Nocovalent interactions in metal complexes. 14 Proton NMR spectroscopic investigation on stereoselectivity in cobalt(III) complexes of various 3-substituted 1-phenyl-1,3-propanediones.
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概要
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1:3-Cobalt(III) complexes of 3-substituted 1-phenyl-1,3-propanediones (C<SUB>6</SUB>H<SUB>5</SUB>–CO–CH<SUB>2</SUB>–CO–R) have been synthesized, and their stereoselectivities were studied with 400 MHz proton NMR spectroscopy. When the substituent (R) was ethyl, propyl, isopropyl, butyl, or isobutyl, the complexes were obtained in a mixture of fac and mer isomers with the fac/mer ratio of 1/3, demonstrating statistical distribution. When the substituent was <I>t</I>-butoxymethyl or cyclohexyloxymethyl the fac isomer was predominantly formed. The stereoselectivity in the geometrical isomer formation of the complexes was ascribed to the interligand CH/π-interaction occuring between the R group and the phenyl ring. The stereoselectivities of the complexes [Co(<I>l</I>-moba-X)<SUB>3</SUB>] (<I>l</I>-moba-X<SUP>−</SUP>=4-(<I>l</I>-menthyloxy)-1-(<I>p</I>-X-phenyl)-1,3-butanedionate ion; X=H, Br, CH<SUB>3</SUB>) were also examined by means of <SUP>1</SUP>H NMR spectroscopy and compared with the CD spectral result previously reported.
- 公益社団法人 日本化学会の論文
著者
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Okawa Hisashi
Department Of Chemistry Faculty Of Science Kyushu University
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Nakamura Michio
Department Of Host-defense Biochemistry Institute Of Tropical Medicine Nagasaki University
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Kato Masako
Department Of Chemistry Faculty Of Science Nara Women's University
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Kida Sigeo
Department of Chemistry Wakayama University
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Ito Tasuku
Department of Applied Molecular Science, Institute for Molecular Science, Okazaki National Research Institute
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Ito Tasuku
Department of Applied Molecular Science, Institute for Molecular Science
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Kida Sigeo
Department of Chemistry, Faculty of Science, Kyushu University 33
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