Abstract
The 1H n.m.r. spectra of a range of mononuclear phosphorus(V) compounds, P(X)R3–n(NMe2)n(X = O or S, n= 1–3, and R = amino, alkylamino, chloro, phenoxy, or phenyl), have been measured in carbon tetrachloride and benzene solution. The proton signal is always shifted upfield in benzene solution relative to that measured in carbon tetrachloride solution. These results are best rationalised in terms of a weak complex formation between the phosphorus compound and benzene. Similar solvent shifts were observed in the 1H n.m.r. spectra of dimethylamino-derivatives of hexachloro- and hexabromo-cyclotriphosphazatriene, N3P3Cl6–n(NMe2)n(n= 1–4 and 6) and N3P3Br6–n(NMe2)n(n= 1–3), respectively. For a given degree of chlorine (or bromine) replacement, dimethylamino-groups cis to one another were shifted upfield to a greater extent than those trans to one another.
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