Catalyst–substrate complexes of chiral seven-membered ring chelates of rhodium( I )-bis(phosphinites)

Line-shape analysis of 31P NMR spectra of catalyst substrate complexes of seven-membered ring rhodium(I)-bisphosphinites indicate for the first time a quantifiable preference of the intramolecular major–minor isomerisation of both diastereoisomeric chelates of dimethyl itaconate over the slow intermolecular interconversion.