Diazoalkane complexes of molybdenum and tungsten via hydrazido(2–) complexes

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Abstract
The reaction of [Mo(N2)2(depe)2](depe = Et2PCH2CH2PEt2) with MeBr affords [MoBr(NNMe2)(depe)2]Br, whereas EtBr yields both [MoBr(NNEt)(depe)2] and [MoBr(NNEt2)(depe)2]Br. Condensation of acetaldehyde with [MBr(NNH2)(depe)2]+(M = Mo or W) gives the diazoalkane complexes [MBr(NNCHMe)(depe)2]+ which can be used to synthesize alkyldiazenido-compounds by reaction with Li[AlH4].