In accordance with the conditions provided by literature, the yield of the experiment done by us was only 31-33%. It's probably because of the difficulty of cleavage of ether bond.
根据文献所提供的条件进行了实验，所得收率仅31-33％，分析原因为醚键断裂比较困难。
2
As an effective protection for hydroxy group in alcohols and phenols, the methods for the formation of tetrahydropyran ether and its cleavage employed in the last 15 years are reviewed.