Acetone chemical ionization mass spectra of 16 natural Ξ±-amino acids and 5 free nucleobases show characteristic ions corresponding to [M + H] + , [M + 43] + and [M + 59] + ions. The proton affinities of the substrates are found to control the formation of the above ions. The site of acetylation of a
Acetone chemical ionization studies: Olefins
β Scribed by M. Vairamani; K. V. Siva Kumar; G. K. Viswanadha Rao
- Book ID
- 102557784
- Publisher
- John Wiley and Sons
- Year
- 1990
- Tongue
- English
- Weight
- 384 KB
- Volume
- 25
- Category
- Article
- ISSN
- 1076-5174
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β¦ Synopsis
Acyclic, cyclic and bicyclic olefins have been found to undergo acetylation in the gas phase under acetone chemical ionization, giving rise to diagnostic ions. Terminal olefins show enhanced loss of water from the [M + 431' adduct. The [M + 431+ ion of A3-A'-and A5-oIefins give characteristic collision-induced dissociation spectra.
π SIMILAR VOLUMES
## Abstract Acetone chemical ionization mass mass spectra of four isomeric hexenyl acetates were investigated. The characteristic decomposition of [M + CH~3~CO]^+^ adducts in the fieldβfree region reveals siteβspecific adduct formation of acetyl ion with the double bond and the acetoxy group.
## Abstract Acetone chemical ionization mass spectra of acyclic, cyclic and bicyclic alkyl acetates were studied. In addition to the formation of [M + H]^+^, [M + 43]^+^ and [M + 59]^+^ ions, ions corresponding to displacement by acetone were also observed. The results suggest that the displacement
## Abstract Acetone chemical ionization mass spectra of 14 monosubstituted aromatic compounds were studied. Benzene, toluene and halobenzenes give exclusively chargeβexchange spectra with very little fragmentation. Protonation is characteristic of compounds with higher proton affinities than aceton