Stereoelectronic effects in cyclic sulfoxides, sulfones, and sulfilimines: application of the Perlin effect to conformational analysis.

Stereoelectronic effects in cyclic sulfoxides, sulfones, and sulfilimines: application of the Perlin effect to conformational analysis.
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环状亚砜、砜和硫亚胺中的立体电子效应:柏林效应在构象分析中的应用

DOI:
10.1002/chem.200601468
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发表时间:
2007
期刊:
影响因子:
--
通讯作者:
Claus Feldmann
Claus Feldmann
中科院分区:
--
文献类型:
--
作者:
Tobias Wedel;Monika Müller;Joachim Podlech;Helmut Goesmann;Claus Feldmann

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通过HMQC和HSQC实验,测定了2-亚甲基-1,3-亚硫烷和2-(2,2-二甲基亚丙基)-1,3-二硫杂环戊烷在构象受限条件下的1JC Perlin H偶联常数,并计算了它们的Perlin效应。这些化合物中SX基团(X=O,NTOS)的类型和相对构型分别对轴向和赤道C--H键的耦合常数的大小有很大影响。轴向的SO键对反周面的轴向CH键产生立体电子效应。由此产生的各个CH键的减弱导致了比相应的赤道CH键更小的耦合常数。赤道SO基团对β-CH键的影响是通过同核异规效应实现的。在这里,轴向的CH键被削弱,测得一个较小的耦合常数。磺胺基组表现出与亚砜基组相似的作用。
The1JCHcoupling constants in conformationally constrained sulfoxides, bissulfoxides, sulfoxide‐sulfones, and sulfilimines derived from 2‐benzylidene‐1,3‐dithiane and 2‐(2,2‐dimethylpropylidene)‐1,3‐dithiolane were measured by means of HMQC and HSQC NMR experiments and the Perlin effects were calculated. The type and the relative configuration of SX groups (X= O, NTos) in these compounds have a strong influence on the magnitude of coupling constants for axial and equatorial CH bonds, respectively. Axial SO bonds give rise to a stereoelectronic effect on antiperiplanar axial CH bonds. The resultant weakening of the respective CH bonds leads to a smaller coupling constant than for a respective equatorial CH bond. Equatorial SO groups have an influence on β‐CH bonds through a homoanomeric effect. Here, the axial CH bond is weakened and a smaller coupling constant is measured. Sulfilimine groups show similar effects to sulfoxide groups.
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