1997
DOI: 10.1002/(sici)1097-0231(19970830)11:13<1457::aid-rcm47>3.0.co;2-s
|View full text |Cite
|
Sign up to set email alerts
|

Abstract: Positive-ion electron ionization (EI), methane chemical ionization (CI) and collision-induced dissociation (CID) mass spectra are reported for a series of pyridone-imines generated from 1-alkyl substituted aminopyridinium salts in a direct-probe inlet. The series comprises 1-methyl-2-imino-and 1-ethyl-2imino-1,2-dihydropyridine, the respective 4-imino isomers and 1,2,6-trimethyl-4-imino-1,4-dihydropyridine. Also compared is 1-methyl-4-methylene-1,4-dihydropyridine generated from 1,4-dimethylpyridinium salts. R… Show more

Help me understand this report

Search citation statements

Order By: Relevance

Paper Sections

Select...
1
1

Citation Types

0
3
0

Year Published

2001
2001
2011
2011

Publication Types

Select...
6

Relationship

1
5

Authors

Journals

citations
Cited by 8 publications
(3 citation statements)
references
References 8 publications
0
3
0
Order By: Relevance
“…Odd‐electron molecular ions might arise by direct EI under imperfect CI conditions, but the occurrence of the M + . ion in the methane CI spectra has also been explained by transfer of an electron (charge transfer) from an analyte molecule to the methane plasma 16. The charge exchange has to be exothermic to be fast enough to compete with adduct formation common in CI.…”
Section: Resultsmentioning
confidence: 99%
“…Odd‐electron molecular ions might arise by direct EI under imperfect CI conditions, but the occurrence of the M + . ion in the methane CI spectra has also been explained by transfer of an electron (charge transfer) from an analyte molecule to the methane plasma 16. The charge exchange has to be exothermic to be fast enough to compete with adduct formation common in CI.…”
Section: Resultsmentioning
confidence: 99%
“…Scan time was typically 1 s per scan. CID spectra were obtained as previously described42 using rf peak excitation potentials of 600 and 700 mV. Data processing, verification of the origin of ions, verification of their chemical assignments and corrections for natural‐isotopic peaks were carried out as previously described 25.…”
Section: Methodsmentioning
confidence: 99%
“…They proposed two common characteristics of the EI fragmentation patterns of these compounds, loss of the C‐4 substituent on the dihydropyridine ring giving the ubiquitous base peak ( m/z 224), and loss of the C‐3 substituent (COOCH 3bold.) giving [M–59] + fragment ions. Other publications have paid special attention to the EI mass spectra of 1,2‐dihydropyridine11 and iminopyridine12 derivatives. In continuation of our preliminary communication for the characterization of a series of 1,4‐dihydro‐4‐substituted 2,6‐dimethyl‐3,5‐bis(alkoxycarbonyl)pyridines ( 1 – 15 , Fig.…”
mentioning
confidence: 99%