ISSN:
0030-493X
Keywords:
Chemistry
;
Analytical Chemistry and Spectroscopy
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
Notes:
The correlation with substituent constants reported previously for [YØCO]+/[ØCO]+ ratios in the electron ionization mass spectra of substituted benzophenones and acetophenones has also been observed in the electron ionization spectra of substituted benzils. The [YØCO]+/[ØCO]+ ratio for the substituted benzils varied with energy of the ionizing electrons according to predictions from a simple kinetic and thermochemical analysis. [YØCO]+/[ØCO]+ ratios in the charge exchange spectra of benzophenones obtained with Xe, Kr, CO, N2 and Ar gave good correlations with sub-stituent constants in agreement with the same analysis. Good correlations were also noted for [YØCO]+/[ØCO]+ ratios with substituent constants for [M]+ ions of the benzophenones of the same excess energy (5.5 eV). [YØCO]+/[ØCO]+ ratios for benzils obtained by charge exchange with [CO]+ also showed good correlations with substituent constant. It is suggested that [Ø]+ and [YØ]+ ions from the benzophenones may be formed primarily by one step decompositions of the molecular ions, but that the [Ø]+ and [YØ]+ ions from the benzils are formed primarily by decomposition of [ØCO]+ and [YØCO]+ ions.
Additional Material:
5 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/oms.1210070205
