<p>Benzyne Conversion:
</p><p>The use of a carbon-13 labled precursor was used to determine the mechanism of the proposed 1,2- to 1,3-didehydrobenzene conversion of the <a href="//commons.wikimedia.org/w/index.php?title=Phenyl&amp;action=edit&amp;redlink=1" class="new" title="Phenyl (page does not exist)">phenyl</a> substituted aryne precursor <b>1</b> to acenaphthylene. 
</p>
<ul><li>blue = unscrambled position</li>
<li>red = scrambled position</li>
<li>purple = considering both positions together/cross-over product.</li></ul><ul><li>Compound <b>A</b> represents the intermediate meta-benzyene which interconverts the two ortho-benzyenes (<b>2</b> and <b>2B</b>)</li></ul>
Original PNG by <a href="//commons.wikimedia.org/w/index.php?title=User:V8rik&amp;action=edit&amp;redlink=1" class="new" title="User:V8rik (page does not exist)">V8rik</a>, coloured adaptation by <a href="//commons.wikimedia.org/w/index.php?title=User:Quantockgoblin&amp;action=edit&amp;redlink=1" class="new" title="User:Quantockgoblin (page does not exist)">Quantockgoblin</a>
Reference: A m-Benzyne to o-Benzyne Conversion Through a 1,2-Shift of a Phenyl Group. Blake, M. E.; Bartlett, K. L.; Jones, M. Jr. J. Am. Chem. Soc. 2003, 125, 6485. doi:10.1021/ja0213672