Nitro group photoreduction of 4-(2-nitrophenyl)- and 4-(3-nitrophenyl)-1,4-dihydropyridines

The intramolecular photoreduction of nifedipine occurs within a few ns, Φred = 0.3. The photoreduction of nimodipine and nitrendipine is enhanced in the presence of triethylamine, Φred < 0.03.