EFFECTS OF ADDITIVES ON PHOTO-METHOXYLATION OF METHYL 2-PYRIDINECARBOXYLATE IN ACIDIC METHANOLIC SOLUTIONS. PROMOTION BY 4-SUBSTITUTED PYRIDINES.

Article abstract of DOI:10.1246/bcsj.56.1817

The rate of photo-methoxylation of methyl 2-pyridinecarboxylate(1) in acidic methanol is accelerated by 4-substituted pyridines and their analogs, 4,4 prime -bipyridine and pyrazine. The photo-methoxylation of 1 is not promoted by triplet sensitizers, electron donors, or electron acceptors. Detailed analyses on the 1-4-pyridine-carbonitrile(3) system including wavelength dependence lead to a mechanism for the promotion via an excited complex formed from an excited 1 and 3 in the ground state.