melting point

Nonnatural amino acid 3-(4-thiazolyl)-D,L-alanine hydrochloride and its four intermediates were synthesized, their structures were detenmined by IR,NMR,elementary analysis and melting point.

合成了非天然氨基3-(4-基)-D，L-丙氨盐盐以及三个中间体，其结构分别通过红外光谱、核磁共振、元素分析、点等试手段得到确证。

The structure and working principle of the devices for melting point measurement by means of thin film comparative method of cryoscopy were introduced.

介绍凝固点下降薄层比较法点标准物质点的置的构成与工作原理。