CONVENIENT PREPARATION OF METAL-CARBONYL MONOANIONS BY TRIALKYLBOROHYDRIDE CLEAVAGE OF METAL-CARBONYL DIMERS - OBSERVATION AND REACTIONS OF A BIMETALLIC MANGANESE-FORMYL INTERMEDIATE
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abstract
Commercially available Li(C 2 H 5 ) 3 BH rapidly and quantitatively cleaves [Mn(CO) 5 ] 2 , [Co(CO) 4 ] 2 , and [(C 5 H 5 )Mo(CO) 3 ] 2 in THF at room temperature to the corresponding transition metal monoanions. [(C 5 H 5 )Fe(CO) 2 ] 2 can be cleaved in hexamethylphosphorous triamide (HMPA) or by use of K((unsec)-C 4 H 9 ) 3 BH. The mechanism postulated for Li[Mn(CO) 5 ] formation (Scheme I) is supported by the direct observation of a manganese-formyl intermediate ((un4)) and rate data. ((un4)) acts as a hydride donor toward CH 3 SO 3 F, Fe(CO) 5 , and HMn(CO) 5 . 1977.
