racemized
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The influences of the type and dosage of the aldehyde, organic acids, as well as the water content in the reaction system on the racemization were examined in detail, and L-Glu was racemized quickly in the presence of 0.2 molar ratio of L-Glu to salicylaldehyde in acetic acid containing 20% water.
详细考察了醛的种类及用量、羧酸溶剂的种类、反应体系的含水量对消旋化的影响,结果表明L-谷氨酸在含20%水的乙酸溶剂中,以水杨醛作为催化剂(水杨醛与L-谷氨酸的物质的量比为0.2)的优化条件下可以快速地被消旋化。
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The influences of the type and dosage of the aldehyde, organic acids, as well as the water content in the reaction system on the racemization were examined in detail, and L-Glu was racemized quickly in the presence of 0.2 molar ratio of L-Glu to salicylaldehyde in acetic acid containing 20% water.
详细考察了腔的种类及用量、羧酸溶剂的种类、反应体系的含水量对消旋化的影响,结果表明L谷氨酸在含20%水的乙酸溶剂中,以水杨醛作为催化剂(水杨醛与L-谷氨酸的物质的量比为0.2)的优化条件下可以快速地被消旋化。
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During the total preparation process, it was inevitable to conduct with the chiral center of prolinamide and the target product would became racemized or even could not be obtained at all.
由于在合成过程中,不可避免的触及不对称中心,发生消旋使产率下降甚至得不到产物,因此本文还研究了D-脯氨酰胺在不同温度、pH值、反应时间下对它的消旋的影响和脱羧机理,这对以后的工业化生产有着极其重要的意义。
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The experimental results show that in the presence of acetic anhydride, the L-tyrosine can be completely racemized and converted into DL-tyrosine both in NaOH aqueous solution and in acetic acid solvent, and moreover, in the presence of acetic anhydride
今讨论了在碱性水溶液中,L-酪氨酸、乙酸酐和NaOH三者摩尔比例对消旋过程的影响和在纯乙酸溶剂中,乙酸用量和L-酪氨酸与乙酸酐的摩尔比例与消旋温度对消旋过程的影响。结果表明在乙酸酐的作用下,L-酪氨酸在纯乙酸溶剂中的消旋具有消旋速度快,DL-酪氨酸收率高的优点。