Multiple choice

A carbene is a divalent organic ligand coordinated to the metal center. A carbene which can be likened to ketones is

  1. Difluorocarbene

  2. Fischer carbenes

  3. Schrock carbenes

  4. N-heterocyclic carbenes
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Fischer carbenes can be likened to ketones, with the carbene carbon being electrophilic, much like the carbonyl carbon of a ketone. Like ketones, Fischer carbene species can undergo Aldol-like reactions. The hydrogen atoms attached to the carbon α to the carbene carbon are acidic, and can be deprotonated by a base such as n-butyllithium, to give a nucleophile which can undergo further reaction.

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