超共轭与立体电子效应
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洪鹄,黄兆和,柴正祺,张沅珒
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Hyperconjugative and Stereoelectronic Effect
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Hu HONG,Zhao-He HUANG,Zheng-Qi CHAI,Yuan-Jin ZHANG
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| 表2 移除不同超共轭对碳碳键长的影响(nm)a |
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| Deleted σC-H/σC-H* interaction | Staggered C-C (equil.) | Eclipsed C-C (top) | ΔC-C (top-equil.) | 5 | | C1-H1/C2-H4* (anti/syn, 6pairs) | 0.16190 | 0.15785 | -0.00405 | 5 | | C1-H1/C2-H5* (gauche/gauche, 12pairs) | 0.15410 | 0.15866 | 0.00456 | 5 | | All 18 pairs | 0.16423 | 0.16295 | -0.00128 | 5 | | No deletion | 0.15240 | 0.15385 | 0.00145 | 5 |
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