A method for producing an aromatic carbonate, comprising: (1) performing a reaction between an organometal compound and carbon dioxide to obtain a reaction mixture containing a dialkyl carbonate formed by the reaction, (2) separating the dialkyl carbonate from the reaction mixture to obtain a residual liquid, (3) reacting the residual liquid with an alcohol to form at least one organometal compound and form water and removing the water from the organometal compound, and (4) reacting the dialkyl carbonate separated in step (2) with an aromatic hydroxy compound to obtain an aromatic carbonate.
Production of an aromatic carbonic ester through an ester exchange reaction between a starting material and a reactant while distilling by-product alcohols and/or by-product dialkyl carbonates off the reaction system, wherein use is made of a specified catalyst.
The present invention provides a process for the production of an aromatic carbonate, comprising the steps of: continuously feeding an aliphatic carbonate represented by following general formula (1) as a starting material, an aromatic monohydroxy compound represented by following general formula (2) as a reactant, and a metal-containing catalyst into a stage above the bottom of a first multi-stage distillation column so as to bring about reaction; continuously withdrawing from the reaction system in a gaseous form a low boiling point component containing an alcohol by-produced in the reaction; and continuously withdrawing from a lower portion of the column in a liquid form an aromatic carbonate represented by following general formula (3) obtained from the starting material and the reactant
Ar
1
OH (2)
wherein R
1
in general formulae (1) and (2) represents an aliphatic group having 4 to 6 carbon atoms, and Ar
1
represents an aromatic group having 5 to 30 carbon atoms
wherein R
2
and Ar
2
in general formulae (3) are the same as R
1
and Ar
1
in the starting material and the reactant, respectively.
TRIOXANE DIMERS HAVING HIGH ANTICANCER AND LONG-LASTING ANTIMALARIAL ACTIVITIES
申请人:Posner Gary H.
公开号:US20090291923A1
公开(公告)日:2009-11-26
The invention provides novel trioxane dimers having formulae III, IV or V: methods for their preparation, pharmaceutical compositions containing these compounds, and methods for treating cancer and/or malaria using these compounds and compositions.