title: The solvent-free thermal dehydration of hexitols on zeolites.
abstract: Dehydration of galactitol, D-glucitol and D-mannitol at high temperature in the presence of molecular sieves without solvent under an argon atmosphere is described. Cyclodehydration products with retention or inversion of the configuration at asymmetric carbon atoms, were observed. Reaction of galactitol yielded racemic 1,4-anhydrogalactitol in a first step and then racemic 1,4:3,6-dianhydroiditol. Complete analytical separations of exhaustively O-acetylated reaction products were achieved by GC and structures were assigned using co-injection with standards.
authors.affiliation: Department of Chemistry, University of Gdańsk, Sobieskiego 18, Gdańsk, Poland.
authors.forename: Maria
authors.initials: M
authors.lastname: Kurszewska
authors.forename: Eugenia
authors.initials: E
authors.lastname: Skorupowa
authors.forename: Janusz
authors.initials: J
authors.lastname: Madaj
authors.forename: Antoni
authors.initials: A
authors.lastname: Konitz
authors.forename: Wiesław
authors.initials: W
authors.lastname: Wojnowski
authors.forename: Andrzej
authors.initials: A
authors.lastname: Wiśniewski
mesh_terms: D002236:Carbohydrate Conformation; D018360:Crystallography, X-Ray; D003890:Desiccation; D004376:Galactitol / Q000737:chemistry; D008353:Mannitol / Q000737:chemistry; D008958:Models, Molecular; D012997:Solvents; D013012:Sorbitol / Q000737:chemistry; D013402:Sugar Alcohols / Q000737:chemistry*; D013816:Thermodynamics; D017641:Zeolites
chemical_list: D012997:Solvents; D013402:Sugar Alcohols; D004376:Galactitol; D017641:Zeolites; D008353:Mannitol; D013012:Sorbitol