These diones or triones could be oxidized, forming a series of colored 
derivatives. These polyhydroxyl compounds were oxidized with ring 
cleavage. After prolonged irradiation only CO ,(NHy)2CO3, and NaCl, and 
traces of HCOOH and an amine compound were found (1324, 1624), 
Variability of the rate constant at various time intervals indicated 
that hydrolysis other than that which produced 3,5,6-Cl3-2-pyridinol must 
occur also. Possibly nucleophilic displacement of the ethoxy group may be 
involved (194). 
Estimated Half-life 
pH K(Days !) __ Days 
3.97 1.98 x 10 9 350 
4,95 6.43 x 107° 1080 
6.00 3.6 x 10% 1930 
Methanol 2.05 x 107* 340 
8.00 1.39 x 1074 50 
8.95 2.39 x 10-2 29 
9.96 9.50 x 107 a2 
12,00 3.66 0.19 
135 
