4,5-dichloro-2-N-methylbenzene-1,2-diamine

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A solution of 2.7 g. of N-methyl-4,5-dichloro-o-phenylenediamine and 1.85 g. of methyl tetrahydro-4-oxo-3-thiophenecarboxylate in 150 ml. of toluene is heated under reflux for 3 hours during which 100 ml. of distillate is collected in a Dean-Stark trap. The solution is cooled and the solid which separates is recrystallized from ethyl acetate to give yellow crystals, m.p. 281°-283° C. under reflux for 3 hours during which 100 ml of distillate is collected in a Dean-Stark trap The solution is cooled the solid which separates is recrystallized from ethyl acetate to give yellow crystals, m.p. 281°-283° C.

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A solution of 2.7 g. of N-methyl-4,5-dichloro-o-phenylenediamine and 1.85 g. of methyl tetrahydro-4-oxo-3-thiophenecarboxylate in 150 ml. of toluene is heated under reflux for 3 hours during which 100 ml. of distillate is collected in a Dean-Stark trap. The solution is cooled and the solid which separates is recrystallized from ethyl acetate to give yellow crystals, m.p. 281°-283° C. under reflux for 3 hours during which 100 ml of distillate is collected in a Dean-Stark trap The solution is cooled the solid which separates is recrystallized from ethyl acetate to give yellow crystals, m.p. 281°-283° C.

Conditions: temp:20.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A solution of (4,5-dichloro-2-nitrophenyl)methylamine (500 mg) in acetic acid (7.5 ml) is treated portionwise with zinc powder (740 mg). The reaction medium is stirred at ambient temperature (20° C.) until complete reduction. Water (13 ml) and 28% ammonia are added to pH 7, and then the reaction medium is depleted using ethyl acetate (3×50). The organic extracts are combined, dried over magnesium sulphate, filtered and evaporated under reduced pressure. The oil obtained is taken up in ether (50 ml) and then 2N HCl is added thereto. The solid formed is filtered off. 4,5-Dichloro-N-methylbenzene-1,2-diamine is isolated in its hydrochloride form (510 mg), and is used in the next state. dried over magnesium sulphate filtered evaporated under reduced pressure The oil obtained The solid formed is filtered off

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A solution of 2.7 g. of N-methyl-4,5-dichloro-o-phenylenediamine and 1.85 g. of methyl tetrahydro-4-oxo-3-thiophenecarboxylate in 150 ml. of toluene is heated under reflux for 3 hours during which 100 ml. of distillate is collected in a Dean-Stark trap. The solution is cooled and the solid which separates is recrystallized from ethyl acetate to give yellow crystals, m.p. 281°-283°C. under reflux for 3 hours during which 100 ml of distillate is collected in a Dean-Stark trap The solution is cooled the solid which separates is recrystallized from ethyl acetate to give yellow crystals, m.p. 281°-283°C.

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A solution of 2.7 g. of N-methyl-4,5-dichloro-o-phenylenediamine and 1.85 g. of methyl tetrahydro-4-oxo-3-thiophenecarboxylate in 150 ml. of toluene is heated under reflux for 3 hours during which 100 ml. of distillate is collected in a Dean-Stark trap. The solution is cooled and the solid which separates is recrystallized from ethyl acetate to give yellow crystals, m.p. 281°-283° C. under reflux for 3 hours during which 100 ml of distillate is collected in a Dean-Stark trap The solution is cooled the solid which separates is recrystallized from ethyl acetate to give yellow crystals, m.p. 281°-283° C.