Verfahren zur Herstellung von 2-Alkylpyridaziniumverbindungen

摘要

1334272 Pyridazinium salts BADISCHE ANILIN- & SODA-FABRIK AG 19 April 1971 [27 Jan 1970] 20397/71 Heading C2C Compounds of formulµ wherein R1, R2 and R3 are hydrogen, halogen, alkoxy, phenoxy, alkylthio, phenylthio, nitro, alkyl, aryl or a radical -NR4R5 in which R4 and R5 are hydrogen or aliphatic, cycloaliphatic, araliphatic or aromatic radicals or form together with the nitrogen atom a ring, and R2 and R3 may additionally be hydroxy groups or represent a fused ring or ring system, R6 is hydrogen or the same as R 7 , R 7 is a C 1-4 alkyl group and X is an anion, are prepared by mono- or di-alkylation of the appropriate N-unsubstituted-6- pyridazone with a dialkyl sulphate, an alkyl aryl sulphonate or a trialkyl oxonium fluoborate at 0‹ to 200‹ C. in an organic non-polar solvent, followed if desired by conversion to the betaine form by treatment with a proton acceptor. The products may be converted to the corresponding perchlorates.