Design, Synthesis And Characterization Of Novel Bidentate Phosphinidine Ligands

Phosphinine, or phosphabenzene is a class of novel phosphorus containing heterocyclic compounds. According to theoretical and computational studies, the aromaticity of phosphinine is higher than that of benzene rings to the tune of97%. Its unique molecular structures give rise to its as a π-acceptor and a myriad of coordination combinations.In this work, we aim to utilized established synthetic methods unique to our lab in constructing a phosphinine backbone. The synthetic route would see1-phenyl-3,4-dimethylphosphole reacting with alkynes, resulting in the bridged structure of1-phosphanorbornadienes. Through oxidation insertion, oxygen-sulfur exchanges and reductive elimination of sulfur at high temperature, we got a pair phosphinine backboned bis-phospha ligands. One of the ligands has an asymmetrical structure,(Scheme1).The other objective of the study is explore the synthetic possibility of bi-phosphinine ligand, introducing a Sn group into the phosphinine backbone and linking two units of phosphinine through homo-coupling reactions. However, the resulting compound is an unexpected2-chlorophosphinine structure (Scheme2). A series of2-chlorophosphinie derivatives were prepared thusly. Standard characterization was performed on these compounds.