Silver(I) complex of a crown thioether retaining the transoid S-C-C-S ligand conformation

Article abstract of DOI:10.1002/cber.19961290517

The crown thioether 3 with the novel diisopropylidene building block was synthesized by an S′_N cyclization reaction of 2,7-dichloro-2,7-dirnethylocta-3,5-diyne (1) with 3-thiapentane-1,5-dithiol (2). Ligand 3 shows all the sulfur centers in exodentate positions. Reaction of 3 with Ag^I triflate and triphenylphosphane yielded the tetrahedral complex 4, which shows unique spectroscopic data in solution. Crystalli-zation furnished two different crystal forms (4a and 4b). Both are different conformers which are stable in the solid state. 4a exhibits a crown-like structure of the thioether ligand with cisoid S-C-C-S chains. To our knowledge 4b is the first silver(I) complex with a crown thioether retaining the transoid S-C-C-S conformation in the metal complex. VCH Verlagsgessllschaft mbH, 1996.