13C and 31P NMR Studies of Some Aminophosphonium Chlorides

Article abstract of DOI:10.1002/mrc.1260250409

The multinuclear NMR spectral data for an homologous series of tertiary phosphines R(3-n)P(NMe2)(n), aminophosphonium ions, (+), and phosphonium ions, (+), where R=Me, Et, (n)-Pr and Ph, R' and/or R''=H, Me and n=0 and 1 are reported and discussed.Quaternization by alkylation or alkylation or chloramination causes an increase in the 31P chemical shift (Δδ_P is positive), a decrease in the 13C chemical shift (Δδ_C is negative) for all carbons, an increase in the magnitudes of ¹J(PC), ³J(PC), ³J(PNCH) and ²J(PCH) and a decrease in the magnitude of ²J(PC).Substitution of a Me2N group for an alkyl or aryl group produces an increase in the 31P chemical shift and in the magnitude of ¹J(PC). α- and β-deshielding and γ-shielding effects are noted in the 13C NMR spectra and β-deshielding and γ-shielding effects are noted in the 31P NMR spectra with substitution on the phosphorus and nitrogen atoms. - Key words: 13C NMR, 31P NMR, Tertiary phosphines, Aminophosphonium ions, Phosphonium ions