Treatment of β-cellobiose with 2 molar equivalents of trityl chloride in pyridine at 100°C for 1 h afforded three unusual ditritylates (2, 4, and 5) as well as the 6, 6'-ditritylate (3) which was the expected product. The ratios of 2, 4, and 5 to 3 were approximately 2, 2, and 1 : 60, respectively. Each unusual ditritylate was isolated by column chromatography and was crystallized as needles. Their structures were established by the use of 1H nuclear magnetic resonance (NMR), 13C-NMR, optical activity measurements, etc. It was concluded that 2 is trityl 6'-O-trityl-β-cellobioside, 4 is 2, 6'-di-O-tritylcellobiose, and 5 is trityl 6-O-trityl-β-cellobioside.
使用2摩尔当量的三苯
氯甲烷(trityl chloride)在
吡啶中于100°C下处理β-
纤维二糖1小时,得到了三种不寻常的双三苯甲基化产物(2、4和5)以及预期的6,6'-双三苯甲基化产物(3)。2、4和5与3的比例分别约为2:2:1和60:60:1。每种不寻常的双三苯甲基化产物通过柱色谱分离,并以针状晶体形式结晶。它们的结构通过1H核磁共振(NMR)、13C-NMR、光学活性测量等手段确立。结论是,2是三苯甲基6'-O-三苯甲基-β-
纤维二糖苷,4是2, 6'-二-O-三苯甲基
纤维二糖,5是三苯甲基6-O-三苯甲基-β-
纤维二糖苷。