Fluorinated alkoxide ligands RO(-) (R=CH(CF3 )2 ) are the key to the isolation of compounds of the type [Cp2 Mo(OR)2 ]. When electron-donating groups R are employed, the Mo(OR)2 moiety can, and necessarily has to, serve as a ligand for Lewis acidic fragments, allowing the isolation and structural characterization of the first heterodimetallic alkoxide containing a Bi and a Mo center (1).
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Hunger et al. (1999) studied this question.