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Titolo:
Revision of the a(2)(H) value for N,N-dialkylhydroxylamines based on kinetic and spectroscopic measurements
Autore:
Astolfi, P; Greci, L; Paul, T; Ingold, KU;
Indirizzi:
Univ Ancona, Dipartimento Sci Mat & Terra, I-60131 Ancona, Italy Univ Ancona Ancona Italy I-60131 Sci Mat & Terra, I-60131 Ancona, Italy Natl Res Council Canada, Ottawa, ON K1A 0R6, Canada Natl Res Council Canada Ottawa ON Canada K1A 0R6 tawa, ON K1A 0R6, Canada
Titolo Testata:
JOURNAL OF THE CHEMICAL SOCIETY-PERKIN TRANSACTIONS 2
fascicolo: 9, , anno: 2001,
pagine: 1631 - 1633
SICI:
1472-779X(200109):9<1631:ROTAVF>2.0.ZU;2-8
Fonte:
ISI
Lingua:
ENG
Soggetto:
HYDROGEN-BOND BASICITY; LOG K-VALUES; SOLUTE; TETRACHLOROMETHANE; COMPLEXATION; SCALE;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
5
Recensione:
Indirizzi per estratti:
Indirizzo: Astolfi, P Univ Ancona, Dipartimento Sci Mat & Terra, Via Brecce Bianche, I-60131 Ancona, Italy Univ Ancona Via Brecce Bianche Ancona Italy I-60131 ona, Italy
Citazione:
P. Astolfi et al., "Revision of the a(2)(H) value for N,N-dialkylhydroxylamines based on kinetic and spectroscopic measurements", J CHEM S P2, (9), 2001, pp. 1631-1633

Abstract

Kinetic solvent effects on hydrogen-atom abstraction from N,N-diethylhydroxylamine and N,N-dibenzylhydroxylamine by the 2,2-diphenyl-1-picrylhydrazylradical (DPPH.) indicated that these compounds are much weaker hydrogen-bond donors than implied by the currently accepted a(2)(H) value of 0.453. Lower a(2)(H) values were also obtained by monitoring 1 : 1 complex formationwith two strong hydrogen-bond acceptors, HMPA and DMSO, in tetrachloromethane using IR spectroscopy. It is concluded that the a(2)(H) value for sterically non-hindered N,N-dialkylhydroxylamines should be revised downward to 0.29.

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Documento generato il 02/10/20 alle ore 01:48:33