Chiral ketone 4 derived from D-(-)-fructose was obtained by four steps reaction including protection with acetone, oxidation, deprotection selectively and trifluroacetylation.
以D-（-）-果糖为手性源，经过丙酮保护、氧化、选择性脱保护、三氟酰化四步反应得到手性酮4。
Explain why an equimolar mixture of D-glucose and D-fructose formed by hydrolysis of sucrose is called invert sugar in the food industry.
解释为什么蔗糖水解产生的D -葡萄糖和D -果糖等摩尔的混合物在食品工业上称为转化糖？
On a molecular level, D-tagatose is structurally identical to D-fructose, except for an inversion of the hydroxyl and hydrogen groups at the fourth carbon atom.
塔格糖是果糖的“差向异构体”，在分子水平上，除了第四个碳原子上的羟基和氢基团倒置外，D -塔格糖与D -果糖的结构是一样的。
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