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Solid-state polycondensation of natural aldopentoses and 6-deoxyaldohexoses was found to take place in the presence of H 3 PO 4 (5mol%) at 100–110°C under a N 2 flow, giving highly branched polysaccharide (Conv. 47–81%, M w =2700–12 000, M n =1400–2900); the reaction mixtures were powdery throughout the polymerization. The product polysaccharide was per-O-methylated...
A convenient synthesis of regiocontrolled poly(2,6-dihydroxy-1,5-naphthylene) (PDHN) with high molecular weights by oxidative coupling polymerization of 2,6-dihydroxynaphthalene (2,6-DHN) has been developed. Polymerizations were conducted in 2-methoxyethanol in the presence of di-μ-hydroxo-bis[(N,N,N',N'-tetramethylethylenediamine)copper (II)] chloride (CuCl(OH)TMEDA) as the catalyst under air at...
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