Benzynes parent structure

The structure of benzyne, the parent member of the aryne group of intermediates, has been the focus of many experimental and theoretical studies. For instance, its IR spectrum has been recorded by low temperature solid matrix photolysis of precursors like benzocyclobutanedione (4) and diazalactone (S).6-9 Force field calculations based on these observations indicate an extended triple bond in benzyne (6a).10 Semiempirical and ab initio calculations also predict the arynic bond to be longer than a normal triple... 

Arynes are formed when the loss of two mutually ortho substituents by an aromatic ring results in the formation of a triple bond [1-3]. Benzyne (1) is the parent member of a series that today comprises a huge number of substituted and unsubstituted monocyclic, polycyclic and heterocyclic compounds [2,3]. Figure 1 includes some illustrative examples of these structures 3-methoxy-... 

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