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andong668: 金币+10, 翻译EPI+1, ★有帮助 2013-09-18 10:08:54
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Under the existent of deuterium replaced water solvent and chlorine anions, the capacity of guanidine groups in the compound 3 to absorb electrons from methyl is more intensive than phthalimide groups in the compound 1, which facilitates the reduction of the density of electron clouds surrounding the piperazine, abating the shielding that results the movement of electron clouds to the low-field. The chemical shift of the hydrogen in the same sites is relatively large. |
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