Synthesis process for aroamtic dithiol

Abstract

The synthesis of aromatic dithiol includes the following steps: sulfochlorination of aromatic compound diphenyl ether, diphenyl methane, diphenyl sulfide and 1,4-diphenyl or 2,2-diphenyl propane; and the reaction between the sulfuryl chloride compound, zinc as reductant in sulfuric acid or hydrochloric acid medium system at 70-90 deg.c for 1.5-3 hr with the reactant moar ratio of sulfuryl chloride compound to zine powder to sulfuric acid or hydrochloride acid being 1 to 7-15 to 8-30. The process of the present invention has high product yield, no toxic solvent used and low cost, and the new aromatic dithiol products are used as fine chemical intermediate and synthesized material.

Description

technical field [0001] The invention relates to a method for synthesizing aromatic dithiols. technical background [0002] Aromatic dithiophenols are often used as intermediates of fine chemicals such as dyes, medicines, and pesticides. In addition, under the action of oxidizing agents, aromatic dithiophenols can generate cyclic oligomers, which can be processed at lower temperatures than the corresponding polymers, and can be processed without releasing any by-products. Ring-opening polymerization makes macrocyclic polymers potentially useful in many fields such as high-temperature hot-melt adhesives, coatings, and thermoplastic composites. [0003] At present, there are few varieties of aromatic dithiols, and the synthesis of aromatic dithiols reported in the literature adopts a two-step method. First, aromatic compounds are chlorosulfonated and then reduced to give aromatic dithiophenols. The reduction of aromatic compounds by chlorosulfonate...

AI Technical Summary

Problems solved by technology

Due to the use of many toxic reagents in the preparation process, which causes environmental pollution, and the product needs post-treatment to remove pollution, the production cost is high, so the preparation of existing aromatic dithiols is difficult to industrialize