Electron impact studies. CIII—Negative ion mass spectra of naturally occurring compounds: Nitrobenzoyl derivatives of amino esters

1976 ◽  
Vol 11 (4) ◽  
pp. 429-435 ◽  
Author(s):  
B. Jane Stapleton ◽  
John H. Bowie
Keyword(s):  
Electron Impact ◽  
Mass Spectra ◽  
Negative Ion ◽  
Impact Studies ◽  
Amino Esters ◽  
Naturally Occurring ◽  
Derivatives Of

Electron impact studies. XCVI. Negative ion mass spectra of naturally occurring compounds. Nitrophenyl esters derived from long-chain acids andalcohols

1975 ◽  
Vol 28 (5) ◽  
pp. 1011 ◽  
Author(s):  
JH Bowie ◽  
BJ Stapleton
Keyword(s):  
Electron Impact ◽  
Analytical Method ◽  
Mass Spectra ◽  
Molecular Ions ◽  
Negative Ion ◽  
Impact Studies ◽  
Naturally Occurring ◽  
Molecular Anions ◽  
Positive Ion ◽  
Long Chain

The positive ion mass spectra of long-chain alcohols and acids are either devoid of molecular ions or contain such species in low abundance. The negative ion spectra of p-nitrophenyl esters of these compounds exhibit pronounced molecular anions, showing the technique to be a useful analytical method for these classes of compounds.

Electron impact studies. CVIII. Negative-ion mass spectra of the oxime group

1976 ◽  
Vol 29 (11) ◽  
pp. 2437 ◽  
Author(s):  
JH Bowie ◽  
S Janposri
Keyword(s):  
Electron Impact ◽  
Mass Spectra ◽  
Major Product ◽  
Negative Ion ◽  
Oxime Group ◽  
Impact Studies ◽  
Molecular Anions

Molecular anions derived from Ar-CH=NOH systems fragment by the process [MI- → [M-H2O]- to yield pronounced peaks corresponding to [ArCN]-. Molecular anions from Ar(CH2)nC(NOH)Ph (n = 0-2) also eliminate H2O, but the mechanisms are often complex. Possible mechanisms for some of these eliminations are suggested after consideration of the + E spectra of non-decomposing [M?H2O]- ions. A characteristic cyclization/retro process of o-O2NC6H4-CH=CH-C(NOH)R molecular anions produces CHO-CR=N-O- as the major product anion.

Electron impact studies. CXXIV—Negative ion mass spectra of organic functional groups. Thioacetanilides

1979 ◽  
Vol 14 (2) ◽  
pp. 101-103 ◽  
Author(s):  
K. Clausen ◽  
B. S. Pedersen ◽  
S. Scheibye ◽  
S.-O. Lawesson ◽  
J. H. Bowie
Keyword(s):  
Electron Impact ◽  
Functional Groups ◽  
Mass Spectra ◽  
Negative Ion ◽  
Impact Studies ◽  
Organic Functional Groups

Electron impact studies. XCVIII. Negative ion mass spectra of the carbonyl group. The Aryl-CO- and Aryl-COCO- systems

1975 ◽  
Vol 28 (10) ◽  
pp. 2169 ◽  
Author(s):  
JH Bowie ◽  
S Janposri
Keyword(s):  
Nitro Group ◽  
Electron Impact ◽  
General Formula ◽  
Carbonyl Group ◽  
Mass Spectra ◽  
Negative Ion ◽  
Aryl Group ◽  
Impact Studies ◽  
Molecular Anions

Collision-induced decompositions of molecular anions of the general formula aryl-CO-alkyl yield aryl- ions. The aryl-CO-aryl group is stable under these conditions. Parent anions from α-dicarbonyl systems do not generally fragment but, in the case of o-nitrobenzil, fragment anions are produced after cyclization of the nitro group at both carbonyl centres.

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