N-メチルアセトアミド,アセトアニリド及びδ-ヴァレロラクタムの双極子能率について

概要

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Dipole moments of N-methylacetamide, acetanilide and δ-valerolactam were measured in various solutions. It was found that the molecular polarization of N-metylacetamide in the carbon tetrachloride solution becomes smaller as the concentration decreases. This can be explained by assuming that N-metylacetamide forms associated molecules with larger moments. The fact that the apparent dipole moment of this molecule decreases with rising temperature also supports this view. The same fact was observed on the acetanilide molecule in the benzene solution. On the other hand, the result of the measurement on δ-valerolactam in the carbon tetrachloride solution showed that the molecular polarization of this molecule increases rapidly with decreasing concentration. From this fact it may be concluded that δ-valerolactam, whose >C=O and >N-H groups are considered to be in the cis-position to each other, forms a ring dimer in the carbon tetrachloride solution. Furthermore, dipole moments of N-methylacetamide and acetanilide were measured in dioxane which tends to dissociate the associated solute molecules into single ones. A normal polarization-concentration relation was found here and the values of dipole moments were obtained as follows : N-methylacetamide, 4.12 D ; acetanilide, 4.02 D respectively. (Received March 12, 1951)
宇宙航空研究開発機構の論文
1951-08-20