Journal of the Korean Chemical Society (대한화학회지)

Korean Chemical Society (대한화학회)
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$^{13}C$nmr Studies on the Interaction of Lithium Salts to Formamide, Acetamide and Propionamide Systems

Formamide, Acetamide 및 Propionamide계에 대한 리튬염의 상호작용에 관한 $^{13}C$ nmr 연구

  • Dae-Ho Shin (Department of Chemistry, Korea University) ;
  • Jo W. Lee (Department of Chemistry, College of Natural Sciences, Seoul National University) ;
  • Young Sang Choi (Department of Chemistry, Korea University)
  • 신대호 (고려대학교 이과대학 화학과) ;
  • 이조웅 (서울대학교 자연과학대학 화학과) ;
  • 최영상 (고려대학교 이과대학 화학과)
  • Published : 1982.10.30
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Abstract

$^{13}C$resonances of carbonyl and various alkyl groups in amides are found to shift down-field on the interaction with lithium salts and it is shown that lithium ion binds directly to the carbonyl group in amides. The magnitudes of the $^{13}C$ chemical shifts of various amides depend not only on the size of alkyl groups in amides but also on the interaction with anion. The change of $^{13}C$chemical shift of amide in LiCl is smaller than that in$LiClO_4$ due to the difference of the charge density of the anion.

Li염이 아미드와 상호작용할 때 카르보닐기와 알킬기의 $^{13}C$chemical shift는 낮은 양쪽으로 이동하였으며, $Li^+$이온이 카르보닐기에 직접 결합함을 보였다. $^{13}C$ chemical shift의 크기는 아미드에 붙어있는 알킬기의 크기뿐만 아니라 음이온과의 상호작용에 의해서 지배됨을 알았다. 전하밀도가 큰 $Cl^-$이온이 $LiClO_4^-$이온보다 큰 음이온 효과를 나타냄을 보인다.

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