An oxorhenium complex bearing a chiral cyclohexane‐1‐olato‐2‐thiolato ligand: Synthesis, stereochemistry, and theoretical study of parity violation vibrational frequency shifts.

Abstract: In our effort towards measuring the parity violation energy difference between two enantiomers, a simple chiral oxorhenium complex <bold>5</bold> bearing enantiopure 2‐mercaptocyclohexan‐1‐ol has been prepared as a potential candidate species. Vibrational circular dichroism revealed a chiral environment surrounding the rhenium atom, even though the rhenium is not a stereogenic center itself, and enabled to assign the (1S,2S)‐(−) and (1R,2R)‐(+) absolute configuration for <bold>5</bold>. For both compound <bold>5</bold> and complex <bold>4</bold>, previously studied by us and bearing a propane‐2‐olato‐3‐thiolato ligand, relativistic calculations predict parity violating vibrational frequency differences of a few hundreds of millihertz, above the expected sensitivity attainable by a molecular beam Ramsey interferometer that we are constructing. [ABSTRACT FROM AUTHOR]