A homologous series of alkynyl chalcoether complexes: [W( η 2 - i PrEC CPh)(CO) 2 (Tp*)]BF 4 (E = O, S, Se, Te; Tp* = hydrotris(dimethylpyrazol-1-yl)borate)

Abstract The first complete set of homologous alkynyl chalcoether complexes, isolated as the structurally characterized salts [W(η 2 - i PrEC CPh)(CO) 2 (Tp*)]BF 4 (A = O, S, Se, Te; Tp* = hydrotris(dimethylpyrazolyl)borate), result from the reactions of the free alkynes i PrEC CPh with [WI(CO) 3 (Tp*)] in the presence of AgBF 4 . The neutral complex [W(η 2 - i PrSeC CPh)Cl(CO)(Tp*)] is obtained from the reaction of [W(η 2 - i PrSeC CPh)(CO) 2 (Tp*)]BF 4 with [ n Bu 4 N]Cl and co-exists in two forms in solution as a result of slow rotational isomerism of the alkyne. Depending on the choice of solvent, either pure rotamer may be crystallised.