What are the best and simple methods available for the substitution of alkyl halide by active methylene group?

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Vijay V

Thanks michael and saikat for the suggestions. I had referered to that organic synthesis paper and tried PTC reaction and other simple reaction with just the base and two reactants in polar solvents. One common observation with all the reactions was, as soon as I add the base to the solution containing benzyl cyanide the solution is turning purple. I have no idea whats happening.

Thanks Saiket those are articles were really helpful. I could see the alkylated product forming but getting more of disubstituted product than mono. Taking 2 equiv. of Phenylacetonitrile didn't help much.