The solid??state michael addition of 3??methyl??1??phenyl??5??pyrazolone

XL Li, YM Wang, B Tian, T Matsuura…

Index: Li, Xiao-Liu; Wang, Yong-Mei; Tian, Bing; Matsuura, Teruo; Meng, Ji-Ben Journal of Heterocyclic Chemistry, 1998 , vol. 35, # 1 p. 129 - 134

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Citation Number: 46

Abstract

Abstract A novel solid-state Michael addition between pyrazolone 1 and 4- arylidenepyrazolones 2 at ambient temperature produced Michael adducts, 4, 4′- arylidenebis (3-methyl-1-phenyl-5-pyrazolones) 3. Pyrazolones 3 formed salts 4 with Cu 2+ in solution, indicating the enolic structure of the pyrazolone rings. The reactivity of 2 with 1 is discussed in terms of the electronic and steric effects of the substituent on the arylidene ...