
%0 Journal Article
%A Duewell, H 
%A Haig, TJ 
%T A Neighboring Group Effect of Carbonyl as Shown in the Mass Fragmentation Patterns of 4-Oxochroman-5-acetic Acids and of Some Related Compounds
%J Australian Journal of Chemistry
%D 1988/04/01
%V 41
%N 4
%P 535-548
%K 
%R https://doi.org/10.1071/CH9880535
%U https://www.publish.csiro.au/paper/CH9880535 
%X Two examples of a neighbouring group effect of carbonyl first observed with 4-oxochroman-5-acetic acids are shown to occur quite generally during electron impact mass spectrometry of 2-acylbenzeneacetic acids, 2-acylbenzoic acids and their methyl esters. The free acids readily give the [parent - CO2] ion. 2-Acylbenzeneacetic acids and their methyl esters after loss of water or methanol, respectively, as a first step, lead to very stable isobenzofuran radical cations which form the base peaks in the mass spectra of the esters. 
