[EN] RUTHENIUM OLEFIN METATHESIS CATALYSTS BEARING N-HETEROCYCLIC CARBENE LIGANDS WITH SUBSTITUTED BACKBONE [FR] CATALYSEURS DE MÉTATHÈSE D'OLÉFINES À BASE DE RUTHÉNIUM PORTANT DES LIGANDS CARBÈNES N-HÉTÉROCYCLIQUES À SQUELETTE SUBSTITUÉ
[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).
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 generally to olefin metathesis, more particularly, to tri- or tetra-substituted imidazolinium salts which are precursors to N-heterocyclic carbene (NHC) ligands with tri- or tetra-substituted imidazolinium rings, organometallic ruthenium complexes comprising gem di-substituted imidazolinium NHC ligands, organometallic ruthenium complexes comprising tri- or tetra-substituted imidazolinium NHC ligands, and to olefin metathesis methods using them. The catalysts and methods of the invention have utility in the fields of catalysis, organic synthesis, and industrial chemistry.
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).