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. Author manuscript; available in PMC: 2017 Jun 29.
Published in final edited form as: J Am Chem Soc. 2016 Jun 15;138(25):7832–7835. doi: 10.1021/jacs.6b03786

Figure 1.

Figure 1

a, The HDDA cascade: hexadehydro-Diels–Alder (HDDA) cyclization of triyne 1 to give benzyne intermediate 2, followed by rapid (intra- or intermolecular) trapping yielding 3. b, Concerted vs. stepwise cycloisomerization pathways.