The yields of other cyclic acetals were between 62.并在此条件下合成了多种环缩醛,收率62.Eight acetals ( Ketals ) were synthesized under the optimal conditions.在最佳条件下,合成了八个缩醛 ( 酮 ) 化合物.The hydroxyl groups can be changed into esters , ethe...
The hydroxyl groups can be changed into esters , ethers , acetals and ketals, etc.最常用的羟基保护基可归纳为三类:酯类 、 醚类和缩醛或缩酮类.Eight acetals ( Ketals ) were synthesized under the optimal conditions.在最佳条件下,合成了八个缩醛 ( 酮 ) 化合物.The yields ...
Evidences concerning their self - autonomy and self - assertiveness abound in the three plays.而三位男主人翁相比之下不断 自我 否定、 自我 消融.Objective : To provide evidences for the identification of Argyreia acuta Lour.目的: 为鉴别和开发一匹绸提供科学依据....
The major purpose of his trip was to break the ice, and his itinerary so far has been packed full.他此行的主要目的是打破僵局，目前的行程已经排满。All right, again and then again. Our to left continue rightwards own itinerary.好吧, 再见就再见. 我们的向左向右继...
新娘穿著一条浅灰色薄绸睡衣, 显得更加迷人.The bride, in a light gray chiffon gown, is more charming.她的连衫裙是用薄绸做成的.Her dress was of silk tissue.薄绸: 一种极薄的丝绸或人造丝织物.Chiffon: a fabric of sheer silk or rayon....