1·The amidocarbonylation reaction conditions were optimized and 66.4% isolated yield of racemic N-acetylleucine were obtained.
文中对酰胺羰基化反应条件进行了优化，分离得到消旋N-乙酰基亮氨酸产率为66.4%。
2·The invention discloses a method for preparing racemic selenium-methyl selenocysteine by using aldehyde catalysis.
本发明公开了一种利用醛催化制备消旋硒-甲基硒代半胱氨酸的方法。
3·The method has the advantages of convenient operation and low cost, and is suitable for the industrialized production of the racemic selenium-methyl selenocysteine.
该方法操作方便、成本较低、适合工业化生产消旋硒-甲基硒代半胱氨酸。
1·Use of stereoselective or stereospecific synthetic methods or separation of racemic mixtures can be used to obtain individual optical isomers.
可以使用立体选择或立体专一的合成方法，或者外消旋混合物的分离，来获得单独的光学异构体。
2·Glycidyl butyrate was synthesized from racemic epichlorohydrin and butyric acid by chemical means. The purity of the refined product was over 96% and the yield was about 47%.
利用化学方法，由外消旋环氧氯丙烷出发，合成丁酸环氧丙酯，精制后可获得纯度96%以上的丁酸环氧丙酯，收率为47%。