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关注:1
2013-05-23 12:21
求翻译:In spite of the structural similarity, the31P NMR signals of 1A–4A (52–55 ppm) shift to the lower field in comparison to that of RhI(acac)(CO)(PPh3) (48.6 ppm), further implying the intensive electron-withdrawing effect of the neighboured positive-charged imidazolium on the decrease of the electron density of P-atom.是什么意思?![]() ![]() In spite of the structural similarity, the31P NMR signals of 1A–4A (52–55 ppm) shift to the lower field in comparison to that of RhI(acac)(CO)(PPh3) (48.6 ppm), further implying the intensive electron-withdrawing effect of the neighboured positive-charged imidazolium on the decrease of the electron density of P-atom.
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2013-05-23 12:21:38
尽管结构相似性, 1A- 4A( 52-55 ppm的)换档到较低场相比,该RHI (乙酰丙酮)(CO) ( PPH 3 )( 48.6 ppm的) ,还意味着密集电子the31P核磁共振信号
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2013-05-23 12:23:18
尽管结构相似性,31P核磁共振信号的1A-4A(52-55ppm)转向较低的田间,通过调节RHI增加CBYP(阿拉伯民航理事会)(CO)(人次3)(48.6ppm),进一步暗示了密集型电子-撤消影响毗邻的积极的充满imidazolium减少电子密度的P-凌动。
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2013-05-23 12:24:58
竟管结构相似性, 1A-4A 52-55 ppm转移the31P (核磁共振的信号) 对更低的领域与那RhI( acac比较)(CO)( PPh3) (48.6 ppm),更加进一步暗示密集的电子撤出的作用的在电子密度的减退neighboured正面被充电的imidazolium P原子。
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2013-05-23 12:26:38
尽管结构的相似性,1A — — 4A (52 — 55 ppm) 转移到较低的领域相比,RhI(acac)(CO)(PPh3) (48.6 ppm),the31P 核磁共振信号进一步暗示密集的状况,他们邻里正电咪唑类吸电子效应对 P 原子的电子密度降低。
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2013-05-23 12:28:18
不顾结构的类似, the31P NMR 以 1A-4A 发信号 (52-55 ppm) 改变到与 RhI(acac) 比较起来的更低的领域 ( CO )( PPh3 )(48.6 ppm),进一步意味着 P 原子电子密度对减少为邻的肯定向收费的 imidazolium 的强烈收回电子的效果。
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