| ALTERNATE PREDOMINANCE IN COMPETITION FOR CONJUGATION IN NITROGEN BRIDGE COMPOUND |
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| 作者姓名： | 蒋明谦 虞忠衡 戴萃辰 |
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| 作者单位： | Institute of Chemistry，Academia Sinica，Beijing 100021，PRC，Institute of Chemistry，Academia Sinica，Beijing 100021，PRC，Institute of Chemistry，Academia Sinica，Beijing 100021，PRC |
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| 基金项目： | Project supported by the National Natural Science Foundstion of China. |
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| 摘 要： | It is demonstrated quantitatively that the serial number N is not m + n + 4 in the nitrogen bridge conjugated system (Ⅸ), so the lone pair of electrons on the nitrogen cannot conjugate with acenyl branch and formyl polyenic branch simultaneously. The character of UV spectra and substituent equivalents (△Ns) show that acenyl branch competes for the lone pair of electrons with formyl polyenic branch. If the length m of acenyl branch is lengthened while n keeps constant, a point where the acenyl branch is predominant over formyl polyenic branch in competition, will eventually be reached. On the other hand, the effect of the latter will become greater than the former. The effect of the two branches predominates each other alternately with the alternate increase in m and n values.
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ALTERNATE PREDOMINANCE IN COMPETITION FOR CONJUGATION IN NITROGEN BRIDGE COMPOUND |
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| JIANG MING-QIAN YU ZHONG-HENG DAI CUI-CHEN.ALTERNATE PREDOMINANCE IN COMPETITION FOR CONJUGATION IN NITROGEN BRIDGE COMPOUND[J].Science in China(Chemistry),1990(4). |
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| Authors: | JIANG MING-QIAN YU ZHONG-HENG DAI CUI-CHEN |
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| Institution: | JIANG MING-QIAN YU ZHONG-HENG** DAI CUI-CHEN |
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| Abstract: | |
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| Keywords: | rolo of homologous linearity nitrogen bridge conjugated system alternative competition for conjugation conjugated stem conjugated polarization |
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