A facile one‐pot synthesis of novel substituted 1,2,3,4‐tetrahydropyrimidines Part 5 : Synthesis of bis[(l‐alkyl/aralkyl)‐5‐benzoyl‐6‐methylthio‐1,2,3,4‐tetrahydropyrimidinyl]alkane and benzene, bis[3‐phenyl‐7‐methyl‐4,5,6,7‐tetrahydropyrazolo[3,4‐ d ]‐pyrimidinyl]alkane and bis[1‐benzyl‐7‐phenyl‐1,2,3,4‐tetrahydro‐pyrazolo[1,5‐ a ]triazinyl]alkane and benzene

Bis‐1,2,3,4‐tetrahydropyrimidinylalkanes/benzenes 2a‐f have been synthesized by the reaction of N,S‐acetals with formaldehyde and diamines. Reaction of pyrazoles 3a and 3b with diamines and formaldehyde yield bis‐4,5,6,7‐tetrahydropyrazolo[3,4‐ d ]pyrimidinylalkanes 4a‐b and bis‐1,2,3,4‐tetrahydropyrazolo[1,5‐ a ]triazinylalkanes and benzene 5a‐c respectively in good yields.