2-Pentyne Complexes of Molybdenum (II) and Tungsten (II)

Treatment of [MI2(CO)3(NCMe)2](M = Mo, W) withtwo equivalents of EtC2Me in CH2Cl2 at 0Co yields the bis (2-Pentyne) complexes [MI2(CO)(NCMe)(η^2-EtC2Me)2] (1 and 2). complexes.1 and 2 react with two equivalents of PPh3 in CH2Cl2 to give the complexes [MI2 (CO) (PPh3)2 (η^2-EtC2Me)] (3 and 4).Reaction of 1 and 2 with an equimolar amount of Ph2P (CH2)nPPh2 to give [MI2(CO){(Ph2P(CH2)nPPh2}(η^2-EtC2Me)] (for M =MO, W; n = 1-4) (5-12).