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New alkenylcobalt(III) complexes from oxidative denitrogenation of hydrazones by cobalt Schiff base complex-dioxygen system

✍ Scribed by Akira Nishinaga; Shigekazu Yamazaki; Teruo Matsuura

Book ID: 104242549
Publisher: Elsevier Science
Year: 1987
Tongue: French
Weight: 273 KB
Volume: 28
Category: Article
ISSN: 0040-4039
DOI: 10.1016/s0040-4039(01)91360-7

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✦ Synopsis

Oxidation of hydrazones of aliphatic ketones by a Co(salen)dioxygen system in dichloromethane results in oxidative denitrogenation of the hydrazones to give new l-alkenylcobalt(I11) complexes. Treatment of the alkenyl complexes with sodium borohydride gives the corresponding cis-olefins. Oxygenation reactions with cobalt(I1) Schiff base complexes are topics of investigations on models for biological oxygenations 1 and on organic functionalization reactions. 2 Recently, we have reported that five coordinate cobalt(I1) Schiff base complexes are effective for the dehydrogenation of hydrazones of aromatic ketones in aprotic solvents, providing a convenient method for the synthesis of aryldiazoalkanes, 3 and that N,N'-ethylenebis-(salicylideneiminato)cobalt(II), Co(salen), catalyzes oxidative degradation of

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