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Mass spectral studies of methoxynaphthoflavones
Author(s) -
Ardanaz Carlos E.,
Guidugli Federico H.,
Catalán César A. N.,
JosephNathan Pedro
Publication year - 1999
Publication title -
rapid communications in mass spectrometry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.528
H-Index - 136
eISSN - 1097-0231
pISSN - 0951-4198
DOI - 10.1002/(sici)1097-0231(19991115)13:21<2071::aid-rcm746>3.0.co;2-k
Subject(s) - chemistry , substituent , metastability , cleavage (geology) , ring (chemistry) , ion , electron ionization , labelling , high resolution , analytical chemistry (journal) , stereochemistry , organic chemistry , ionization , biochemistry , remote sensing , geotechnical engineering , fracture (geology) , engineering , geology
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 © 1999 John Wiley & Sons, Ltd.