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The synthesis of the new ligand (C6H5)2PCH2OP(C6H5)2 is reported. Coordination compounds of this ligand and its analog (C6Hs)2PCH2CH2OP(C6H5)2 with chromium, molybdenum, and tungsten carbonyls and with PdCl2 are reported with 31P and • nmr data, including phosphorus-phosphorus and phosphorus-tungsten coupling constants where appropriate. Phosphorus nmr data are also reported for (C6Hs)2P(CH2)nP(C6H5)2M(CO)4, where M = Cr, Mo, or W and n-1,2, or 3. An unusually large downfield phosphorus coordination shift is observed in the case of all five-membered chelate rings, which is not observed in the case of the fourand six-membered chelate rings.

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