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All members of the series L n Ph 3-n PY and n-Bu 3 PY; L = Me 2 N, MeO; n = 0, 1, 2, 3; Y = O, S, Se, nil, have been prepared and converted to the methylchalkogeno-phosphonium ions L n Ph 3-n PYMe ⊕  and n-Bu 3 PYMe ⊕  respectively. For the accompaning change in the  31 P chemical shift both positive and negative values are found. They depend on Y and n, are most negative for Y=O, and increase approximately linearly with n. To interpret the shift differences it is suggested, that Y on methylation decreases and L increases the shielding of P by altering their (p→d)π electron contributions. The  1 H-NMR and IR spectra are also considered.

31 P-NMR-Untersuchungen VII: Verschiebung der 31 P-Resonanz von Phosphinchalkogeniden in Substitutionsreihen und bei Chalkogenmethylierung