Photolysis of Pyridylmethyl- and Pyridiniomethylphosphonic Acids

Article abstract of DOI:10.1246/bcsj.63.2438

Upon UV-irradiation, the C-P bond of (4-pyridylmethyl)phosphonic acid cleaved only near the isoelectronic point to give 4-methylpyridinium phophate, while (1-benzyl-4-pyridiniomethyl)phosphonic acid underwent C-P bond cleavage above pH 4 to give 1-benzyl-4-methylpyridinium phosphate.On the other hand, the C-P bond of (2-pyridylmethyl)phosphonic acid cleaved under pH region of about 1 to 2, while (1-benzyl-2-pyridiniomethyl)phosphonic acid underwent C-P bond cleavage above pH4.