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Titolo:
Proton affinities of saturated aliphatic methyl esters
Autore:
Evans, J; Nicol, G; Munson, B;
Indirizzi:
Univ Delaware, Dept Chem & Biochem, Newark, DE 19716 USA Univ Delaware Newark DE USA 19716 pt Chem & Biochem, Newark, DE 19716 USA
Titolo Testata:
JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY
fascicolo: 9, volume: 11, anno: 2000,
pagine: 789 - 796
SICI:
1044-0305(200009)11:9<789:PAOSAM>2.0.ZU;2-F
Fonte:
ISI
Lingua:
ENG
Soggetto:
KINETIC METHOD; GAS-PHASE; THERMOCHEMICAL DETERMINATIONS; GENERAL SCHEME; ORGANIC IONS; HEATS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
25
Recensione:
Indirizzi per estratti:
Indirizzo: Munson, B Univ Delaware, Dept Chem & Biochem, Newark, DE 19716 USA Univ Delaware Newark DE USA 19716 Biochem, Newark, DE 19716 USA
Citazione:
J. Evans et al., "Proton affinities of saturated aliphatic methyl esters", J AM SOC M, 11(9), 2000, pp. 789-796

Abstract

The kinetic method was used to determine the proton affinities of methyl eaters of several saturated fatty acids. Decompositions of the proton-bound dimers of the methyl esters, AHB(+) were observed under different conditions with two instruments. The proton affinities (PAs) of the methyl esters increase continually with increasing carbon number in the acid. Equilibrium and initial rate experiments were performed with a Fourier transform ion cyclotron resonance mass spectrometer on the methyl ester of the C-22 saturated acid (methyl behenate). These experiments give values for PA (methyl behenate) that are perhaps slightly lower than those obtained with the kinetic method. The Pas of the methyl esters of the fatty acids could be correlatedwith the equation: PA (ester) = (40.0 +/- 2.5)*log(n) + (784.7 +/- 3.9) kJ/mol or PA (ester) = (864 +/- 2) - (479 +/- 41)/n, where it = number of atoms in the molecule. Proton affinities of smaller sets of 1-alkylamines and 1-alkanols can be fit to similar equations. (C) 2000 American Society for Mass Spectrometry.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 12/07/20 alle ore 12:00:44