We wish to report the chemical synthesis of polya-(l-*6)-anhydro-D-glucopyranose by an essentially stereospecific method. Highly purified 1,6-anhydro-2,3,4-tri-0-benzyl-j3-D-g!ucopyranose1 was dissolved in methylene chloride and treated at -78°with phosphorus pentaftuoride freshly generated from an aryldiazonium hexafiuorophosphate. All final purifications, transfers, degassings, and the polymerization itself were carried out on the rack using standard highvacuum techniques. Ranges of 10-20 mole % catalyst to monomer and 20-30% concentrations of monomer resulted in the formation of polymer of number-average molecular weights from 42,000 to 76,600, with molecu-
SynopsisPoly-u-( 1 + 6)-anhydro-~-glucopyrariose has been synthesized by the phosphoriis pentaflnoride-catalyzed polymerization of 1,&-anhydro-2,3,4-tri-O-benzyI-~-~-gl~icopyranose and subsequent debenzylation. Physical characterization establishes its high polymeric character and stereoregdarity.
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