Abstract
Reactions of sodium cyanotrihydroborate with the metal hexacarbonyls M(CO) 6 (M = Cr, Mo, and W) in boiling glyme give the yellow anions [H 3BCNM(CO) 5] − in which the cyano group acts as an electron donor. Reactions of sodium tetraphenylborate with the metal hexacarbonyls M(CO) 6 (M = Cr and W) in boiling diglyme give the yellow anions [(C 6H 5) 2-B{C 6H 5M(CO) 3} 2] − (M = Cr and W) in which two of the four phenyl rings are π-complexed to metal tricarbonyl moieties. Reactions of sodium cyanotriphenylborate with the metal hexacarbonyls M(CO) 6 (M = Mo and W) in boiling glyme result in complexation of the cyano group rather than the phenyl rings to give the yellow anions [(C 6H 5) 3BCNM(CO) 5] − (M = Mo and W). All of these new anionic metal carbonyl derivatives are isolated as their tetramethylammonium salts.
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