摘要:
Provided is a production method whereby corresponding carboxylic acid anhydrides and carboxylic acid esters can be obtained at high yield from various carboxylic acids even without a solvent and near room temperature. A method for producing a carboxylic acid anhydride represented by formula (II), the method comprising reacting a compound represented by formula (I) and a carboxylic acid in the presence of a Group II metal compound having an ionic ligand containing an oxygen atom. A method for producing a carboxylic acid ester, the method comprising reacting a carboxylic acid anhydride produced by the aforementioned method and an alcohol. In formula (I), R 1 represents a C1-20 hydrocarbon group. In formula (II), R 2 represents a C1-20 hydrocarbon group.
摘要:
Process for halogenating carboxylate compounds having at least one reactive alpha hydrogen substituent, comprising contacting said carboxylate compound with a halogen or halogen source in the presence of an effective amount of a cyanoquinone compound and acidic auxiliary agent, a catalyse system comprising the cyanoquinone material and the acidic auxiliary agent, and a halogenation medium comprising a halogen, selected from chlorine and bromine and a catalyst system comprising a cyanoquinone material and an acidic auxiliary agent.
摘要:
Carboxylic acids can be prepared by reacting compounds comprising a -CCl 2 F group, a CCIF 2 group or a CCl 3 group with sulfur trioxide and sulfuric acid. The reaction is especially suitable for the preparation of 3,3,3-trifluoropropionic acid from CF 3 -CH 2 -CCl 2 F, CF 3 -CH 2 -CCIF 2 , CF 3 -CH 2 -CCl 3 or a mixture of one or two thereof as starting material. Usually, oleum is used as the source for sulfur trioxide. In a preferred embodiment, the starting material comprises CF 3 -CH 2 -CCl 2 F and/or CF 3 -CH 2 -CCIF 2 which is or are prepared in a fluorination reaction between CCl 3 -CH 2 -CCl 3 and HF. As a source for CCl 3 -CH 2 -CCl 2 , the product of the reaction between CH 2 =CCl 2 and CCl 4 is advantageously used.
摘要:
A new synthesis of ω-hydroxy acids, which employs commercially available starting materials and lowers the cost of production. The process involves coupling a fatty acyl group by enamine chemistry, followed by a ring expansion and selective reduction of ketoacid.