Imidazo ¬5,1-d tetrazin-1,2,3,5 one-derivatives and related products, processes for their preparation and composition containing said derivatives

Abstract From the Canadian patent

Tetrazine derivatives of the general formula: wherein R1 represents a (C3-C8)cycloalkyl group or, a (C1-C4)alkyl, (C2-C6)alkenyl or (C2-C6)alkynyl group each such alkyl, alkenyl or alkynyl group being unsubstituted or substituted by from 1 to 3 substituents selected from halogen atoms, (C1-C4)alkoxy -alkylthio, -alkylsulphinyl and -alkylsulphonyl groups and, optionally substituted phenyl groups A1 represents a, nitrogen atom or a group -CR3= wherein R3 represents hydrogen or a substituent R4 wherein R4 represents a halogen atom, or a (C1-C6)-alkyl or -alkenyl group which may carry up to 3 substituents selected from halogen atoms, optionally substituted phenyl groups and, (C1-C3)-alkoxy, …