Multiple choice

Pseudo-pericyclic reactions are reactions that appear at first glance to be pericyclic.Which of the following reaction is 'pseudo' pericyclic?

  1. Transmetalation

  2. Carbometalation

  3. Hydrometalation

  4. Alkyne trimerisation
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D Correct answer
Explanation

An alkyne trimerisation reaction is a 2+2+2 cyclisation reaction in which three alkyne molecules react to form an aromatic compound. The reaction is 'pseudo' pericyclic since it has not been observed to occur without the assistance of metal catalysis; and the metal catalyst assembles the ring stepwise via intermediates which are not directly in between (in a geometric sense) the starting material and products.

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