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 ...
We like him for his honesty, his lack of pretension.我们喜欢他的诚实、不浮夸。Her eyes stared into his with an expression of absolute honesty.她凝视着他的眼睛，一脸诚恳。The secret of success is honesty and fair dealing.成功的秘诀在于诚实和公平交易。...
This will mean more remand prisoners being held in police cells.这将意味着更多候审犯人会被拘押在警局拘留室。Nerve cells have limited ability to regenerate if destroyed.如果受到损伤，神经细胞再造的能力有限。The prison's inmates are being kept in their cells...
有一本地人被指控为这起谋杀案的凶手。A local man was accused of the murder.这些本地人看不起外国人.The natives look down their noses at foreigners.你是本地人还是外来人?Are you a native, or just a visitor?...