天气预报15天查询> 其他> 顺反异构的条件

顺反异构的条件

更新时间: 2020-10-29 00:00:00     

1、分子不能自由旋转(否则将变成另外一种分子)

2、双键上同一碳上不能有相同的基团;注:同分异构是分子式相同,结构式不同,顺反异构是空间构象不同。但顺反异构属于同分异构。若双键上两个碳原子上连有四个完全不同的原子或基团,按“顺序规则”分别比较每个碳原子上连接的两个原子或基团,若两个较优基团在π键平面同侧者为Z型异构体,在异侧者为E型异构体。

关键词: 条件

如有意见、反馈、侵权或投诉等情况,请联系:

电话:
邮箱:

我们将会在48小时内给与处理!

版权所有 Copyright ? 2009-2020 tianqiyubao3.com

页面:/news/view-209553/ | 耗时:0.6840 s | 内存:1.89 MB | 查询:4 | 缓存读取:4 写入:0 | 加载文件:23
select * from tbl_Articles WHERE ArticleID=209553 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=209553 LIMIT 0,1
select * from tbl_Articles_sphinx where id=209553 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(1108141,1065713,1108401,1043057,1084909,1102470,1086902,1117652,1122422,1106116,1087439,1083208,1095792,1074870,1064977,1093693,1108051,1068262,1123263,1111870,1113383,1071821,1027251,1108171,1088906,1067331,1103971,1062488,1079431,1087911) ORDER BY field (ArticleID,1108141,1065713,1108401,1043057,1084909,1102470,1086902,1117652,1122422,1106116,1087439,1083208,1095792,1074870,1064977,1093693,1108051,1068262,1123263,1111870,1113383,1071821,1027251,1108171,1088906,1067331,1103971,1062488,1079431,1087911)