The Steric Effects of Alkyl Groups on the N–H Stretching Vibrations and the Rotational Isomerism of Alkylureas

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概要

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• The free N–H stretching vibrations of various trialkylureas, <I>R</I><SUB>2</SUB>U<I>R</I>′, in dilute solutions were studied in order to resolve our questions concerning the rotational isomerism of dialkylureas. In the infrared spectrum of <I>R</I><SUB>2</SUB>U<I>R</I>′, where <I>R</I> is isopropyl or cyclohexyl, an additional N–H band appears on the higher-frequency side of the <I>trans</I> N–H band. It was also observed that the larger the effective size of the <I>R</I>′ group on <I>R</I><SUB>2</SUB>U<I>R</I>′ is, the stronger the intensity of the additional band becomes. It was concluded, in connection with the rotational isomerism of dialkylureas, that the additional band arises from a form in which the N–H group is out of the skeletal plane.

• 公益社団法人 日本化学会の論文

著者

• Mido Yoshiyuki

  Department of Chemistry, Faculty of Science, Kobe University

• Gohda Tamotsu

  Department of Chemistry, Faculty of Science, Kobe University

関連論文

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• An Infrared Study of the Steric Effects of Alkyl Substituents on the N–H Stretching Absorptions of sym-Dialkylureas
• The Steric Effects of Alkyl Groups on the N–H Stretching Vibrations and the Rotational Isomerism of Alkylureas
• Studies of 8-Mercaptoquinoline as Chelate Agents. II. Infrared Absorption Spectra of its Divalent Metal Chelates

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