Base-catalyzed polymerization of P2P

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I found it:

The Alkylation of Phenylacetones
BY EVERETT M. SCHULTZ, JOHN B. BICKING, SALLY MICKEY AND FRANK S. CROSSLEY
J.A.C.S. vol. 75, pp.1072-1074 (1953)

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The synthesis of alkylated derivatives of phenylacetone and diphenylacetone was investigated. In the presence of powdered sodium hydroxide, phenylacetone reacts with normal and selected branched-chain lower-alkyl halides to produce 1-alkyl-1-phenylacetones in good yields. 1-Alkyl-1,1-diphenylacetones have been prepared by treating 1-bromo-1-alkyl-1-phenylacetones with benzene and anhydrous aluminum chloride or, in some cases, by direct alkylation of diphenylacetone with an alkyl halide in the presence of potassium t-butoxide or sodium hydroxide.