Preparation and Properties of Stabilized Thioxophosphine Sulfides Bearing the 4-<b><i>t</i></b>-Butyl-2,6-bis(dialkylaminomethyl)phenyl or the 2,4-Di-<b><i>t</i></b>-butyl-6-(dialkylaminomethyl)phenyl Substituents
Stabilized thioxophosphine sulfides bearing the 4-t-butyl-2,6-bis(dialkylaminomethyl)phenyl or the 2,4-di-t-butyl-6-(dialkylaminomethyl)phenyl group, as well as their 15N labeled analogs, were prepared. Intramolecular interaction between the nitrogen and the phosphorus atoms was investigated, mainly by means of 31P NMR and 1H NMR spectroscopic studies.