- ENDO-METHYLENE HEXAHYDROPHTHALIC ANHYDRIDE AND PRODUCTION METHOD THEREOF
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The present invention belongs to the field of organic chemical synthesis, and discloses hexahydro-3,6-methanophthalic anhydride and a method of producing the same. The method uses maleic anhydride and mixed C5s as raw materials, generates Nadic anhydride by absorbing cyclopentadiene with maleic anhydride directly at a temperature of 0-5°C, and crystallizes to obtain a pure product; and a Cu-Ni/ZnO-ZrO2 or Co-Ni/ZnO-ZrO2 catalyst is added to the generated Nadic anhydride, carrying out a catalytic hydrogenation reaction in a high-pressure autoclave for 4-6 hours at a temperature of 100-140°C and under a hydrogen pressure of 1-4 MPa, the catalyst is filtered after cooling, and reduced pressure distilling to obtain the hexahydro-3,6-methanophthalic anhydride. Compared with the prior art, the present invention prepares the Nadic anhydride by using mixed C5s, an inexpensive by-product of ethylene, as a raw material, and further synthesizes hexahydro-3,6-methanophthalic anhydride while obtaining a chemical raw material de-cyclized C5s at the same time, enhances the in-depth processing of mixed C5s, and can be used widely in industrial production.
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Page/Page column 4-5
(2012/09/21)
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- METHOD OF SEPARATING STEREOISOMERS OF NORBORNENE, DICARBOXYLIC ACID HAVING NORBORNANE STRUCTURE, OR DERIVATIVE THEREOF
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A method of efficiently extracting a high-purity stereoisomer from a mixture comprising the endo isomer and the exo isomer of a dicarboxylic acid having a norbomene or norbomane structure, or a derivative thereof. The present invention relates to a method of separating the endo isomer and the exo isomer of a dicarboxylic acid represented by a general formula (1) or (2) or a derivative thereof, and includes the step of stirring and mixing a mixture comprising mainly the endo isomer of the dicarboxylic acid represented by the general formula (1) or (2) or a derivative thereof, and the exo isomer of the dicarboxylic acid represented by the general formula (1) or (2) or a derivative thereof, with a basic compound and a solvent. (wherein, R1 to R8 represent a hydrogen atom, methyl group, ethyl group, or butyl group), (wherein, R'1 to R'10 represent a hydrogen atom, methyl group, ethyl group, or butyl group)
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Page/Page column 19
(2008/06/13)
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