10.1016/j.jorganchem.2008.05.026
The research focuses on the synthesis and characterization of rhenium carbonyl complexes with P-coordinated phosphinoalkynes. The purpose of this study was to prepare new P-coordinated phosphinoalkynes with the fragment fac-{Re(CO)3}+, which would serve as starting materials to investigate the feasibility of a reaction similar to Scheme 1 with rhenium carbonyls, potentially leading to the formation of stable metallacycles in an aqueous medium. The researchers synthesized and characterized two series of rhenium carbonyl complexes, including anionic and neutral complexes with phosphinoalkynes, such as Ph2PC?CR (where R = Ph, Tol, tBu) and (o-Tol)2PC?CPh. The crystal structures of several complexes were determined using X-ray crystallography, and the electronic properties of the uncoordinated alkyne in these new rhenium complexes were analyzed based on 13C NMR data. The study concluded that the electronic characteristics of uncoordinated alkynes are similar in both rhenium and iron complexes, and the observed differences in reactivity between these metal complexes are related to the nature of the metallic fragments rather than the electronic features of the uncoordinated alkynes.