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The existence of octahedral solvates of the Al3+ cation with trimethyl phosphate, dimethyl methyl-phosphonate, and dimethyl phosphite and a tetra-hedral solvate of hexamethylphosphoramide, is shown by their 27Al n.m.r. spectra in nitromethane.
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Delpuech et al. (1974) studied this question.
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