【摘要】 考察了55、65和75℃、反应时间0～2h条件下葡萄糖在甲酸体系中的降解情况,在甲酸中仅少量降解,在盐酸、甲酸溶液中降解较为剧烈。通过GC-MS分析75℃、反应时间4h,葡萄糖在含不同盐酸质量分数的甲酸体系中的降解产物,结果表明,在88%甲酸溶液中的主要降解产物是1,3-二羟基-2-丙酮和羟基乙醛,其降解途径是C-4位上的羟基质子化形成碳正离子的重排反应。在4%、8%盐酸、甲酸溶液中的主要降解产物是5-羟甲基糠醛,其降解途径是C-2位上的羟基质子化形成碳正离子的重排反应。更多还原

【Abstract】 The degradation of β-D-glucose in formic acid solution has been studied.The effects of temperature(55-75 ℃)and retention time(0-2 h)have been investigated.It has been revealed that β-D-glucose is only marginally degraded in formic acid,but severely degraded in formic acid with hydrochloric acid.The degradation products of β-D-glucose at 75 ℃ for 4 h have been analyzed by GC-MS.The main degradation products are 1,3-dihydroxyl-2-acetone and hydroxyl acetaldehyde in 88 % formic acid,however 5-methoxyl furfural in formic acid with hydrochloric acid.The route of degradation is the protonation and cleavage of the hydroxyl group on the C-4 in formic acid,while on the C-2 in formic acid with hydrochloric acid,where the protonation of hydroxyl group results in the rearrangement of carbon cation before completing the dehydration reaction.Experimental observations supported these two degradation pathways.更多还原