Unsymmetrical porphyrazines with annulated 1,2,5-thia(seleno)diazole and 3,6-diamyloxybenzene rings: synthesis, characterization and X-ray crystal structure of H 2{XN 2}{3,6-(OAm) 2Bz} 3Pz (X = S, Se)

Cyclotetramerization of a mixture of 3,4-dicyano-1,2,5-thiadiazole or 3,4-dicyano-1,2,5-selenodiazole with 3,6-diamyloxyphthalodinitrile gives new unsymmetrical porphyrazines with annulated 1,2,5-thia(seleno)diazole and 3,6-diamyloxybenzene rings; the structures of the 1:3 products H 2{XN 2}{3,6-(OAm) 2Bz} 3Pz (X = S, Se) has been elucidated by single-crystal X-ray diffraction.