1589-49-7Relevant academic research and scientific papers
Searching for the Ionized Alkene/Alkanol Complexes +./HOCH3> and +./HOCH2CH3>
Cao, J. R.,George, M.,Holmes, John L.
, p. 481 - 485 (1991)
Experiments on a variety of isomeric +. and +. ions have failed to produce direct evidence for the involvement of the complex ions +./HOCH3> and +./HOC2H5>.For the isomers studied, the rearrangements prior to their dissociation of lowest energy requirement (loss of H2O and C2H5., respectively) are proposed to involve distonic and ylid ions.
Synthesis and Catalytic Activity of Niobium-Containing Hexagonal Mesoporous Silica
Liu, Yanyong,Murata, Kazuhisa,Inaba, Megumu
, p. 992 - 993 (2003)
Niobium-containing hexagonal mesoporous silica has been synthesized using n-dodecylamine as a template; the novel material is very active as a catalyst in the epoxidation of propylene with hydrogen peroxide and alkyl peroxides as oxidants.
Hydrogenation of Esters by Manganese Catalysts
Li, Fu,Li, Xiao-Gen,Xiao, Li-Jun,Xie, Jian-Hua,Xu, Yue,Zhou, Qi-Lin
, (2022/01/13)
The hydrogenation of esters catalyzed by a manganese complex of phosphine-aminopyridine ligand was developed. Using this protocol, a variety of (hetero)aromatic and aliphatic carboxylates including biomass-derived esters and lactones were hydrogenated to primary alcohols with 63–98% yields. The manganese catalyst was found to be active for the hydrogenation of methyl benzoate, providing benzyl alcohol with turnover numbers (TON) as high as 45,000. Investigation of catalyst intermediates indicated that the amido manganese complex was the active catalyst species for the reaction. (Figure presented.).
A HPPO by-product recycling synthetic 1, 3 - propanediol (by machine translation)
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Paragraph 0036-0041, (2019/07/04)
The invention belongs to the technical field of organic chemical industry, relates to a HPPO by-product recycling synthetic 1, 3 - propanediol, more specifically, relates to a propylene HPPO process with methanol the reaction product of propylene glycol monomethyl ether as the raw material, and sequentially passes through the dewatering, borohydrite oxidation, hydrolysis of the three-step reaction synthesizes the high value added 1, 3 - propylene glycol, 1, 3 - propylene glycol total yield of 80% or more, purity 99.5% or more, the invention has the simple process route, rationalization of resources use, 1, 3 - propylene glycol yield and purity and the like. (by machine translation)
Method for preparing 1,3-propylene glycol by means of methyl 3-methoxypropionate
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Page/Page column 4-6, (2018/10/11)
The invention provides a method for preparing 1,3-propylene glycol by means of methyl 3-methoxypropionate, and relates to the field of chemical synthesis. Aiming at the problems that for an existing method, the technology condition is high, a reaction is harsh, and operation is complex, methyl 3-methoxypropionate serves as the main raw material, methyl 3-methoxypropionate is obtained through a hydrogenation reaction, demethylation is conducted, and reaction is conducted with hydroiodic acid, a target product 1,3-propylene glycol and methyl iodide are obtained, methyl iodide is subjected to catalytic cracking finally, and hydroiodic acid is obtained, wherein hydroiodic acid is reused in the demethylation process. For the whole scheme, the synthetic route is short, reaction selectivity is good, the cost is low, the yield is high, the quality is high, raw material resources are simple, the method does not refer to high temperature and high pressure, the technology is safe and reliable, operability is high, and the influence on the environment is low.
CONTROLLED RELEASE PREPARATION
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Paragraph 0529; 0530, (2016/06/06)
A controlled release preparation wherein the release of active ingredient is controlled, which releases an active ingredient for an extended period of time by staying or slowly migrating in the gastrointestinal tract, is provided by means such as capsulating a tablet, granule or fine granule wherein the release of active ingredient is controlled and a gel-forming polymer. Said tablet, granule or fine granule has a release-controlled coating-layer formed on a core particle containing an active ingredient.
Replacing phosphorus with sulfur for the efficient hydrogenation of esters
Spasyuk, Denis,Smith, Samantha,Gusev, Dmitry G.
supporting information, p. 2538 - 2542 (2013/04/10)
Catalyst tune-up: A readily available, air-stable amino-sulfide catalyst, [RuCl2(PPh3){HN(C2H4SEt) 2}], has been developed. This complex displays outstanding efficiency for the hydrogenation of a broad range of substrates with C-X bonds (esters, ketones, imines), as well as for the acceptorless dehydrogenative coupling of ethanol to ethyl acetate (see scheme). Copyright
Catalytic hydrogenation of esters. Development of an efficient catalyst and processes for synthesising (R)-1,2-propanediol and 2-(l-Menthoxy)ethanol
Kuriyama, Wataru,Matsumoto, Takaji,Ogata, Osamu,Ino, Yasunori,Aoki, Kunimori,Tanaka, Shigeru,Ishida, Kenya,Kobayashi, Tohru,Sayo, Noboru,Saito, Takao
experimental part, p. 166 - 171 (2012/05/20)
A ruthenium catalyst for the reduction of esters by hydrogenation has been developed. Processes for the hydrogenation of esters have also been developed for (R)-1,2-propanediol and 2-(l-menthoxy)ethanol. The catalyst shows good catalytic activity for the hydrogenation of esters in methanol. Methyl lactate was reduced at 30 °C and gave turnover numbers (TON) up to 4000. The optical purity of the (R)-1,2-propanediol made by the hydrogenation of methyl (R)-lactate was higher than that via the asymmetric hydrogenation of hydroxyacetone. A hydrogenation process to replace the lithium aluminum hydride (LAH) reduction used in the production of 2-(l-menthoxy)ethanol was developed.
PROCESS FOR THE PREPARATION OF (2S,4S,5S,7S)-N-(2-CARBAMYL-2- METHYLPROPYL)-5-AMINO-4-HYDROXY-2,7-DIISOPROPYL-8-[4-METHOXY-3-(3- METHOXYPROPOXY)PHENYL]-OCTANAMIDE HEMIFUMARATE AND ITS INTERMEDIATES THEREOF
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Page/Page column 57-58, (2011/12/14)
The present invention relates to a process for the preparation of (2S,4S,5S,7S)-N-(2- Carbamoyl-2-methylpropyl)-5-amino-4-hydroxy-2,7-diisopropyl-8-[4-methoxy-3-(3-methoxy propoxy )phenyl]-octanamide compound of formula- 1 and its pharmaceutically acceptable salts thereof. Further, relates to the processes for the preparation of (R)-4-(2-(halomethyl)-3- methylbutyl)-l-methoxy-2-(3-methoxypropoxy) benzene and (R)-2-(4-methoxy-3-(3-methoxy propoxy) benzyl)-3-methyIbutan-l-ol useful intermediates in the synthesis of compound of formula- 1.
INTERMEDIATE COMPOUND OF TECHNETIUM NITRIDE COMPLEX FOR RADIODIAGNOSTIC IMAGING
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Page/Page column 6, (2010/07/04)
A bisphosphonoaminc compound represented by the following formula (I): wherein R1, R2, R3, R4 and R5 are independently an alkyl group having 1 to 6 carbon atoms, and n is an integer of 1 to 6, is extremely useful as an intermediate for preparing a technetium nitride complex for radiodiagnostic imaging.
