sulfur; triethylamine in N,N-dimethyl-formamide T=50°C;

1: α-cyanoacetic acid methyl ester With octasulfur; triethylamine in N,N-dimethyl-formamide 0.166667 h; 2: pentanal in N,N-dimethyl-formamide T=20 - 50°C; 20 h;