摘要:
Disclosed are a method for preparing chlorohydrins and a method for preparing epichlorohydrin using chlorohydrins prepared thereby. The disclosed method for preparing chlorohydrins reacts polyhydroxy aliphatic hydrocarbon with a chlorination agent in the presence of a catalyst, and comprises at least one combination of a series of unit operations including a first reaction step, a water removal step, and a second reaction step, in the respective order, wherein the water removal step is implemented by performing a distillation operation on a reaction mixture having a specific content ratio by using the difference in boiling points between the constituents of the reaction mixture. The disclosed method for preparing epichlorohydrin includes a step for reacting the chlorohydrins, which was prepared using the method for preparing chlorohydrins, with an alkaline chemical.
摘要:
클로로히드린류 조성물의 제조방법 및 그 방법에 의해 제조된 클로로히드린류 조성물을 사용하는 에피클로로히드린의 제조방법이 개시된다. 개시된 클로로히드린류 조성물의 제조방법은, 촉매의 존재하에 다수산기 지방족 탄화수소를 염소화제와 반응시키는 것으로, 제1 반응단계, 물 제거 단계 및 제2 반응단계를 상기 순서로 포함하는 일련의 단위조작들의 조합을 적어도 하나 포함하며, 상기 복수의 반응단계들 중 최종 반응단계에서 배출된 반응 혼합물을 정제하여 얻는 클로로히드린류 농축물을 상기 물 제거 단계에서 배출된 물-풍부층과 혼합하는 단계를 추가로 포함한다. 개시된 에피클로로히드린의 제조방법은 상기 클로로히드린류 조성물의 제조방법에 의해 제조된 클로로히드린류 조성물을 알칼리제와 접촉시키는 단계를 포함한다.
摘要:
Disclosed is: a novel, simple and low-cost method for preparing 3-hydroxy-4-(2,4,5-trifluorophenyl)-butyric acid, particularly (3S)-3-hydroxy-4-(2,4,5-trifluorophenyl)-butyric acid, which is used as a key intermediate in the preparation of sitagliptin.
摘要:
A process for stereoselective synthesis of a compound of Formula (X) or Formula (X') : wherein: R 1 is an aryl group substituted with one to three substituent groups, wherein each substituent group of R 1 is independently C 1 -C 5 alkyl, C 2 -C 5 alkenyl, C 2 - C 5 alkynyl, C 1 -C 5 alkoxy, C 1 -C 5 alkoxycarbonyl, aminocarbonyl, alkylaminocarbonyl, dialkylaminocarbonyl, C 1 -C 5 alkoxycarbonylamino, aminosulfonyl, C 1 -C 5 alkylaminosulfonyl, C 1 -C 5 dialkylaminosulfonyl, halogen, hydroxy, carboxy, cyano, trifluoromethyl, trifluoromethoxy, nitro, or C 1 -C 5 alkylthio wherein the sulfur atom is oxidized to sulfoxide or sulfone, and R 2 and R 3 are each independently hydrogen or C 1 -C 5 alkyl.
摘要:
Manufacture of dichloropropanol Process for manufacturing dichloropropa nol wherein a glycerol-based product comprising at least one diol containi ng at least 3 carbon atoms other than 1,2- propanediol, is reacted with a chlorinati ng agent, and of products derived from dichloropropanol such as ep ichlorohydrin and epoxy resins. No figure.
摘要:
The invention relates to the stereoselective epoxidation of α,β-unsaturated ketones bearing electron withdrawing substituents and to chiral 5-phenyl-4,5-dihydropyrazoles obtained therefrom.
摘要:
The invention relates to the stereoselective epoxidation of a,ß-unsaturated ketones bearing electron withdrawing substituents and to chiral 5-phenyl-4,5-dihydropyrazoles obtained therefrom.
摘要:
The invention concerns a method for making an epoxy including at least one step of purifying the formed epoxy, the epoxy being at least partly made by a method for dehydrochlorinating chlorhydrine, the latter being at least partly made from a method for chlorinating a polyhydroxylated aliphatic hydrocarbon, a polyhydroxylated aliphatic hydrocarbon ester, or a mixture thereof.