Nmr, Absorption and Fluorescence Parameters of Azlactones

Absorption and fluorescence wavelenghts for a series of azlactones have been measured from acetonitrile solutions that had no pre-light exposure. Fluorescence quantum yields, Q(F), are found to be in general less than 0.01, excluding the the derivatives with naphthyl and p-dimethylaminophenyl substituents. Previously reported Q(F) values did not fit to our results.