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Chemistry Level 2

What is the electrophile when RCl + AlCl 3 \text{RCl + AlCl}_3 are used in Friedel Craft reaction .

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None of these A l C l 2 + AlCl_2^+ R + R^+ A l C l 4 − AlCl_4^- C l + Cl^+

Akhil Bansal by Akhil Bansal , 22, India

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2 solutions

Chew-Seong Cheong
Feb 15, 2016

There are two types of Friedel-Craft reaction: alkylation and acylation. A summary of alkylation is as follows:

Alkylation -- substitutes an alkyl (e.g. methyl, ethyl) group

  • Reagents: A haloalkane ( R X \ce{RX} ) and anhydrous aluminium chloride A l C l X 3 \ce{AlCl3}
  • Conditions: Room temperature; dry inert solvent (ether)
  • Electrophile: A carbocation R X + \boxed{\ce{R+}} (e.g. C H X 3 X + \ce{CH3+} )
  • Equation: C X 6 H X 6 + C X 2 H X 5 C l → C X 6 H X 5 C X 2 H X 5 + H C l \ce{C6H6 + C2H5Cl -> C6H5C2H5 + HCl}

Extracts from Friedel-Craft Reactions -- An Overview

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Lu Chee Ket
Jan 31, 2016

http://www.chemguide.co.uk/mechanisms/elsub/fcacyl.html

The electrophile R + R^+ is C H 3 C O + . C H_3 C O^+.

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