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Isosorbide or 1,4:3,6 dianhydrosorbitol is a solid compound with melting point of 60-62 degree C derived from corn starch. Hydrolysis of corn starch results in D-glucose, hydrogenation of D-glucose gives D-sorbitol and double dehydration of sorbitol catalyzed by acids results in isosorbide. Isosorbide is a very interesting compound for polyurethane chemistry, since it has a rigid bicyclic...