thionyl chloride in N,N-dimethyl acetamide T=15 - 35°C; 1.75 - 3.25 h;

potassium carbonate in N,N-dimethyl-formamide T=20°C; 18 h;

1: 1H-1,2,4-triazol With sodium methylate in methanol T=20 - 30°C; 0.25 h; 2: α,α,α',α'-tetramethyl-5-chloromethyl-1,3-benzene diacetonitrile in N,N-dimethyl acetamide T=15 - 55°C; 3 h; Product distribution / selectivity;

in acetonitrile