The invention relates to new processes to prepare low odor dialkyl sulfides, the low odor dialkyl sulfides obtainable by these processes and to methods of using these low odor dialkyl sulfides. Moreover, the invention relates to a process to prepare dialkyl sulfide borane complexes of high purity, t
The invention relates to new processes to prepare low odor dialkyl sulfides, the low odor dialkyl sulfides obtainable by these processes and to methods of using these low odor dialkyl sulfides. Moreover, the invention relates to a process to prepare dialkyl sulfide borane complexes of high purity, the dialkyl sulfide borane complexes obtainable by this process and to a process for enantioselective reductions employing these dialkyl sulfide borane complexes of high purity as reducing agent.
대표청구항▼
1. A process to purify a dialkyl sulfide comprising bringing a dialkyl sulfide into contact with a metal alcoholate and with at least one alkali or alkaline earth metal. 2. The process of claim 1, wherein the dialkyl sulfide is dimethyl sulfide, diethyl sulfide, methyl ethyl sulfide, methyl isopropy
1. A process to purify a dialkyl sulfide comprising bringing a dialkyl sulfide into contact with a metal alcoholate and with at least one alkali or alkaline earth metal. 2. The process of claim 1, wherein the dialkyl sulfide is dimethyl sulfide, diethyl sulfide, methyl ethyl sulfide, methyl isopropyl sulfide or thioxane. 3. The process of claim 1, wherein the dialkyl sulfide is brought into contact with potassium tert.-butoxide and a sodium-potassium alloy. 4. The process of claim 1, wherein the dialkyl sulfide is brought into contact with at least one metal alcoholate and with at least one alkali or alkaline earth metal simultaneously in one step. 5. A process to purify a dialkyl sulfide comprising the steps of a) bringing a dialkyl sulfide into contact with at least one base and/or at least one alkali or alkaline earth metal, wherein the base is a metal alcoholate, a metal oxide, a metal hydroxide, alkylammonium hydroxide, a metal carbonate, alkylammonium carbonate, a metal enolate, a metal amide or a metal hydride, wherein the metal is an alkali metal, an alkaline earth metal or a metal of the groups IIIa to VIIIa, Ib and IIb of the periodic table of elements, andb) reacting the product of step a) with an alkyl or benzyl halide, andc) distilling out the dialkyl sulfide. 6. The process of claim 5, wherein the dialkyl sulfide is brought into contact in step a) with a metal alcoholate and optionally with at least one alkali or alkaline earth metal. 7. The process of claim 3, wherein the dialkyl sulfide is dimethyl sulfide, diethyl sulfide, methyl ethyl sulfide, methyl isopropyl sulfide or thioxane. 8. The process of claim 6, wherein the dialkyl sulfide is dimethyl sulfide, diethyl sulfide, methyl ethyl sulfide, methyl isopropyl sulfide or thioxane. 9. The process of claim 8, wherein the dialkyl sulfide is brought into contact with potassium tert.-butoxide and a sodium-potassium alloy. 10. The process of claim 5, wherein said dialkyl sulfide used as a starting material has a purity of at least 95 wt. %. 11. The process of claim 9, wherein said dialkyl sulfide used as a starting material has a purity of at least 99 wt. %. 12. The process of claim 5, wherein said dialkyl sulphide and the at least one base and or at least one alkali or alkaline earth metal are brought into contact for a time in the range between 1 minute and 3 hours. 13. The process of claim 11, wherein said dialkyl sulphide and the at least one base and or at least one alkali or alkaline earth metal are brought into contact for a time in the range between 1 minute and 3 hours. 14. The process of claim 5, wherein the dialkyl sulfide is dimethyl sulphide.
연구과제 타임라인
LOADING...
LOADING...
LOADING...
LOADING...
LOADING...
이 특허에 인용된 특허 (18)
Erickson Donald C. (1704 S. Harbor La. Annapolis MD 21401), Combustion gas desulfurization.
Ito Yoshinao,JPX ; Yasuda Kazuo,JPX ; Shimonishi Shougo,JPX, Method for purification of alpha-olefins for polymerization use and method for production of poly-alpha-olefins.
van Velzen Daniel (Brebbia ITX) Langenkamp Heinrich (Cadrezzate ITX), Method for the removal of hydrogen sulfide and/or carbon disulfide from waste gases.
Vansant Etienne (Zoersel BEX) Peeters Guido (Antwerp BEX) de Bievre Paul (Kasterlee BEX) van Gompel Remi (Geel BEX), Process for selective adsorption of sulfur compounds from gaseous mixtures containing mercaptans.
※ AI-Helper는 부적절한 답변을 할 수 있습니다.