in water byproducts: dimethylaniline; diln. in ice cold ammonia water (10percent NH3/) left warming up to common temps. under sepn. of (CH3)2NC6H5;; evapn. (removal of exceeding NH3 and (CH3)2NC6H5/water bath); addn. of concd. H2SO4; sepn. of HSO3NH2;;

chlorosulfonic acid in 1,2-dichloro-benzene T=40°C; E(activ), oth. temperatures; Rate constant;