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Alkylation of deprotonated diphenylacetonitrile with halogeneacetones (Cl,Br,I) was studied in N,N-dimethylformamide (DMF). The differences in yields of the alkylation product, 4-oxo-2,2-diphenylvaleronitrile (I), are caused by variations in the haloacetones and solvents. The detailed structure of a new cyclization by-product, 3,3-diphenyl-5-methyl-5- acetonylpyrrolidin-2-one (II), in acetone co-solvent was established by X-ray analysis.

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Study of alkylation of deprotonated diphenylacetonitrile with halogeneacetones; X-ray crystal structure of 3,3-diphenyl-5-methyl-5-acetonylpyrrolidone – a new cyclization product in acetone co-solvent