SYNTHESIS OF SOME NOVEL MIXED SEVEN-COORDINATE DIIODOTRICARBONYL (TRIPHENYLPHOSPHITE) TRIPHENYLPHOSPHINE, ARSINE AND ANTIMONY COMPLEXES OF MOLYBDENUM(II) AND TUNGSTEN(II)

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Abstract
The complexes [MX, (CO),L] (M = Mo and W; L = PPh, and AsPh,; X = C1 and Br) are currently under investigation as catalysts for the ring-opening polymerisation of norbornene, J and it is proposed that it is the ease of phosphine or arsine dissociation in these complexes which governs the rate determining step in the mechanism. Although a wide variety of bis-phosphine complexes of the type [MX, (CO),L] (M = Mo and W; X = C1, Br and I; L = phosphine) have been reported, hitherto no examples of “mixed” phosphine/phosphite complexes of this type have been prepared. In this communication we wish to report the synthesis of the new “mixed” sevencoordinate complexes [MI, (CO),L(P(OPh))] (M = Mo and W, L = PPh, AsPh, and SbPh).