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