692 
Table II. The hydrolysis constant is in K-100(h7}). 
In parenthesis, the half-life in days. All measurements were made at pH 1-5 where 
the compounds exhibit greatest stability. At this pH the solution had minimal 
effects on hydrolysis. 



COMPOUND 0° 10° 20° 30° 40° 50° 60° 70° eat 
K200 
E 600 (I) 0.00054 0.0024 0.009 0.031 0.10 0.30 0,90 2.4 3.45 
| (5350) (1200) = (320) (93) (29) (9.6) (3.2) (1.2) 
E 605 (IV) 0.00021 0.00096 0.0042 0.016 0.058 0.19 0.61 1.76 3.80 
(13800) (3000) (690) = (180) (50) (15) (4.75) (1.65) 
Prep. S 776 (XXII) 0.00054 0.0024 0.009 0.031 0.10 0.30 0.90 2.4 3.45 
(5350) (1200) — (320) (93) (29) (9.6) (3.2) (1.2) 
PO-Systox (VII) 0.0005 0.003 0.014 0.054 0.185 0.64 2.24 5.91 3.85 
(5800) (960) (206) (54) (15.6) (4.5) (1.29) (0.49) 
PO-Systox-sul foxide 0.00018 0.00085 0.0037 0.014 0.051 0.16 0.58 1.48 3.80 
(XXIII) (16000) (3400) (780) = (206) (57) (18) (5.0) (1.95) 
PO-Systox-sulfone (XVII) 0.00018 0.00085 0.0037 0.014 0.050 0.16 0.55 1.49 3.80 
(16000) (3400) (780) (206) (57) (18) (5.0) (1.94) 
PO-Methylsystox (VIII) 0.002 0.008 0.033 0.122 0.385 1.42 4.5 14.2 3.70 
(1450) (360) (88) (25.8) (7.5) (2.03) (0.65) (0.204) 
PO-Methylsystox- 0.0006 0.003 0.0122 0.047 0,16 0.56 1.75 4.75 3.85 
sulfoxide (XXIV) (4800) (970) (236) (61.7) (18) (5.2) (1.65) (0.61) 
PO-Methylsystox-sulfone 0.0006 0.003 0.012 0.047 0.16 0.56 2.17 4.75 3.85 
(XXV) (4800) (970) (236) (61.7) (17) (5.2) (1.33) (0.61) 
Prep. S 481 (XXVI) 0.2 0.6 1.60 4.08 9.86 2.55 
(14.5) (4.8) (1.8) (0.71) (0.293) 
Prep. S 410 (XXVII) 0.00055 0.0027 0.012 0.045 0.162 0.53 1.53 3.94 3.75 
(5200) (1070) (240) (63) (18) (5.5) (1.9) 
