Mass spectral studies of organoboron compounds. Part I. Facility of hydrocarbon ion rearrangements in some phenylborolans under electron impact

1972 ◽  
pp. 878 ◽  
Author(s):  
R. H. Cragg ◽  
G. Lawson ◽  
J. F. J. Todd
Keyword(s):  
Electron Impact ◽  
Spectral Studies ◽  
Organoboron Compounds ◽  
Mass Spectral

Metal salt catalyzed carbenoids. XVIII. The electron impact mass spectral behavior of diazocarbonyl compounds. I.

1984 ◽  
Vol 62 (3) ◽  
pp. 554-560 ◽  
Author(s):  
D. S. Wulfman ◽  
James Roberts ◽  
Dennis K. Henderson ◽  
J. C. Romine ◽  
R. S. McDaniel Jr. ◽  
...  
Keyword(s):  
Electron Impact ◽  
Metal Salt ◽  
Spectral Studies ◽  
Spectral Behavior ◽  
Mass Spectral ◽  
Ethyl Diazoacetate ◽  
Methyl Diazoacetate ◽  
Electron Impact Mass ◽  
Impact Mass

Electron impact (EI) mass spectral studies of methyl diazoacetate, ethyl diazoacetate (1), methyl diazoacetoacetate (2), and dimethyl diazomalonate (3) indicate that loss of N2 is exceedingly difficult from the parent ion and was observed only with 3. Diazoacetylacetone exhibits an appreciable (M − 28)+. ExactMass and metastable transitions indicate fragmentation occurs in part via 1,2,3-oxadiazolium ion-radicals (6) or α-lactones (7) to furnish N2O and hyponitrite esters. (M − 28)+ from 1 results from loss of ethylene.

Electron impact mass spectral studies of hydrazine monoamine oxidase inhibitor drugs

1975 ◽  
Vol 2 (2) ◽  
pp. 82-89 ◽  
Author(s):  
Roland M. De Sagher ◽  
André P. De Leenheer ◽  
Albert E. Claeys ◽  
Annie A. Cruyl
Keyword(s):  
Monoamine Oxidase ◽  
Electron Impact ◽  
Monoamine Oxidase Inhibitor ◽  
Oxidase Inhibitor ◽  
Spectral Studies ◽  
Mass Spectral ◽  
Electron Impact Mass ◽  
Impact Mass

Mass spectral studies of a series ofN,N-dialkyl aminoethyl-2-chlorides and trimethyl silyl ethers ofN,N-dialkyl aminoethane-2-ols under electron impact conditions

2006 ◽  
Vol 41 (1) ◽  
pp. 59-70 ◽  
Author(s):  
T. Jagadeshwar Reddy ◽  
S. Prabhakar ◽  
M. Ravi Kumar ◽  
U. V. R. Vijaya Saradhi ◽  
M. Vairamani
Keyword(s):  
Electron Impact ◽  
Spectral Studies ◽  
Silyl Ethers ◽  
Mass Spectral

Mass Spectral Studies on Pyrazaboles

1976 ◽  
Vol 31 (12) ◽  
pp. 1662-1666 ◽  
Author(s):  
C. E. May ◽  
K. Niedenzu ◽  
S. Trofimenko
Keyword(s):  
Electron Impact ◽  
Mass Spectra ◽  
Ring System ◽  
Hydrogen Halide ◽  
Spectral Studies ◽  
Mass Spectral ◽  
Fragmentation Patterns ◽  
Structural Entity

The mass spectra of several pyrazaboles of type 1 (R = H) have been studied. The data illustrate that electron impact causes three major fragmentation patterns for the species. Symmetrical cleavage of the pyrazabole followed by further breakdown is common to all compounds. In addition, those pyrazaboles containing H or CH3 at the C atoms of the pyrazole rings undergo an electron impact-induced rearrangement which appears to result in the formation of a species containing a B2N3 ring as a structural entity; subsequent breakdown leads to a B2N2 ring system. The mass spectra of halo- or pseudohalo-substituted pyrazaboles evidence the ready loss of hydrogen halide as a predominant feature; no rearrangement ions are observed.

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