排序方式: 共有2条查询结果,搜索用时 0 毫秒
1
1.
Hongqi Li Jueshu Fang Juan Li Yulong Wang Xiujuan Tian Yuanhui Xiang 《Research on Chemical Intermediates》2013,39(8):3887-3893
A series of new phenyl esters based on a 5,16-pregnadiene-20-one skeleton, namely 3β-benzoyloxy-5,16-pregnadiene-20-ones, which may be good inhibitors of 17α-hydroxylase and 5α-reductase enzyme or useful intermediates for producing steroidal drugs, were synthesized starting from diosgenin. The structures of the steroids were characterized by 1H nuclear magnetic resonance (NMR), 13C NMR, infrared (IR), and mass spectra. 相似文献
2.
随温度变化的"变色龙" 总被引:1,自引:0,他引:1
按组成和性质将示温涂料分为3类,让中学生了解示温涂料的用途,认识其核心物质-热致变色材料变色的原理。 相似文献
1