MATRIX INFRARED STUDY OF THE PHOTOLYSIS PRODUCTS OF 2,3-PYRIDINE DICARBOXYLIC ANHYDRIDE (2,3-PDA) - A SEARCH FOR 2,3-DIDEHYDROPYRIDINE

Photolysis of 2,3-PDA (1) in N2 or Ar matrices leads to loss of CO2 preferentially at C2 and formation of (2), whose end product is (3). In contrast to mild photolysis of 3,4-PDA, which yields 3,4-DHP, this mechanism precludes the intermediacy of 2,3-DHP (6) in the photolysis of 2,3-PDA. © 1990.