ISSN:
0749-1581
Keywords:
13C NMR
;
31P NMR
;
Tertiary phosphines
;
Aminophosphonium ions
;
Phosphonium ions
;
Chemistry
;
Analytical Chemistry and Spectroscopy
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
Notes:
The multinuclear NMR spectral data for an homologous series of tertiary phosphines, R3-nP(NMe2)n, aminophos-phonium ions, [R3PNR′R″]+, and phosphonium ions, [R4-nPMe]+, 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 chloramination causes an increase in the 31P chemical shift (Δ δP is positive), a decrease in the 13C chemical shift (Δ δC 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.
Additional Material:
1 Tab.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/mrc.1260250409
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