Addition of the [(tBuP)3As]− anion to the cyclopentadienyl ring of [(C5H5)M(CO)3Cl] (M = Mo, W)

Reactions of the [((BuP)-Bu-t)(3)As](-) anion with [(C5H5)M(CO)(3)Cl] (M = Mo, W) gives [(C5H4{As((PBu)-Bu-t)(3)})M(CO)(3)Cl] (M = Mo 1; M = W 2) as a result of addition to the C5H5 ring (with formal elimination of LiH), rather than the expected product resulting from substitution of the metal-bonded Cl ligand.