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. Author manuscript; available in PMC: 2022 Feb 24.
Published in final edited form as: Chem Rev. 2021 Jan 25;121(4):2413–2444. doi: 10.1021/acs.chemrev.0c00825

Figure 2.

Figure 2.

Earliest reports of cyclization of a triyne to a benzyne intermediate. (a)formattingasusedbyChemRev Ueda and coworkers (1997): trapping of the benzyne II with anthracene gives the triptycene 7. (b) Johnson and coworkers (1997): high temperature (short time) cycloisomerization of 8 to 10 via III and 9. (c) Sterenberg and Tsui (2009): intra-annular cyclization of dinuclear complex 11 in the presence of furan gives the adduct 12 via IV.