<sup>13</sup>C-NMR Spectra of 2, 4-Pentanedione and 1-(p-Substituted phenyl)1, 3-butanediones and Their Cobalt(111) Complexes

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  • 2,4-ペンタンジオンならびに1-(p-置換フェニル)-1,3-ブタンジオン類とそれらのコバルト(III)錯体の<sup>13</sup>C-NMRスペクトル
  • ２，４‐ペンタンジオンならびに１‐（ｐ‐置換フェニル）‐１，３‐ブタンジオン類とそれらのコバルト（ＩＩＩ）錯体の｀１３´Ｃ‐ＮＭＲスペクトル

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13C-NMR spectra of 2, 4-pentanedione [1] and 1-(p-substituted phenyl)-1, 3-butanediones [2]J and their cobalt(III) complexes [3], [4] were measured in benzene-d6 chloroform-d and DMSO-d6, solutions. The signals of [1] in these solvents were observed around 202, 58, 3Oppm for the Keto (K) form, and around 191, 100 and 25ppm for the enol (E) form. The signals of the K form disappeared, as the sample concentration is lowered. By cornplexation, the signals near 191 and 100 ppm for the E form shifted to the higher magnetic field side, while the signal near 25ppm, the lower magnetic field side. In chloroform-d, the signals due to the acetoacetyl group of [2] were observed around 193, 182, 96 and 25ppm for the E form. In DMSO-d6, however, the signals for the K form were also observed around 53 and 3Oppm in addition to the signals for the E form. The 13C chemical shift of the acetoacetyl group for fac and mer isomers of [2] approximated to those for the E form of [2]. Each 13C of this group for the mer isomer was separated to the three signals with the difference of ±0.2 ppm. Linear relationships were found to exist between the 13C chemical shift for the acetoacetyl group of [2], [4] and Hammett parameters (δpp), Δ(the difference of chemical shift between both carbonyl carbons) of [2] and pKd, and δof [4]and 10Dq.

Journal

  • NIPPON KAGAKU KAISHI

    NIPPON KAGAKU KAISHI 1983 (1), 59-64, 1983-01-10

    The Chemical Society of Japan

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