Disclosed is a process for preparing a diaryl oxalate which comprises the step of transesterifying a dialkyl oxalate or/and an alkylaryl oxalate with an aryl alcohol in the presence of a tetra(aryloxy)titanium as a catalyst, wherein the tetra(aryloxy)titanium is fed into a reaction system of the transesterification as an aryl alcohol solution of the tetra(aryloxy)titanium which is prepared by reacting a tetraalkoxy titanium and an excess amount of the aryl alcohol and removing a by-producing alkyl alcohol.
A catalyst composed of an organic phosphorus compound having a trivalent or pentavalent phosphorus atom and at least one carbon-phosphorus bonding or a combination of the organic phosphorus compound and a halogen atom-containing compound is effective for decarbonylation, that is, for releasing carbon monoxide from a compound containing a moiety of -CO-CO-O- in its molecular structure.
[EN] CATALYSTS FOR MAKING ACRYLIC ACID FROM LACTIC ACID OR ITS DERIVATIVES IN LIQUID PHASE<br/>[FR] CATALYSEURS POUR LA FABRICATION D'ACIDE ACRYLIQUE À PARTIR D'ACIDE LACTIQUE OU DE SES DÉRIVÉS EN PHASE LIQUIDE
申请人:PROCTER & GAMBLE
公开号:WO2018022828A1
公开(公告)日:2018-02-01
Catalysts for the dehydration of lactic acid, lactic acid derivatives, or mixtures thereof to acrylic acid, acrylic acid derivatives, or mixtures thereof in liquid phase comprising an ionic liquid (IL) and an acid are provided.
[EN] METHODS OF MAKING ACRYLIC ACID FROM LACTIC ACID OR ITS DERIVATIVES IN LIQUID PHASE<br/>[FR] PROCÉDÉS DE FABRICATION D'ACIDE ACRYLIQUE À PARTIR D'ACIDE LACTIQUE OU DE SES DÉRIVÉS EN PHASE LIQUIDE
申请人:PROCTER & GAMBLE
公开号:WO2018022826A1
公开(公告)日:2018-02-01
Methods for making acrylic acid, acrylic acid derivatives, or mixtures thereof by contacting a feed stream containing lactic acid, lactic acid derivatives, or mixtures thereof with a molten salt catalyst comprising an ionic liquid (IL) and an acid in liquid phase are provided.
Palladium-Catalyzed Synthesis of Functionalized Tetraarylphosphonium Salts
作者:David Marcoux、André B. Charette
DOI:10.1021/jo702355c
日期:2008.1.1
An efficient method to synthesize functionalized tetraarylphosphoniumsalts is described. This palladium-catalyzed coupling reaction between aryl iodides, bromides, or triflates and triphenylphosphine generates phosphonium salts in high yields. The coupling is compatible with a variety of functional groups such as alcohols, ketones, aldehydes, phenols, and amides.