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Date: 14-11-2019
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Date: 20-10-2019
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Date: 20-10-2019
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The general mechanism is the key to understanding electrophilic aromatic substitution. You will see similar equations written for nitration, sulphonation, acylation, etc., but the general mechanism is always the same – the major difference being the identity of the electrophile in each case. All involve an electrophilic addition step which is quickly followed by an electrophile elimination step.
Halogenation is an example of electrophillic aromatic substitution. In electrophilic aromatic substitutions, a benzene is attacked by an electrophile which results in substition of hydrogens. However, halogens are not electrophillic enough to break the aromaticity of benzenes, which require a catalyst (such as FeCl3) to activate. See above for a detailed examination of the mechanism for bromination of benzene.
1. What reagents would you need to get the given product?
2. What product would result from the given reagents?
3. What is the major product given the reagents below?
4. Draw the formation of Cl+ from AlCl3 and Cl2
5. Draw the mechanism of the reaction between Cl+ and a benzene.
Show Answer
1. Cl2 and AlCl3 or Cl2 and FeCl3
2. No Reaction
3.
4.
5.
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دراسة يابانية لتقليل مخاطر أمراض المواليد منخفضي الوزن
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اكتشاف أكبر مرجان في العالم قبالة سواحل جزر سليمان
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اتحاد كليات الطب الملكية البريطانية يشيد بالمستوى العلمي لطلبة جامعة العميد وبيئتها التعليمية
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