title: Mass spectral studies of methoxynaphthoflavones
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.
authors.affiliation: Departamento de Quimica Organica, INTEQUI-CONICET, Facultad de Quimica, Bioquimica y Farmacia, Universidad Nacional de San Luis, Chacabuco y Pedernera, San Luis, 5700 Argentina.
authors.initials: CE
authors.lastname: Ardanaz
authors.initials: FH
authors.lastname: Guidugli
authors.initials: CA
authors.lastname: Catalan
authors.initials: P
authors.lastname: Joseph-Nathan