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<p>carbenes are C-deprotonated imidazolium or dihydroimidazolium salts.  They often are deployed as <a href="page.php?w=Ligand">ancillary ligand</a>s in <a href="page.php?w=organometallic_chemistry">organometallic chemistry</a>.  Such carbenes are usually very strong ?-donor <a href="page.php?w=spectator_ligand">spectator ligand</a>s, similar to phosphines.  </p>

<p><big>Industrial applications</big></p>
<p>A large-scale application of carbenes is the industrial production of <a href="page.php?w=tetrafluoroethylene">tetrafluoroethylene</a>, the precursor</p><p>
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