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  • electron donating

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    • 供电子
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    The energy gaps of the complexes were lessened in the presence electron - donating groups.

    供电基存在时复合物的能隙变小.

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    Electron - withdrawing 2 - substituents electron - donating 3 - substituents of the phenyl ring are favorable for increased herbicidal activity.

    苯环2位是拉 电子基,3位是给电子基有利于提高除草活性.

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