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<p>In <a href="page.php?w=Alpha_elimination">? elimination</a>, two substituents eliminate from the same carbon atom.  ?-Elimination typically occurs when strong bases act on acidic protons with no good vicinal <a href="page.php?w=Leaving_group">leaving groups</a>.  For example, <a href="page.php?w=phenyllithium">phenyllithium</a> will abstract <a href="page.php?w=Hydrohalic_acid">HX</a> from a <a href="page.php?w=haloform">haloform</a> (CHX<sub>3</sub>).  Such reactions often require <a href="page.php?w=phase-transfer_catalyst">phase-transfer conditions</a>.</p><p>
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