摘要:
The present invention relates to a process for producing a carboxylic acid ester, comprising a step of oxidizing an aldehyde by mixing an alcohol, carbon dioxide, the aldehyde and at least one compound selected from the group consisting of compounds represented by the formulae (2-1) and (2-2): wherein R 2 represents an alkyl group optionally having a substituent or the like; R 3 and R 4 each independently represents an alkyl group optionally having a substituent or the like or R 3 and R 4 are linked together to form a divalent hydrocarbon group optionally having a substituent or the like; Y represents a group of -S- or a group of -N(R 5 )-, wherein R 5 represents an alkyl group optionally having a substituent or the like, or R 5 is linked to R 4 to form a divalent hydrocarbon group optionally having a substituent; and R 8 represents an alkyl group.
摘要:
The invention is a base-modified clay and an improved process for preparing a beta-hydroxy compound via an aldol condensation reaction using the base-modified clay as a catalyst. The base-modified clay comprises a clay having secluded conjugate base sites and exchangeable interstitial cationic spaces. In the base-modified clay, the interstitial hydroxyl groups have been converted to oxide sites, at least one structural hydroxyl group has been converted to an oxide site. The base-modified clay contains sufficient conjugate base cations to balance the charge of said oxide groups. The process for preparing a beta-hydroxy compound includes reacting a first carbonyl compound having at least one alpha hydrogen with a second carbonyl compound in the presence of a catalytic amount of a base-modified clay as described above. The invention also relates to a process for preparing a 1,3-diol comprising the hydrogenation of a beta-hydroxy compound prepared by the process described above. In yet another embodiment, the invention relates to a process for preparing a ketone or an alcohol comprising the dehydration of the above described beta-hydroxy-containing carbonyl compound followed by hydrogenation to produce the ketone. The alcohol is prepared by further hydrogenation of the ketone.
摘要:
The invention relates to a process for preparing monoesters of 1,3-diols. The invention relates to a process for preparing in particular 2,2,4-trimethyl-1,3-pentanediol monoisobutyrate, according to which process isobutyraldehyde is brought into contact with an alkalihydroxide catalyst. The alkali hydroxide catalyst used according to the invention is a dilute solution of lithium hydroxide, in which the concentration of lithium hydroxide is about 1 - 12 % by weight. An aqueous solution containing about 2 - 10 % by weight of sodium hydroxide and about 0.1 - 6 % by weight of lithium hydroxide, is used preferably. This enhances selectivity with respect to 1,3-diols, with an increased conversion of the aldehyde into a monoester and a subsequent decrease in recirculation volumes in the preparation process.
摘要:
Disclosed is a process for the production of 2,6-dimethylhept-5-enal by Baeyer-Villiger oxidation of 3,7-dimethylocta-2,6-dienal in the presence of aqueous H 2 O 2 and SeO 2 , followed by hydrolysis.
摘要翻译:公开了在H 2 O 2和SeO 2水溶液存在下,通过Baeyer-Villiger氧化3,7-二甲基辛-2,6-二烯的2,6-二甲基庚-5-烯醛的方法,然后进行水解。
摘要:
Organometallic complexes characterized by being represented by the general formula (1), which can be advantageously used in the systems of synthesis of carboxylic esters from aldehydes, e.g., Tishchenko’s reaction: (1) wherein M is a metal atom; R is optionally branched C 1−8 alkyl or an aromatic or aralkyl group which may be substituted; L is an organic group which has one or more aromatic rings and can form a ring composed of five to seven members inclusive of X, Y, and M; and X and Y are each independently −O−, −NR 1 −, −N(SO 2 R 2 )−, or the like (with proviso that the cases wherein X and Y are the same are excepted), R 1 being optionally branched C 1−8 alkyl which may be halogenated and R 2 being optionally branched C 1−10 alkyl which may be halogenated.
摘要:
Basic catalysts are prepared from at least one alkali metal compound selected from the group consisting of alkali metal alkoxides, hydroxides and oxides and an alkaline earth metal oxide in a weight ratio of the alkali metal compound to the alkaline earth metal oxide in the range of 0.005/1 to 1/1, and are used for the reaction of aldehydes to form glycol monoesters. Thus, highly active, efficient basic catalysts usable for the aldol reaction or the like to give intended products with a high selectivity are provided.
摘要:
A catalyst and process for preparation of dihydroxy esters from specified hydroxy aldehydes is disclosed. In one embodiment, a catalyst liquid is provided which comprises from 10 percent to 60 percent magnesium salt of a specified alkanoic acid or acids, and from 90 percent to 40 percent of a particular alkanoic acid or acids, the molar ratio of alkanoic acid to magnesium salt being from 1.5 to 20.3. The catalyst solution or liquid contacts or is contacted with a specified hydroxy aldehyde under suitable reaction conditions to form the desired dihydroxy ester. In another embodiment, dihydroxy esters are derived from specified hydroxy aldehydes by first forming a magnesium catalyst containing liquid by reacting magnesium or magnesium oxide, under suitable conditions, with a suitable alkanoic acid or acids, the acid or acids being provided in excess in specified molar ratios. The magnesium salt-alkanoic acid liquid produced is then employed as a catalyst liquid to convert the respective hydroxy aldehyde under suitable reaction conditions to form the desired dihydroxy ester.
摘要:
The invention relates to a novel class of ( S )-3'-substituted-abscisic acid derivatives and (±)-3'-substituted-abscisic acid derivatives, and methods of synthesizing the derivatives.
摘要:
The present invention relates to a method of producing methanol from a methane source by oxidizing methane under conditions sufficient to a mixture of methanol and formaldehyde while minimizing the formation of formic acid and carbon dioxide. The oxidation step is followed by treatment step in which formaldehyde is converted into methanol and formic acid which itself can further be converted into methanol via catalytic hydrogenation of intermediately formed methyl formate.