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38 results about "Sulfanyl" patented technology

Sulfanyl (HS•), also known as the mercapto radical, hydrosulfide radical, or hydridosulfur, is a simple radical molecule consisting of one hydrogen and one sulfur atom. The radical appears in metabolism in organisms as H₂S is detoxified. Sulfanyl is one of the top three sulfur-containing gasses in gas giants such as Jupiter and is very likely to be found in brown dwarfs and cool stars. It was originally discovered by Margaret N. Lewis and John U. White at the University of California in 1939. They observed molecular absorption bands around 325 nm belonging to the system designated by ²Σ⁺ ← ²Πᵢ. They generated the radical by means of a radio frequency discharge in hydrogen sulfide. HS• is formed during the degradation of hydrogen sulfide in the atmosphere of the Earth. This may be a deliberate action to destroy odours or a natural phenomenon.

Method for preparing the enantiomerized concentrated form of 2-[2-(2-chlorothiazol-5-yl)-2-hydroxyethyl]sulfanyl-6-hydroxy-3-methyl-5-phenylpyrimidine-4-one

The present invention relates to a process for preparing 2-[2-(2-chlorothiazol-5-yl)-2-hydroxy-ethyl]sulfanyl-6-hydroxy-3-methyl-5-phenyl-pyrimidin-4-one or its tautomers or enantiomerically enriched forms thereof, to 2-[2-(2-chlorothiazol-5-yl)-2-hydroxy-ethyl]sulfanyl-6-hydroxy-3-methyl-5-phenyl-pyrimidin-4-one or its tautomers or enantiomerically enriched forms thereof and to its use as an intermediate in the preparation of 2,3-dihydrothiazolo[3,2-a]pyrimidinium compounds, in particular 3-(2-chlorothiazol-5-yl)-8-methyl-7-oxo-6-phenyl-2,3-dihydrothiazolo[3,2-a]pyrimidin-4-ium-5-olate and its enantiomerically enriched forms.
Owner:BASF SE

Preparation method of reversible addition fragmentation chain transfer reagent

The invention belongs to the field of RAFT reagent synthesis, and particularly relates to a preparation method of a reversible addition fragmentation chain transfer reagent. Comprising the following steps: by taking dodecyl mercaptan as a starting raw material, generating thiolate under the action of alkali; and reacting the obtained thiolate with carbon disulfide (CS2) to generate trithiocarbonate. And reacting the obtained trithiocarbonate with trichloromethane and acetone under the catalysis of alkali, and finally acidifying to obtain 2-[dodecyl sulfenyl (thiocarbonyl) sulfenyl]-2-methyl propionic acid, namely the RAFT reagent. Tetrabutylammonium bromide is specifically selected as a phase transfer catalyst, and the catalyst system provided by the invention can realize higher product yield.
Owner:XINXIANG RICHFUL LUBE ADDITIVE CO LTD