Long range phosphorus-phosphorus coupling constants in bis(phosphorylhydroxymethyl)benzene derivatives

Long range spin-spin couplings found between two phosphorus atoms are quite rare phenomena. A new example of such a coupling through seven bonds is described for 1-(diethoxyphosphoryl)butyryloxymethyl]-4-(diethoxyphosphoryl)hydroxymethyl]benzene and 1,4-bisphosphorylhydroxymethyl]benzene and through six bonds for tetraethyl phenylene-1,3-(bishydroxymethylphosphonate). Coupling constants in this system are also well predicted by theoretical studies.