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Equimolar quantities of [WI(CO)(NCMe)(dppm)(η 2 -MeC 2 Me)][BF 4 ] {dppm = Ph 2 P(CH 2 )PPh 2 ) and NaSR (R = Et. Bu t  ,Ph or CH 2 Ph) react in CH 2 Cl 2  at room temperature to give the neutral thiolate complexes [WI(SR)(CO)(dppm)(η 2 -MeC 2 Me)] (1 → 4) in good yield. The complex [WI(CO)(NCMe)(dppm)(η 2 -MeC 2 Me)][BF 4 ] also reacts with two equiv­alents of NaSR (R = Et. Bu t , Ph or CH 2 Ph) in CH 2 Cl 2  at room temperature to afford the bis(thiolate) complexes [W(SR) 2 (CO)(dppm)(η 2 -MeC 2 Me)] (5 → 8), in good yield. Com­plexes 1→8 have been characterized by elemental analysis (C, H and N), IR and  1 H NMR spectroscopy.  13 C NMR spectra of selected complexes indicate that the 2-butyne ligand is donating four electrons to the metal in both [WI(SR)(CO)(dppm)(η 2 -MeC 2 Me)] and [W(SR) 2 (CO)(dppm)(η 2 -MeC 2 Me)] type complexes.

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The Preparation of Some Mono-and Bis(thiolate)-2-butyne Complexes of Tungsten(II) of the Types [WI(SR)(CO)(dppm )(η 2 -MeC 2 Me)] {dppm = Ph 2 P(CH 2 )PPh 2 ; R = Et, Bu t , Ph or CH 2 Ph} and [W (SR) 2 (CO)(dppm)(η 2 -MeC 2 Me)]