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).