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Rapid Commun Mass Spectrom
; 13(21): 2071-9, 1999.
Article
in English
| MEDLINE
| ID: mdl-10523762
ABSTRACT
The electron impact induced fragmentations of seven methoxynaphthoflavones have been studied with the aid of low- and high-resolution measurements, metastable decompositions and isotope labelling using carbon-13 atoms. The retro Diels-Alder cleavage of the methoxynaphthoflavones is strongly influenced by the substituent position providing in most cases intact A- and B-ring fragments. The intensity ratio of these ring fragments appears to be very sensitive to the charge distribution within the parent ion. Copyright -Copyright 1999 John Wiley & Sons, Ltd.