Reactions of (η-allyl)dicarbonylmolybdenum(II) complexes with phosphorus and arsenic donor ligands

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Reaction of [MoX(CO) 2(η-C 3H 5)(MeCN) 2] with the arsines Ph 2AsCH 2CH 2AsPh 2 (dae) and Ph 2AsCH 2AsPh 2 (dam) yields complexes of stoichiometry [MoX(CO) 2(η-C 3H 5)dae] (where X = Cl, Br or I) and [MoX(CO) 2(η-C 3H 5)] 2dam (where X = Cl or Br). The former are isomorphous with the known Ph 2PCH 2CH 2PPH 2 complexes, whereas the latter probably contain halogen and dam bridges. Under forcing conditions the corresponding ditertiary phosphines form the molybdenum(0) derivatives cis -Mo(CO) 2(Ph 2P(CH 2) nPPh 2] 2 (where n = 1 or 2).