Proton and carbon-13 NMR study of 1,1,4,4-tetraphenyl- and 1,4-diphenyl-1,3-butadiene dianions in solution. The charge distributions, structural features and rotational barriers of phenyl groups.
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概要
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The dicarbanions (<B>1</B> and <B>2</B>) produced from 1,1,4,4-tetraphenyl- and 1,4-diphenylbutadienes (<B>1a</B> and <B>2a</B>) were investigated by means of the <SUP>1</SUP>H and <SUP>13</SUP>C NMR techniques. Large upfield shifts of the proton and carbon signals caused by the conversion of the hydrocarbons into the dianions were observed. Such shifts were used for evaluating the excess charge distributions in the dianions. From the coupling constants obtained it is concluded that the configuration of the central bond of the anion is the trans one for <B>1</B> but the cis one for <B>2</B>. Thermodynamical parameters were obtained for the restricted rotation of the phenyl group of the lithium salt of <B>2</B>.
- 公益社団法人 日本化学会の論文
著者
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Takahashi Kensuke
Department Of Applied Chemistry Nagoya Institute Of Technology
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Yokoyama Yukihiro
Department of Applied Chemistry, Nagoya Institute of Technology
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Takakura Yutaka
Department of Applied Chemistry, Nagoya Institute of Technology
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Sawasaki Takeshi
Department of Applied Chemistry, Nagoya Institute of Technology
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