Synthesis and X-ray structure of fac-{[1,3-dithian-2-ylidene(ethoxy)methyl(ethoxy)carbene-C,S]t-butyl isocyanide}tricarbonylchromium(0). One of a new class of metallocyclic complexes obtained by the generation of anions α to co-ordinated sulphur atoms

Abstract

Reaction of [Cr{[graphic omitted]H₂}(CO)₅](1) with BuLi in the presence of t-butyl isocyanide, gives, via double carbonylation, the compound fac-[[graphic omitted]}(Bu^tNC)(CO)₃](2), which can be alkylated to yield the title compound, (3).