Abstract
Addition of the electrophiles [CH 3] +, H +, [(PPh 3Au)] + to the metalladiborane anions [M(CO) 4(η 2-B 2H 5)] − (M = Fe, Ru, Os) has been investigated. Addition occurs at the metal center. The complexes CH 3Os(CO) 4(η 2-B 2H 5), HM(CO) 4(η 2-B 2H 5) (M = Ru, Os), and (PPh 3)AuM(CO) 4(η 2-B 2H 5) (M = Fe, Ru, Os) have been formed. NMR spectra of HM(CO) 4(η 2-B 2H 5) indicate that the H atom on the metal is cis to the B 2H 5 ligand. Relative stabilities of the complexes LM(CO) 4(η 2-B 2H 5) are in the order M = Os > Ru > Fe for a given electrophile and the order L = (Ph 3P)Au > H for a given metal.
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