Abstract
UV irradiation of complexes of the type (η 5-C 5H 5)(CO) n MSiR 3 ( n = 2, M Fe; n = 3, M Mo) in the presence of phosphorus ligands such as P(XC 6H 5) 3 (X O, S, CH 2) and phosphines containing allyl, 1-naphthyl or tolyl groups gives cyclometalated complexes, R 3SiH being eliminated with retention of configuration at Si. In the cyclometalation five-membered rings are formed in preference to six-membered rings, and metalation occurs more easily at sp 2 than at sp 3 carbon atoms. Methylphenyl-1-naphthylphosphine undergoes rapid racemization upon UV irradiation at room temperature.
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