I. Okabayashi, H. Fujiwara, C. Tanaka
Dec 1, 1991
Citations
0
Influential Citations
6
Citations
Journal
Journal of Heterocyclic Chemistry
Abstract
Cyclization of 2-chloro-6-[(3-chlorophenyl)thio]benzoic acid (2) gave a mixture of 1,8-, 3, and 1,6-dichloro-9H-thioxanthen-9-ones 4. The mixture was converted to 1,8-diamino- 7, and 1-amino-6-chloro-9H-thioxanthen-9-ones 8, from which 3 and 4 were prepared separately, respectively. From a mixture of 4 and 3,6-dichloro-9H-thioxanthen-9-one (11) obtained by cyclizing 4-chloro-2-[(3-chlorophenyl)thio]benzoic acid (10) was separated 11 by conversion of 4 to 8.