ADDITION DES DIAZOMETHANE ET DIAZOETHANE ET AUX Α‐NITRO PARANITROCINNA‐MATES DE METHYLE ISOMERES GEOMETRIQUES ET a L'α‐NITRO PARANITRO‐BENZYLIDENE ACETONE Z. ETUDE PHYSICOCHIMIQUE ET THERMOLYSE DES PYRAZOLINES OBTENUES

Abstract

Cycloadditions of diazomethane and diazoethane on methyl a-nitro paranitrocinnamates E and 2 lead to corresponding pyrazol-1 -ines. Relations between stereochemistry (and conformation) of these latter and nature (and stereochemistry) of obtained compounds during their thermolysis are shown. After isomerisation in pyrazol-2-ines and removal of HN02, these pyrazol-1 -ines give pyrazoles, In comparison, reactions of a-nitro paranitrobenzylidene acetone 2 with CH2N2 and CH3CHN2 are also studied.L'addition des dipzles -1,3 aux d6-