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CAIE A-Level Chemistry 33.3.3 Addition–Elimination of Acyl Chlorides

Practise complete nucleophilic addition–elimination mechanisms with dipoles, lone pairs, charges and intermediates.

Syllabus
2028–2030
Course
Chemistry 9701
Level
A2

Exam points

  • draw the nucleophile lone pair attacking δ+ carbonyl carbon and move the C=O π pair onto oxygen
  • show the tetrahedral intermediate with correct bonds, lone pairs and formal charge on oxygen
  • re-form C=O from the oxygen lone pair while breaking C–Cl to release Cl−, then complete proton transfer

33.3.3—Mechanism: acyl chlorides in reactions question 1

[Maximum number: 2]

Benzophenone can also be synthesised in two steps from bromomethylbenzene.

Figure for Question 33.3.3—Mechanism: acyl chlorides in reactions question 1 — CAIE A-Level Chemistry A2

Name the mechanism of step 3 and suggest reagents and conditions for step 3 .
mechanism of step 3
reagents and conditions

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