Abstract
Aryl Grignard reagents react with halogenomethinyltricobalt enneacarbonyls to give the corresponding aryl-clusters in good yield. Substitution with alkyl Grignard reagents is not possible. Reactions with organolithium and Grignard reagents (under a CO atmosphere) invariably give products formed by CO insertion, principally the acid, HO2CCCo3(CO)9. Possible intermediates in these reactions are discussed.
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