Abstract
Summary In alcoholic solution the wavelength of maximum absorption of those acids which contain a carboxyl group attached to, or conjugated with, an aromatic nucleus is shifted toward the shorter wavelengths in the presence of sodium acetate. This shift provides an easy method for distinguishing aromatic acids from their esters and other phenolic compounds in plant extracts. Esters and simple phenols do not show such a shift. Addition of sodium ethylate to an alcoholic solution of an acid or ester results in a bathochromic shift. The shift is considerably greater with esters than with the corresponding acids.
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