A carbon‐13 nuclear magnetic resonance spectral investigation of substituted triphenyl phosphates

Abstract

Abstract 13 C NMR chemical shifts and 13 C 31 P couplings are reported for triphenyl phosphate and 13 alkyl derivatives. In ortho ‐alkylated materials, it is found that the upfield γ shielding effect is only operative when the carbon atom, situated γ to the exocyclic oxygen, bears at least one hydrogen. Conformational changes about the arylO bond can be monitored via the vicinal 31 pOC 13 C couplings.