0 . s = 6.2 J 9 . i = 1 . 5

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