title: Electron ionization mass spectrometric study of 1,4-dihydro-4-substituted 2,6-dimethyl-3,5-bis(alkoxycarbonyl)pyridines.
abstract: Using the accurate masses obtained from a time-of-flight instrument and the tandem mass spectrometric (MS/MS) data from an ion trap instrument, electron ionization mass spectra of a series of 1,4-dihydro-4-substituted 2,6-dimethyl-3,5-bis(alkoxycarbonyl)pyridines are reported and rationalized. Two sets of fragmentation pathways are proposed. One involves the formation of fragment ions containing the 1,4-dihydropyridine structure, and the other of ions containing a pyridine ring.
authors.affiliation: Department of Chemistry, University of Science and Technology of China, Hefei, Anhui 230026, China.
authors.forename: Hojatollah
authors.initials: H
authors.lastname: Salehi
authors.forename: Qianrong
authors.initials: Q
authors.lastname: Li
authors.forename: Hao
authors.initials: H
authors.lastname: Yin
authors.forename: Yi
authors.initials: Y
authors.lastname: Ding
authors.forename: Qingxiang
authors.initials: Q
authors.lastname: Guo
mesh_terms: D015394:Molecular Structure; D011725:Pyridines / Q000032:analysis* / Q000737:chemistry*; D021241:Spectrometry, Mass, Electrospray Ionization
chemical_list: D011725:Pyridines; C023666:pyridine