701 CORWIK HANSCH, D. G. CROSBY, 5 I r c~z s~ SADOSKI, ALBERT LEO AND DOVGI,AS PERCIVAL Vol. 7 3Anal. Calcd. for CloH130S4Cl: Cl, 14.8. Found: c1, 15.0.Of the two possible isomers, 2-chloro-4-dimethylaminobenzaldehyde had been prEpared before" by an unambiguous synthesis; m. p . 82 . The 3-chloro-compound was synthesized by the following method and was found identical (mixed in. p.'s of the aldehydes and the semicarbazones) with the above substance.o-Chlorodimethylaniline was prepared by heating ochloroaniline (13 g.), methyl alcohol (20 cc.) and concd. sulfuric acid (1 cc.) for 16 hours at 160-170" (sealed tube), addition of alkali, extraction with ether and fractional distil--____