The reaction mass spectrometry of cyclic glycols and monosaccharides with methylene chloride as reagent was studied. In the presence of ammonia, it was found that methylene chloride reacted stereoselectively with the quasimolecular ions of cyclic glycols and monosaccharides to form characteristic io
Stereochemical effects in mass spectrometry: Part 8-chemical ionization mass spectra of cyclic glycols and monosaccharides using formaldehyde dimethyl acetal as reagent gas
β Scribed by Ya-Ping Tu; Yao-Zu Chen; Su-Nian Chen; Mei-Lan Wang; Zhi-Zhong Jing
- Publisher
- John Wiley and Sons
- Year
- 1990
- Tongue
- English
- Weight
- 282 KB
- Volume
- 25
- Category
- Article
- ISSN
- 1076-5174
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β¦ Synopsis
Abstract
The chemical ionization mass spectra of cyclic glycols and monosaccharides using formaldehyde dimethyl acetal as reagent gas have been studied. In the gas phase, the stereospecific reaction of methylene acetal formation was observed. From the relative abundances of the characteristic ions the stereoisomers of these compounds may be definitely distinguished.
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Chemical ionization (CI) of trans-and cis-stilbene and of fumaric and maleic acid, using dichlorocarbene as reagent, was studied. In the CI ion source (CH,), dichlorocarbene added stereospecifically to the double bond of the sample molecule to form the corresponding ion of the 1,l-dichloropropane de