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METHODS FOR PREPARING CYCLIC ESTERS FROM FIVE OR SIX CARBON SUGAR ALCOHOLS AND FIVE OR SIX CARBON COMPOUNDS
METHODS FOR PREPARING CYCLIC ESTERS FROM FIVE OR SIX CARBON SUGAR ALCOHOLS AND FIVE OR SIX CARBON COMPOUNDS
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机译：从五种或六种碳糖醇和五种或六种碳化合物制备环酯的方法
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摘要
Described herein are improved methods for the preparation of 5- and 6-membered cyclic mono and diesters of sugar alcohols and anhydrosugar alcohols by reaction with an organic acid RCOOH over a solid acidic substrate. The process is adaptable to a continuous process for simultaneously making and separating the cyclic esters from the sugar alcohols and anhydrosugar alcohols under mild conditions using the solid acid substrate as both the catalyst and a chromatographic bed for separation. The reactions are performed at mild temperatures of 70° C. to 100° C. and the formation of the cyclic esters is nearly quantitative. Also described is a method for making 5- and 6-membered cyclic mono and diesters of sugar alcohols and anhydrosugar alcohols using microwave irradiation in the presence of the organic acid.
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