最近实验用到Dowex 50x8 (H + ) resin，找了很多家都没有卖的，看到群里有发帖的说用国产的代替，请问有使用过的吗？下面是准备要做的实验，感谢有经验的有过类似实验经历的同学指导一下，谢谢！This derivative was prepared by heating, under reflux for 30 minutes, sialic acid in dry methanol in the presence of a small quantity of Dowex 50 which had previously been twice refluxed with dry methanol for 1 hour. The filtrate from the resin then was passed through a column of Dowex I-formate in order to remove sialic acid that had not reacted. The solvent was removed, and the residue was dried over Pz05 in a vacuum. The ester, recrystallized twice from methanol-ether, melted with decomposition at 169-171” (uncorrected).
