Nuclear magnetic resonance studies of copper(I) complexes of imidazoles. II Their reaction with ethylene, phosphite, and isocyanides.
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概要
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The reaction of binary copper(I) complexes of monodentate imidazole(im) with π acceptor ligands (ethylene, triethyl phosphite, <I>p</I>-tolyl isocyanide, and phenyl isocyanide) have been carried out in acetone. The resultant copper(I) complexes have been characterized by <SUP>1</SUP>H and <SUP>31</SUP>P NMR spectroscopy. Ethylene reacts with [Cu(im)<SUB>2</SUB>]<SUP>+</SUP> (<B>2</B>) to give [Cu(im)<SUB>2</SUB>(C<SUB>2</SUB>H<SUB>4</SUB>)]<SUP>+</SUP> (<B>2</B>-<B>b</B>), but does not react with [Cu(im)<SUB>3</SUB>]<SUP>+</SUP> (<B>3</B>). This shows a clear difference in reactivity between <B>2</B> and <B>3</B>. Phosphite and isocyanides give rise to a substitution reaction for im in <B>2</B> and <B>3</B>, accompanying with addition reaction. Among the copper(I) compounds prepared here, two- and fourcoordinate forms show sharp <SUP>1</SUP>H NMR signals of coordinated im, indicating that they are in the slowexchange regime. This proved that <SUP>1</SUP>H NMR spectroscopy is a useful tool to characterize diamagnetic copper(I)–imidazole complexes in solution.
- 公益社団法人 日本化学会の論文
著者
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Munakata Megumu
Department Of Chemistry Faculty Of Science And Technology Kinki University
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Kitagawa Susumu
Department Of Chemistry Faculty Of Science Tokyo Metropolitan University
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