Bis(alkylidynyl)tellurides and ditellurides

Abstract

The tellurocarbonylates [M(CTe)(CO)(2)(Tp*)](-) (M = Mo, W; obtained from [M(equivalent to CBr)(CO)(2)(Tp*)] and Li2Te or [M(equivalent to CLi)(CO)(2)(Tp*)] and Te) react with an additional equivalent of [M(equivalent to CBr)(CO)(2)(Tp*)] to give bis(alkylidynyl) tellurides, [M-2(mu-CTeC)(CO)(4)(Tp*)(2)], whilst oxidation with [Fe(eta-C5H5)(2)]PF6 affords the corresponding ditellurides [M-2(mu-CTe2C)(CO)(4)(Tp*)(2)]. The unprecedented M equivalent to CTeC equivalent to M and M equivalent to CTe2C equivalent to M bridges are discussed with reference to more conventional but rare alkylidynyltelluroethers [M(equivalent to CTeR)(CO)(2)(Tp*)] (R = Me, Bu-n, Ph).