Studies in stereochemistry I Steric strains as a factor in the relative stability of some coordination compounds of boron
Studies in stereochemistry I Steric strains as a factor in the relative stability of some coordination compounds of boron
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DOI：
10.1021/ja01254a031
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发表时间：
1942-01-01
影响因子：
15
通讯作者：
Cardon, SZ
中科院分区：
文献类型：
--
作者：
Brown, HC;Schlesinger, HI;Cardon, SZ
反应向右进行：R= CHS<（CHS）2CH<（CH3）3C。研究人员分离化合物，其异构现象是由限制旋转引起的。[2]近年来，自由旋转的原始概念需要作相当大的修改。不仅在二苯基3和苯4系列中发现了由受阻旋转引起的异构现象的实例，而且熵测量、偶极距和电子衍射研究也表明，乙烷及其简单衍生物中的旋转并不是完全“自由的”。简单脂肪族衍生物中“旋转异构体”的实际分离迄今为止可能不成功，这仅仅是因为异构体形式之间的低能垒。
Reaction proceeds to right: R= CHS<(CHS) 2CH<(CH3) 3C. investigators to isolate compounds, the isomerism of which is caused by restrictedrotation. 2 Within recent years, the original concept of free rotation has re-quired considerable modification. Not only have instances been dis-covered in the diphenyl3 and ben-zene4 series of isomerism caused by hindered rotation, but also entropy measurements, 5 dipole-moment6 and electron-diffraction7 studies have indicated that rotation in ethane and its simple derivatives is not entirely “free.” The actual isolation of “rotation isomers” in the simple aliphatic derivatives has probably been unsuccessful hitherto only because of the low energy barrier between the iso-meric forms.