Catalysts function by providing an alternate reaction mechanism that has a lower activation energy than would be found in the absence of the catalyst. In some cases, the catalyzed mechanism may include additional steps. 10343-06-3, Name is 2,3,4,6-Tetra-o-acetyl-D-glucopyranose, molecular formula is C14H20O10. In a Article，once mentioned of 10343-06-3, name: 2,3,4,6-Tetra-o-acetyl-D-glucopyranose
The anomeric hydroxyl group of various pyranose hemiacetals can be esterified with inversion of configuration, conveniently, mildly and on large-scale using triphenylphosphine (TPP), with either diisopropylazodicarboxylate (DIAD) or diethylazodicarboxylate (DEAD) and a carboxylic acid in THF at either -50 deg C or at room temperature.
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Reference：
Tetrahydropyran – Wikipedia,
Tetrahydropyran – an overview | ScienceDirect Topics