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Titolo:
The formation of protonated dimethyl ether from the metastable molecular ions of 1-methoxy-2-propanol, CH3OCH2CH(OH)CH3
Autore:
Nakajima, S; Asakawa, T; Sekiguchi, O; Tajima, S; Nibbering, NMM;
Indirizzi:
Gunma Natl Coll Technol, Gunma 3718530, Japan Gunma Natl Coll Technol Gunma Japan 3718530 echnol, Gunma 3718530, Japan Free Univ Amsterdam, Fac Exact Sci, Ctr Laser, Div Chem, NL-1081 HV Amsterdam, Netherlands Free Univ Amsterdam Amsterdam Netherlands NL-1081 HV terdam, Netherlands
Titolo Testata:
EUROPEAN JOURNAL OF MASS SPECTROMETRY
fascicolo: 1, volume: 7, anno: 2001,
pagine: 47 - 53
SICI:
1469-0667(2001)7:1<47:TFOPDE>2.0.ZU;2-4
Fonte:
ISI
Lingua:
ENG
Soggetto:
RADICAL CATIONS; GAS-PHASE; ELECTRON-IMPACT; DISTONIC IONS; COMPLEXES; DECOMPOSITIONS; DISSOCIATION; GENERATION; ANALOGS; ISOMERS;
Keywords:
1-methoxy-2-propanol; double hydrogen atom transfer (DHT); D-labeling; MIKE spectrometry; ion-molecule complexes;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
35
Recensione:
Indirizzi per estratti:
Indirizzo: Tajima, S Gunma Natl Coll Technol, Gunma 3718530, Japan Gunma Natl Coll Technol Gunma Japan 3718530 nma 3718530, Japan
Citazione:
S. Nakajima et al., "The formation of protonated dimethyl ether from the metastable molecular ions of 1-methoxy-2-propanol, CH3OCH2CH(OH)CH3", EUR J MASS, 7(1), 2001, pp. 47-53

Abstract

The unimolecular metastable decomposition of 1-methoxy-2-propanol, CH3OCH2CH(OH)CH3 (mol. wt. 90) induced by electron ionization, has been investigated by use of mass-analyzed ion kinetic energy (MIKE) spectrometry and D-labeling in conjunction with thermochemical data. In the metastable time window, the molecular ions decompose almost exclusively into ions at m/z 47 [i.e. protonated dimethyl ether, CH3O+(H)CH3] by the loss of a C2H3O radical species following a double hydrogen atom transfer (DHT). Until now, only one DHT mechanism has been proposed, involving and accounting for the loss of an acetyl radical, C2H3O. In the present study it is shown that more DHT mechanisms are operative, leading to the losses of isomeric C2H3O radicals. The results obtained are best explained by the formation of the key intermediate ion-molecule complexes [CH3OCH3+., CH3CHO] and [CH3OC3, CH2=C(H)OH+.] following unimolecular metastable dissociation of the molecular ion. Subsequent hydrogen atom abstraction channels by CH3OCH3+. in the former complex and proton abstraction channels by CH,OCH, in the latter complex lead eventually to the formation of protonated dimethyl ether with m/z 47.

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Documento generato il 05/04/20 alle ore 07:13:19