5 results about "Dithiete" patented technology

This invention relates to a non-natural methionine and its synthesis method, using inexpensive and readily available transition metals as catalysts. N Using arylglycine, styrene compounds, and disulfides as raw materials, a series of non-natural methionine compounds were obtained with high selectivity and high yield through a three-component reaction under mild conditions. The compounds prepared in this invention are multifunctional non-natural methionine derivatives, representing a novel class of natural methionine derivatives. They can be used in drug modification, biosensor fabrication, and other fields, possessing significant research and application value and providing new synthetic strategies for the preparation of novel peptide drugs.

This invention relates to a method for synthesizing aromatic carbon-10 sulfur-containing compounds from isoprene. Specifically, using disulfide, isoprene, and 2-methyl-1-buten-3-yne as raw materials, aromatic carbon-10 sulfur-containing compounds are constructed under cobalt catalyst and iodine tandem catalysis. This invention has the following advantages: the raw materials are simple and readily available, the synthesis is simple, it is environmentally friendly, the conditions are mild, and it has high atom economy. The compounds obtained from the bulk chemical isoprene have structures similar to natural terpenes and represent an important class of terpenes.

This invention relates to a weather-resistant and anti-aging coating for coastal port cranes and its preparation method, belonging to the field of coating materials technology. The coating comprises component A and component B; component A includes an isocyanate-terminated prepolymer, a tri(dibenzoylmethane) ytterbium(III) complex, a spiropyran derivative, and additives; component B is obtained by dissolving isophorone diamine and 2,2'-diaminodiphenyl disulfide in ethyl acetate solvent, with a solid content of 40-60 wt%, and a molar ratio of isophorone diamine to 2,2'-diaminodiphenyl disulfide of (1-4):1; the molar ratio of isocyanate groups in component A to imino groups in component B is (1-1.05):1. This invention accelerates the exchange of dynamic disulfide bonds by constructing a photothermal conversion system, thereby enhancing the coating's ability to dissipate mechanical stress under ultraviolet light irradiation and simultaneously imparting long-term weather resistance to the coating.

The application provides a preparation method of a disulfide pre-sulfurizing agent and application of an amino acid in the method. The amino acid is used as a catalyst, and the disulfide pre-sulfurizing agent with a yield not less than 95% and controllable molecular size can be prepared under normal temperature in an oxygen or air atmosphere. The reaction condition is more moderate, the energy consumption is smaller, the physical hazard is weaker, the health and environmental hazards are lower, and the method is beneficial to the use safety of equipment and prolongs the service life of the equipment in the pre-sulfurization process of a hydrogen sulfide agent.

This invention discloses a method for preparing asymmetric diphenyl sulfide compounds. Disubstituted phenyl disulfide and lithium chloride-containing substituted phenyl magnesium halide (Knochel-type Grignard reagent) are dissolved in an organic solvent, and the reaction is stirred at room temperature while the reaction progress is monitored using gas chromatography. After approximately 2 hours, the reaction proceeds completely. The reaction solution is extracted with ethyl acetate, dried over anhydrous sodium sulfate, and concentrated under reduced pressure to obtain a crude product. Subsequently, the crude product is purified by column chromatography to obtain the desired asymmetric diphenyl sulfide compounds. This method uses disubstituted phenyl disulfide and lithium chloride-containing substituted phenyl magnesium halide (Knochel-type Grignard reagent) as starting materials to synthesize asymmetric diphenyl sulfide compounds. The synthetic route is simple, requires no external transition metal catalyst, exhibits good functional group tolerance, can be scaled up, and is easy for industrial production.