SULFONATION OF ARYLAMINES .6. THERMAL-DECOMPOSITION OF RING-SUBSTITUTED ARYLAMMONIUM SULFATES

Ring-substituted arylammonium sulfates (RSAS) having electron donating or attracting substituents have been prepared and characterized. Ther mal decomposition studies were carried out by TG, DTG and DTA techniqu es. Log k and decomposition temperatures (T-d) were found to have a li near relationship with pK(a) values of the corresponding arylamine. Ha mmett equation gave positive value of p (Hammett substituent constant) , which indicates that the decomposition is facilitated by electron de manding substituents. The proton transfer process seems to be the prim ary rate controlling step in the decomposition of these sulfates. (C) 1997 Elsevier Science B.V.