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. Author manuscript; available in PMC: 2015 Feb 1.
Published in final edited form as: Chem Sci. 2014 Feb;5(2):545–550. doi: 10.1039/C3SC53014K

Scheme 1.

Scheme 1

The hexadehydro-Diels–Alder (HDDA) cascade of triyne 1 gives the highly substituted benzenoid derivative 2 via silyl ether trapping of the HDDA-generated benzyne 3.