The condensation of dicarbonyl compounds with N-phenyltriazolinedione-dienone ylides derived from phenols: the facile preparation of novel quinone methides
Radikalreaktion an N-Heterocyclen. XIII. Oxidation cyclischer Hydrazoverbindungen mit 2,4,6-Tri-tert-butyl-phenoxyl und Folgereaktionen der Radikalkombinationsprodukte
摘要:
N-Heterocyclic compounds 1a, b containing the hydrazo StruCture were oxidized with 2.4,6-tri-tert-butyl-phenoxy radical (2). It was shown that the oxidation did not lead to the azo compounds 5a, b. but rather to radical combination products 6a. b of 2 via the intermediate hydrazyls 4a. b, The decomposition of adducts 6a, b was found to be similar to the reaction of radical combination products of aryl hydrazyls and CH-acidic compounds. The main reactions consisted of cleavage to starting radicals or elimination of isobutene forming the respective phenolic compounds 13a-c.