[EN] PROCESS FOR PRODUCING ALPHA-KETOCARBOXYLIC ACID<br/>[FR] PROCÉDÉ DE PRÉPARATION D'ACIDE ALPHA-CÉTOCARBOXYLIQUE
申请人:SUMITOMO CHEMICAL CO
公开号:WO2011162404A1
公开(公告)日:2011-12-29
The present invention relates to a process for producing an α-ketocarboxylic acid, comprising a step of oxidizing an α-ketoaldehyde by mixing a base, carbon dioxide, the α-ketoaldehyde and a compound represented by formula (2-1).
[EN] PROCESS FOR PRODUCING CARBOXYLIC ACID ESTER<br/>[FR] PROCÉDÉ DE PRODUCTION D'UN ESTER D'ACIDE CARBOXYLIQUE
申请人:SUMITOMO CHEMICAL CO
公开号:WO2012176930A1
公开(公告)日:2012-12-27
An object of the present invention is to provide a new process which can produce a carboxylic acid ester from an aldehyde. The object is achieved by a process for producing a carboxylic acid ester, including the step of mixing a compound represented by the formula (2-1): (wherein R2 represents an alkyl group optionally having a substituent, or the like; R3 and R4 each represent independently an alkyl group optionally having a substituent, or the like, or R3 and R4 are taken together to form a divalent hydrocarbon group optionally having a substituent, or the like; Y represents a group represented by -S- or a group represented by -N(R5)-; R5 represents an alkyl group optionally having a substituent, or the like, or R5 is taken together with R4 to form a divalent hydrocarbon group optionally having a substituent; and X- represents an anion), a base, an alcohol, oxygen and an aldehyde to oxidize the aldehyde.
A novel method for producing methionine without using hydrogen cyanide as a raw material has been demanded. A method for producing methionine including a step A of oxidizing 4-methylthio-2-oxo-1-butanal in the presence of an alcohol; a step B of hydrolyzing a 4-methylthio-2-oxo-butanoic acid ester obtained in the step A; and a step C of subjecting 4-methylthio-2-oxo-butanoic acid obtained in the step B to reductive amination.
This invention relates to olefin metathesis catalysts general formula (I):
having a thiazol-2-ylidene ligand of general formula (II):
The catalysts have been found to be particularly good initiators of (a) ring-closing metathesis reactions used to prepare tetra-substituted cyclic olefins, and (b) cross-metathesis reactions used to prepare tri-substituted and di-substituted olefins.
The present invention relates to a process for producing an α-ketocarboxylic acid, comprising a step of oxidizing an α-ketoaldehyde by mixing a base, carbon dioxide, the α-ketoaldehyde and a compound represented by formula (2-1).