Magnesium dicarboxylates promote the prenylation of phenolics that is extended to the total synthesis of icaritin
作者:Jichao Zhang、Wei Xiong、Yongju Wen、Xuewen Fu、Xiaoxia Lu、Guolin Zhang、Chun Wang
DOI:10.1039/d1ob02228h
日期:——
study of the prenylation provided evidence for the nucleophilic addition/substitution of the phenolic substrate to the alkyl halide in the presence of the magnesium dicarboxylates. The proto application of this method in the total synthesis of icaritin through the prenylation of 2,4,6-trihydroxyacetophenone, followed by the reaction with benzaldehyde to afford the flavonol, was successful, with a total
The invention provides a method for preparing a succinic acid, which method includes the steps of: providing magnesium succinate; acidifying the magnesium succinate with hydrochloric acid (HCl), thereby obtaining a solution including succinic acid and magnesium chloride (MgCl
2
); optionally a concentration step, wherein the solution including succinic acid and MgCl
2
is concentrated; precipitating succinic acid from the solution including succinic acid and MgCl
2
, thereby obtaining a succinic acid precipitate and a MgCl
2
solution. The addition of HCl to a magnesium salt of succinic acid and subsequent precipitation of succinic acid from the solution leads to a very efficient separation of succinic acid from a magnesium succinate solution.
The production of organic acids in low-cost, high-efficiency fermentation system makes available a new route to chemical production from biomass. A process for producing a hydrogenation product involving carboxylic acid esters recovered directly from a fermentation process is described.
[EN] CARBOXYLIC ACID RECOVERY FROM MAGNESIUM CARBOXYLATE MIXTURE<br/>[FR] RÉCUPÉRATION D'ACIDE CARBOXYLIQUE À PARTIR D'UN MÉLANGE DE CARBOXYLATE DE MAGNÉSIUM
申请人:PURAC BIOCHEM BV
公开号:WO2013174911A1
公开(公告)日:2013-11-28
The invention is directed to a method for recovering carboyxlic acid from an magnesium carboxylate containing aqueous mixture comprising, comprising the steps of - contacting the aqueous mixture with an acidic ion exchanger, thereby forming a carboxylic acid mixture and ion exchanger loaded with magnesium ions; and - contacting the ion exchanger loaded with magnesium ions with a hydrochloric acid solution, thereby forming a magnesium chloride solution; and - thermally decomposing the magnesium chloride solution a temperature of at least 300 °C, thereby forming magnesium oxide (MgO) and hydrogen chloride (HC1).
[EN] PROCESS FOR MANUFACTURING SUCCINIC ACID<br/>[FR] PROCÉDÉ DE PRÉPARATION D'ACIDE SUCCINIQUE
申请人:PURAC BIOCHEM BV
公开号:WO2011098598A1
公开(公告)日:2011-08-18
The present invention discloses a Process for the preparation of succinic acid comprising the steps of : a) providing an aqueous medium comprising magnesium succinate by fermentation, wherein a carbohydrate source is fermented by means of a micro-organism to form succinic acid, a magnesium base being added as neutralising agent during fermentation to provide the magnesium succinate; b) subjecting the aqueous medium comprising magnesium succinate to a crystallisation step and a salt exchange step to provide an aqueous solution comprising a monovalent succinate salt, wherein the salt exchange, which is performed either prior to or after crystallisation, comprises treating the magnesium succinate with a monovalent base to provide a magnesium base and the monovalent succinate salt; c) adjusting the concentration of the monovalent succinate salt in the aqueous solution to a value between 10 and 35 wt.%; d) subjecting the aqueous solution comprising the monovalent succinate salt to water-splitting electrodialysis, to produce a first solution comprising monovalent base and a second solution comprising succinic acid and monovalent succinate salt, the electrodialysis being carried out to a partial conversion of 40 to 95 mole%; e) separating the second solution comprising succinic acid and monovalent succinate salt into succinic acid and a solution comprising the monovalent succinate salt by crystallisation; f) recycling the solution of step e) comprising the monovalent succinate salt to step d).