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Titolo:
EFFECT OF ALKALI-METAL CATIONIZATION ON THE COLLISION-INDUCED DECOMPOSITION OF ALKYL R-O-ACETYL-2-DEOXY-2-HALO-ALPHA-O-MANNOPYRANOSIDES
Autore:
MADHUSUDANAN KP; RANI A; KUMAR B; SURYAWANSHI SN;
Indirizzi:
CENT DRUG RES INST,DIV MEDICINAL CHEM,CHATTAR MANZIL,POB 173 LUCKNOW 226001 UTTAR PRADESH INDIA
Titolo Testata:
Organic mass spectrometry
fascicolo: 8, volume: 28, anno: 1993,
pagine: 892 - 898
SICI:
0030-493X(1993)28:8<892:EOACOT>2.0.ZU;2-L
Fonte:
ISI
Lingua:
ENG
Soggetto:
TANDEM MASS-SPECTROMETRY; SEMIEMPIRICAL CALCULATIONS; O-ACETYL; DISACCHARIDES; IONS; OLIGOSACCHARIDES; ACTIVATION;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
18
Recensione:
Indirizzi per estratti:
Citazione:
K.P. Madhusudanan et al., "EFFECT OF ALKALI-METAL CATIONIZATION ON THE COLLISION-INDUCED DECOMPOSITION OF ALKYL R-O-ACETYL-2-DEOXY-2-HALO-ALPHA-O-MANNOPYRANOSIDES", Organic mass spectrometry, 28(8), 1993, pp. 892-898

Abstract

The effect of alkali metal cationization on the collision-induced decomposition of alkyl -2-deoxy-2-bromo-and-iodo-alpha-O-mannopyranosideswas studied. The bromo sugars gave fairly abundant MH+, whereas for the iodo sugars the MH+ ions were insignificant. However, both the bromo and the iodo derivatives gave abundant M + alkali metal ion complexes. In contrast to the behaviour of the MH+ ion, the [M + Li]+, [M + Na]+ and [M + K]+ ions of these compounds do not decompose by loss of the C(1) substituent. Elimination of AcOH is the preferred fragmentationpathway of [M + Cat]+. Elimination of HX occurs only after loss of AcOH and CH2CO from MH+, whereas [M + Cat]+ directly loses HX. The elimination of HX is more pronounced from [M + Na]+ and [M + K]+ than from [M + Li]+. Loss of AcOLi is an additional fragmentation route observedin the case of the decomposition of [M + Li]+ ion.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 19/09/20 alle ore 12:56:10