1,8-Cyclotetradecadiyne complexes of molybdenum(II) and tungsten(II)

Article abstract of DOI:10.1016/0022-328X(88)83027-4

The complexes (M=Mo and W) react with an equimolar amount of 1,8-cyclotetradecadiyne (1,8-CTDiyne) in CH2Cl2 at room temperature to give the new bisalkyne complexes 2,η²'-l,8-CTDiyne)> in good yield. (13)C NMR spectroscopy confirms that 1,8-CTDiyne is coordinated as a bisalkyne ligand in these complexes.The complex 2,η²'-1,8-CTDiyne)> reacts with Ph2P(CH2)PPh2 (dppm) in refluxing chloroform (48 h) to give the complex 2-1,8-CTDiyne)> where the 1,8-CTDiyne is bonded via one of its alkyne functional groups. (13)C NMR spectroscopy indicates that the alkyne ligand in this complex is donating 4-electrons to the tungsten.The compounds 2,η²'-1,8-CTDiyne)> also react with one equivalent (M=W) and two equivalents (M=Mo) of CyN=CHCH=NCy in CH2Cl2 to give the novel monocationic complexes 2,η²'-1,8-CTDiyne)>I * Et2O and 2,η²'-1,8-CTDiyne)>I.The preparations of the new monoalkyne complexes 2-1,8-CTDiyne)> (X=NEt2 and NC4H8) are also described.