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Asymmetric induction in oxygenation of styrene catalyzed by cobalt schiff base complex

✍ Scribed by Akira Nishinaga; Hitoshi Yamato; Toshio Abe; Kazushige Maruyama; Teruo Matsuura

Publisher
Elsevier Science
Year
1988
Tongue
French
Weight
265 KB
Volume
29
Category
Article
ISSN
0040-4039

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✦ Synopsis

The oxygenation of styrene catalyzed by optically active cobalt Schiff base complexes in 2-propanol gives an enantiomer excess of l-phenylethanol. The asymmetric induction may be accomplished in two steps: addition of CoH species to styrene and decomposition of 1-phenylethyl hydroperoxide. Cobalt Schiff base complexes [Co(SB)] are quite interesting because of their characteristic activities in oxygenation reactions. For example, in aprotic solvents, they exhibit dioxygenase-like activity in addition to the reversible formation of dioxygen complexes. 1,2 In protic solvents, on the other hand, they are oxidized irreversibly to cobalt(II1) species3 and turn to promote monooxygenations of organic molecules, 4 including ketonization of

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