Oxidation of propenoidic phenols catalysed by N,N′-ethylenebis(salicylideneiminato)cobalt(II) [Cosalen]: reactivity and spectroscopic studies

✍ Scribed by Ezio Bolzacchini; Luisella Bocchio Chiavetto; Carmen Canevali; Franca Morazzoni; Marco Orlandi; Bruno Rindone

• Publisher: Elsevier Science
• Year: 1996
• Tongue: English
• Weight: 400 KB
• Volume: 112
• Category: Article
• ISSN: 1381-1169
• DOI: 10.1016/1381-1169(96)00110-0

✦ Synopsis

Three propenoidic phenols, E-methyl fernlate, E-Chydroxycinnamic acid methyl ester and E-3-chloro-4-hydroxycinnamic acid methyl ester, were oxidized with dioxygen, in the presence of N, N'-ethylenebis(salicylideneiminato)cobalt(II) [Cosalen]. The yields of conversion to oxidized products depended on the reaction solvent and on the substitnents on the phenyl ring. EPR and electronic investigations suggest that an organometallic radical acts as the intermediate active species.