Abstract
The preparation and PMR spectra of the isomeric dimethyl tolylphoshonates and tolyldiphenylphosphine oxides are reported. In the ortho-isomers, a four bond coupling (1–1·7 c/s) of the methyl protons with the phosphorus atom was observed; no evidence for a similar five or six bond coupling in the meta- and para-isomers was obtained. The aromatic proton resonances of dimethyl para-tolylphosphonate were analyzed as an ABX system; the proton ortho to phosphorus in the corresponding ortho-isomer had the peak multiplicity of the A portion of an ABCX spectrum.
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