Abstract: 1H and 31P nmr spectra of 15 lRl-phospha-2, 6-dioxacyclohexanes have been examined, in which R= OCH3, OC (CHJ3, SCsHs, C6H5, F, C1 and Br. Two methyl substituents were present in the ring at C3 and Cs or at C4. Spectra of several 4-methyl-4- chloromethyl systems were also studied as well as 3, 9-dimethoxy-2, 4, 8, lO-tetra-oxa-3, 9- diphosphaspiro [5.5] undecane. The bulk of the nmr evidence is consistent with the ...