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 ...
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...
He's becoming more and more obsessive about punctuality.他对守时要求越来越过分了。a stickler for punctuality非常注重守时的人He's been taken to task for his habitual lack of punctuality.他因为经常不准时而受到批评....
Wash that goo off your hands.将你手上粘的东西洗掉.Thank you very much . Goo - bye.多谢了, 再见.Do I look like I enjoy being covered in white goo?我看起来会享受全身都是白色粘性物 吗 ?...
她喜欢这里高高的天花板，它造型优美，还带有一圈漆成白色的飞檐。She loved the gracefully high ceiling, with its white-painted cornice.楼上的每个房间都有飞檐遮阴的阳台.Each upstairs room opened on a balcony shaded by an overhanging roof.青砖红瓦, 飞檐回廊, 雕栏缕砖,杨柳垂绦.Red brick, ...