
TY  - JOUR
A1  - Gillis, RG 
A1  - Porter, QN 
T1  - The Fragment Ion C<sub>13</sub>H<sub>9</sub>O<sub>2</sub> <I>m/z</I> 197 in the Mass Spectra of 2-(2&#8242;-R-phenyl)benzoic Acids
JF  - Australian Journal of Chemistry
JO  - Aust. J. Chem.
Y1  - 1990
VL  - 43
IS  - 1
SP  - 203
EP  - 207
KW  - 
UR  - https://doi.org/10.1071/CH9900203 
N2  - In the electron impact mass spectrum of 2-(2&#176;-R-phenyl)benzoic acids where R=H, NO2, OCH3, COOH, or Br, an abundant fragment ion m/z 197 is formed by an ipso substitution in which R is expelled as a radical. The structure of the ion m/z 197 has been shown by collision-activated dissociation to be identical with that of the protonated molecule formed by methane chemical ionization of 6H-dibenzo[ b,d ]pyran-6-one. 
ER  -

