A series of complexes of the form TpM(NO)(L')(
2-L) are prepared (where L is a nitrile, ketone, oralkene, M = W or Mo, L' = PMe
3, MeIm, Tp = hydridotris(pyrazolyl)borate). These complexes aresubjected to various electrophiles (e.g., alkyl halides, Br
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nsted acids) to systematically probe the abilityof the
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-basic transition metal to affect the reactivity of the dihapto-coordinated ligand. Alkylation isobserved at the heteroatom of the ketone and the nitrile, but depending on the reagent, alkylation of thenitrosyl ligand or addition to the complexed
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-bond also occurs. The structures of several nitri
liumcomplexes and a rare example of an
2-acetonium complex are also reported.