Cycloocta-1,5-diene complexes metal carbonyls

Catalytic and photochemical processes using mixed metal carbonyls are also represented. Tin-cobalt carbonyl compounds have been used as catalysts for ring-opening of oxiranes by secondary and tertiary alcohols 121 and the photochemical reactions of Pt2M4(CO)jg (M=Os, Ru) with cycloocta-1,5-diene under UV irradiation 122,123,124 jjgve been reported. A new rhenium-cobalt complex has been characterised 126 and Pt(cod)2 has been used to prepare new complexes via its reaction with 0 3(CO) jQ(FlCMe)2 26. 

It is worth mentioning that the first transition metal complex of a natural product was obtained by treating tocopherylquinone (vitamin-E-quinone) with nickel carbonyl in the presence of cycloocta-1,5-diene. A study of its physiological properties promises to be interesting (59). 

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