4824-76-4

Upstream product

• 1885-14-9 phenyl chloroformate 
• 71-36-3 butan-1-ol 
• 38064-07-2 phenyl N-hydroxycarbamate 
• 592-34-7 carbonochloridic acid, butyl ester 
• 542-52-9 Dibutyl carbonate 
• 108-95-2 phenol 
• 2273-51-0 diphenyltin(IV) oxide 
• 4525-32-0 dibutyl dicarbonate 
• 109-65-9 1-bromo-butane 
• 124-38-9 carbon dioxide 
• 3349-36-8 di-n-butyl-di(n-butyloxy)tin 
• 89798-55-0 Butyloxycarbonylthiocyanat 
• 139-02-6 sodium phenoxide 
• 39142-48-8 n-butoxycarbonyl isothiocyanate 

Downstream Products

• 27000-74-4 butyl piperidine-1-carboxylate 
• 108-95-2 phenol 
• 124-38-9 carbon dioxide 
• 71-36-3 butan-1-ol 
• 27000-73-3 butyl-N,N-dibutylurethane 
• 77531-65-8 n-butyl N,N-diethylcarbamate 
• 13105-52-7 n-butylcarbamic acid n-butyl ester 
• 102-09-0 bis(phenyl) carbonate 
• 7304-97-4 n-butyl N,N-dimethylcarbamate 
• 27095-02-9 hydroxyethyl carbamic acid butyl ester 
• 17671-80-6 butyl N-cyclohexylcarbamate 
• 1071-66-5 n-butyl n-octylcarbamate 

Relevant academic research and scientific papers

The Guanidine-Promoted Direct Synthesis of Open-Chained Carbonates

In order to reduce CO2 accumulation in the atmosphere, chemical fixation methodologies were developed and proved to be promising. In general, CO2 was turned into cyclic carbonates by cycloaddition with epoxides. However, the cyclic carbonates need to be converted into open-chained carbonates by transesterification for industrial usage, which results in wasted energy and materials. Herein, we report a process catalyzed by tetramethylguanidine (TMG) to afford linear carbonates directly. This process is greener and shows potential for industrial applications.

Method for Preparing Aromatic Carbonate

A method for preparing an aromatic carbonate, of the present invention, comprises the steps of: (A) preparing a reaction mixture containing an aliphatic carbonate by reacting an organometallic compound and carbon dioxide; and (B) preparing an aromatic carbonate by reacting the reaction mixture and an aromatic alcohol. The method for preparing an aromatic carbonate allows an aromatic carbonate to be economically prepared in a high yield by using carbon dioxide as a carbonyl supply source.

Alkyl and aryl 4,5-dichloro-6-oxopyridazin-1(6 H)-carboxylates: A practical alternative to chloroformates for the synthesis of symmetric and asymmetric carbonates

Symmetric and asymmetric carbonates were synthesized by using alkyl or aryl 4,5-dichloro-6-oxopyridazin-1(6H)-carboxylates. Five aryl 4,5-dichloro-6-oxopyridazin-1(6H)-carboxylates were converted into the corresponding diaryl carbonates in good to excellent yields by treatment with potassium carbonate in refluxing THF. When the 4,5-dichloro-6-oxopyridazin-1(6H)-carboxylates were treated with aliphatic or aromatic alcohols in the presence of potassium tert-butoxide in toluene at room temperature, they gave the corresponding symmetric or asymmetric carbonates in moderate to excellent yields. Alkyl and aryl 4,5-dichloro-6-oxopyridazin-1(6H)-carboxylates are therefore efficient, stable, and ecofriendly alternatives to chloroformates.

Method for preparing aromatic carbonate

A method for preparing an aromatic carbonate, of the present invention, comprises the steps of: (A) preparing a reaction mixture containing an aliphatic carbonate by reacting an organometallic compound and carbon dioxide; and (B) preparing an aromatic carbonate by reacting the reaction mixture and an aromatic alcohol. The method for preparing an aromatic carbonate allows an aromatic carbonate to be economically prepared in a high yield by using carbon dioxide as a carbonyl supply source.

Efficient synthesis of diphenyl carbonate from dibutyl carbonate and phenol using square-shaped Zn-Ti-O nanoplates as solid acid catalysts

Square-shaped Zn/Ti oxides were prepared by a co-precipitation method and used for the synthesis of diphenyl carbonate (DPC) via transesterification of dibutyl carbonate (DBC) with phenol. The results showed that a 51% yield of butyl phenyl carbonate (BPC) and 13% yield of DPC could be achieved at 205 °C in the presence of 3ZnTi-400 (Zn : Ti molar ratio 3 : 1). Moreover, it is found that 3ZnTi-400 was also an active catalyst for the disproportionation of BPC to DPC, and 80% conversion of BPC was obtained at 190 °C. The prepared catalysts could be reused for three runs of the transesterification without noticeable deactivation. The catalysts were characterized by XRD, SEM, XPS, and TPD with the aim of establishing the relationship between catalytic performance and structure.

Synthesis of organic carbonates with alkyl/aryl 4,5-dichloro-6-oxopyridazine-1(6H)-carboxylates and ROH/AlCl3under ambient condition

We demonstrated the synthesis of organic carbonates using alkyl/aryl 4,5-dichloro-6-oxopyridazine-1(6H)-carboxylates and alcohol in the presence of aluminum chloride. Alkyl/aryl 4,5-dichloro-6-oxopyridazine-1(6H)-carboxylates were reacted with alcohol in the presence of AlCl3 in toluene at room temperature to afford the corresponding unsymmetric and symmetric organic carbonates in good to excellent yields. These are efficient and convenient processes. Alkyl/aryl 4,5-dichloro-6-oxopyridazine-1(6H)-carboxylates are solid, stable and non-toxic CO2/CO2R(Ar) source. It is noteworthy that the reaction is carry out under an ambient and acidic conditions, the easy-to prepare and readily available starting materials and the quantitative isolation of reusable 4,5-dichloropyridazin-3(2H)-one.

PROCESS FOR PRODUCING ISOCYANATE USING DIARYL CARBONATE

An object of the present invention is to provide a process that enables isocyanate to be produced stably over a long period of time and at high yield without encountering problems of the prior art during production of isocyanate without using phosgene. The present invention provides an isocyanate production process including the steps of: obtaining a reaction mixture containing an aryl carbamate having an aryl group originating in a diaryl carbonate, an aromatic hydroxy compound originating in a diaryl carbonate, and a diaryl carbonate, by reacting a diaryl carbonate and an amine compound in the presence of a reaction solvent in the form of an aromatic hydroxy compound; transferring the reaction mixture to a thermal decomposition reaction vessel; and obtaining isocyanate by applying the aryl carbamate to a thermal decomposition reaction, wherein the reaction vessel in which the reaction between the diaryl carbonate and the amine compound is carried out and the thermal decomposition reaction vessel for the aryl carbamate are different.

PROCESS FOR PRODUCING ISOCYANATE

An object of the present invention is to provide a process that enables isocyanate to be produced stably over a long period of time and at high yield without encountering problems of the prior art during production of isocyanate without using phosgene. The present invention discloses a process for producing an isocyanate by subjecting a carbamic acid ester to a thermal decomposition reaction, including the steps of: recovering a low boiling point component in a form of a gaseous phase component from a thermal decomposition reaction vessel in which the thermal decomposition reaction is carried out; recovering a liquid phase component containing a carbamic acid ester from a bottom of the thermal decomposition reaction vessel; and supplying all or a portion of the liquid phase component to an upper portion of the thermal decomposition reaction vessel.

PROCESS FOR PRODUCING ISOCYANATES USING DIARYL CARBONATE

An object of the present invention is to provide a process that enables isocyanate to be produced stably over a long period of time and at high yield without encountering problems of the prior art during production of isocyanate without using phosgene. The present invention provides an isocyanate production process including the steps of: obtaining a reaction mixture containing an aryl carbamate having an aryl group originating in a diaryl carbonate, an aromatic hydroxy compound originating in a diaryl carbonate, and a diaryl carbonate, by reacting a diaryl carbonate and an amine compound in the presence of a reaction solvent in the form of an aromatic hydroxy compound; transferring the reaction mixture to a thermal decomposition reaction vessel; and obtaining isocyanate by applying the aryl carbamate to a thermal decomposition reaction, wherein the reaction vessel in which the reaction between the diaryl carbonate and the amine compound is carried out and the thermal decomposition reaction vessel for the aryl carbamate are different.

ISOCYANATE PRODUCTION PROCESS

An object of the present invention is to provide a process that enables isocyanate to be produced stably over a long period of time and at high yield without encountering problems of the prior art during production of isocyanate without using phosgene. The present invention discloses a process for producing an isocyanate by subjecting a carbamic acid ester to a thermal decomposition reaction, including the steps of: recovering a low boiling point component in a form of a gaseous phase component from a thermal decomposition reaction vessel in which the thermal decomposition reaction is carried out; recovering a liquid phase component containing a carbamic acid ester from a bottom of the thermal decomposition reaction vessel; and supplying all or a portion of the liquid phase component to an upper portion of the thermal decomposition reaction vessel.