Deacetylation of crystalline tri-O-trityl-penta-O-acetyl sucrose gave an amorphous tri-O-trityl sucrose derivative and methylation of this product followed by graded hydrolysis with acetic acid yielded a sirupy penta-O-methyl sucrose. Hydrolytic cleavage of the penta-O-methyl sucrose to nearly equal amounts of 2,3,4-tri-O-methyl-D-glucose and 3,4-di-O-methyl-D-fructose established the original positions of the O-trityl groups at the primary carbons in the sucrose molecule. It was therefore evident that acetyl migration from C4 to C6 in the glucose moiety had occurred during an earlier synthesis of 1′,4,6′-tri-O-methyl sucrose from the tri-O-trityl-penta-O-acetyl sucrose. The probable conformation of the transition state in the acyl migration is discussed.
结晶的三个O-三苄基五个O-乙酰基蔗糖的脱乙酰化产生了无定形的三个O-三苄基蔗糖衍生物,随后对该产物进行甲基化,并通过乙酸水解得到糖浆状的五个O-甲基蔗糖。将五个O-甲基蔗糖水解成近乎相等的2,3,4-三个O-甲基-D-葡萄糖和3,4-二个O-甲基-D-果糖,确定了蔗糖分子中原始的O-三苄基基团位于主要碳原子上。因此,可以推断在从三个O-三苄基五个O-乙酰基蔗糖合成1′,4,6′-三个O-甲基蔗糖的早期过程中,乙酰迁移从C4迁移到了葡萄糖基团的C6。文中还讨论了酰基迁移过程中的可能构象转变状态。