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Anomalous Proton NMR Deshielding in Anilinopyrazoles

 

作者: DavidM. Rackham,   SarahE. Morgan,   JibanK. Chabrabarti,   TerrenceM. Hotten,  

 

期刊: Spectroscopy Letters  （Taylor Available online 1980）
卷期: Volume 13, issue 2-3  

页码: 159-164

 

ISSN:0038-7010

 

年代: 1980

 

DOI:10.1080/00387018008065079

 

出版商: Taylor & Francis Group

 

关键词: Proton NMR;Through Space Deshielding;IR Spectra;UV Spectra

 

数据来源: Taylor

 

摘要:

In connection with the synthesis of thienobenzodiazepines and certain heterocyclic analogues1, a number of anilino heterocycle precursors were prepared. Their proton NMR spectra were generally unexceptional with the exclusion of one of the pyrazole isomers which showed a remarkable deshielding of one proton signal in the aniline ring. Further investigations have inferred that this low field shift can be attributed to through speace deshielding by a proximal pyrazole nitrogen lone pair.

 

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