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), Journal Name: Chem. Heterocycl. Compd. (Engl. Transl.); (United States) Vol. 21:12; ISSN CHCCA
• Country of Publication: United States
• Language: English

Related Subjects

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