Blake ME, Bartlett KL, Jones M. A m-benzyne to o-benzyne conversion through a 1,2-shift of a phenyl group.
J Am Chem Soc 2003;
125:6485-90. [PMID:
12785789 DOI:
10.1021/ja0213672]
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Abstract
Pyrolysis of two differently labeled versions of 3-phenylphthalic anhydride shows that a m-benzyne can form the related o-benzyne through shift of a phenyl group. The highest energy point in the process is the transition structure for a reverse carbon-hydrogen insertion in an intermediate benzopentalene. With the minor addition of an intermediate alkyne formed through a Roger Brown rearrangement, the original mechanism for formation of acenaphthalene accommodates the labeling results.
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