Zobrazeno 1 - 10
of 285
pro vyhledávání: '"Robert Flammang"'
Autor:
Igor W. Ouédraogo, Michael Boulvin, Robert Flammang, Pascal Gerbaux, Yvonne L. Bonzi-Coulibaly
Publikováno v:
Molecules, Vol 14, Iss 9, Pp 3275-3285 (2009)
Three carbonyl-containing extracts of essential oils from Eucalyptus citriodora (Myrtaceae), Cymbopogon citratus (Gramineae) and Lippia multiflora (Verbenaceae) were used for the preparation of oximes. The reaction mixtures were analyzed by GC-MS and
Externí odkaz:
https://doaj.org/article/512ed2b7b76f4b818c265c9faf0bc5e8
Autor:
F. Kyle Reed, M. Nance Ericson, N. Dianne Bull Ezell, Roger A. Kisner, Lei Zuo, Haifeng Zhang, Robert Flammang
Publikováno v:
Nuclear Technology. 208:1497-1510
Publikováno v:
Bulletin des Sociétés Chimiques Belges. 84:207-211
Benzoxazole and 1, 2-benzisoxazole are isomerized in an o-cyanophenol structure before degradation (losses of CO and HCN) as evidenced by analysis of metastable ions abundances and shapes.
Publikováno v:
Bulletin des Sociétés Chimiques Belges. 84:213-218
The M-HCN+. ion observed in the mass spectrum of benzothiazole is the result of two degradation processes:i) specific fragmentation of the heterocyclic part of the molecule and ii) isomerisation into an o-mercaptobenzonitrile structure which eliminat
Autor:
Robert Flammang, Richard Martin
Publikováno v:
Bulletin des Sociétés Chimiques Belges. 80:433-438
A new route to 2,7-disubstituted pyrene derivatives is described. 2,7-di(ethoxycar-bonyl) pyrene is synthesized in eight steps from pyrene.
Publikováno v:
Bulletin des Sociétés Chimiques Belges. 74:418-425
The N. M. R. spectra of twelve monosubstituted pyrene derivatives (position 1) have been recorded at 60 Mc. In ten cases, the position of substitution can be deduced by first order analysis of the spectra.
Publikováno v:
Bulletin des Sociétés Chimiques Belges. 85:69-78
The design of a collision chamber located between the magnetic and electric sectors of a reversed geometry mass spectrometer is described. The analytical and theoretical interests of this arrangement are discussed. La construction d'une chambre de co
Publikováno v:
Bulletin des Sociétés Chimiques Belges. 84:1179-1187
Air introduction in the second field-free region of a reversed geometry mass spectrometer induces an important number of fragment ions which are recorded by scanning the ESA voltage. These C.I.D./M.I.K.E. spectra [collision induced dissociations/mass
Publikováno v:
Bulletin des Sociétés Chimiques Belges. 101:215-225
Electron impact ionization of 1-acryloylpyrazole [1] induces a unimolecular loss of CO forming ionized 1-vinylpyrazole [2] as shown by metastable ion characteristics and neutralization-reionization data. This CO loss implies a rate-determining isomer
Publikováno v:
Bulletin des Sociétés Chimiques Belges. 97:945-950
Flash-vacuum pyrolysis of 1-benzoylpyrazole 1 at ca 800° under low pressure conditions affords mainly 2-phenylfuran 2 and phenylallene 3 as indicated by a real-time analysis using tandem mass spectrometry and by preparative scale experiments. Althou