Negative ion mass spectra and structure of 4-substituted 1-phenyl-3-methyl-5-pyrazolones

Journal Article · Sun Jun 01 00:00:00 EDT 1986 · Chem. Heterocycl. Compd. (Engl. Transl.); (United States)

OSTI ID:6290819

Ermakov, A I; Sorokin, A A; Voronin, V G

This is the first study of the electron capture dissociative resonance (ECDR) mass spectra of 4-substituted 1-phenyl-3-methyl-5-pyrazolones. The major features of the fragmentation of these compounds under ECDR conditions were found relative to their substituent properties. After loss of the methyl group from the nitrogen atom, the pyrazolone ring isomerizes to a pyrazole ring with localization of the negative charge on the oxygen atom of the carbonyl group. The intensity of the (M - CH/sub 3/) - fragment depends on the substituent properties.

• OSTI ID: 6290819
• Journal Information: Chem. Heterocycl. Compd. (Engl. Transl.); (United States), Vol. 21:12; Other Information: Translated from Khim. Geterotsikl. Soedin.; 21: No.12, 1663-1670(Dec 1985)
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
74 ATOMIC AND MOLECULAR PHYSICS
PYRAZOLES
DISSOCIATION
IONIZATION
MASS SPECTRA
MOLECULAR STRUCTURE
BINDING ENERGY
DEUTERIUM COMPOUNDS
ELECTRON CAPTURE
ELECTRON-MOLECULE COLLISIONS
ELECTRONEGATIVITY
ELECTRONS
ISOMERS
METHYL RADICALS
MOLECULAR IONS
RESONANCE
VALENCE
ALKYL RADICALS
AZOLES
CAPTURE
CHARGED PARTICLES
COLLISIONS
ELECTRON COLLISIONS
ELEMENTARY PARTICLES
ENERGY
FERMIONS
HETEROCYCLIC COMPOUNDS
HYDROGEN COMPOUNDS
IONS
LEPTONS
MOLECULE COLLISIONS
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
RADICALS
SPECTRA
400201* - Chemical & Physicochemical Properties
640304 - Atomic
Molecular & Chemical Physics- Collision Phenomena