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US 4,786,739 AGranted
Substituted benzopentathiepins, process therefor and intermediates
AssigneeE. I. DuPont de Nemours and Company
InventorBertrand L. Chenard
Life of this patent
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Abstract
Substituted benzopentathiepins, their preparation from 1,2,3-benzothiadiazoles and elemental sulfur, selected 1,2,3-benzothiadiazoles; the benzopentathiepins being useful as biologically active compounds or as intermediates to 1,2-benzenedithiols.
Claims9
A method for making compounds of the formula ##STR28## wherein R.sup.1, R.sup.2 and R.sup.3 are the same or different substituents that do not react with sulfur at reaction temperatures and are selected from H, X, CX.sub.3, NO.sub.2, SR.sup.4, OR.sup.4, NR.sub.2.sup.4, ##STR29## aryl and substituted aryl;
- R.sup.4 is selected from aryl, substituted aryl, and substituted and unsubstituted branched or straight chain C.sub.1 to C.sub.6 alkyl;
- the substituents employed in the substituted aryl of R.sup.1 to R.sup.3 and in the substituted aryl and alkyl of R.sup.4 are selected from the group X, CX.sub.3, OR, SR, ##STR30## and COOR wherein R is aryl or C.sub.1 to C.sub.4 alkyl;
- and X is selected from Cl, Br and F;
- comprising reacting a benzothiadiazole of the formula ##STR31## with S.sub.8 at a temperature of about 140.degree. to 200.degree. C. in a solvent inert to S.sub.8 at a molar ratio of S.sub.8 to benzothiadiazole of about 1:2 to 2:1.
1 more element
Dependencies are inferred from the claim text.