Abstract 2,5-Anhydro- d -altritol ( 2a ) and the previously-unknown 2,5-anhydro- d -iditol ( 3a ) have been prepared from 2,5-anhydro- d -mannitol ( 1a ). The preparation of 3a from the intermediate epoxide 7b is particularly sensitive to pH, and a mechanism is proposed to explain this. Attention is drawn to the limitations of the trifluoroperacetic acid-disodium hydrogenphosphate procedure for the
摘要由
2,5-脱水-d-甘露糖醇(1a)制备了2,5-脱
水-d-
麦芽糖醇(2a)和先前未知的2,5-脱
水-d-
麦芽糖醇(3a)。由中间体
环氧化物7b制备3a对pH特别敏感,并提出了解释该pH的机理。请注意
三环过氧乙酸-
磷酸氢二
钠方法对反应性降低的烯烃进行环氧化的局限性。