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. 2020 Nov 17;25(22):5373. doi: 10.3390/molecules25225373

Scheme 56.

Scheme 56

Mono- and double-cycloaddition of acetylene (nitroethene and vinyl sulfoxide as an acetylene source, “masked acetylene”) to the bisanthene bay region [147]. Reagents and conditions: (a) 2-nitroethanol (“masked” acetylene source), phthalic anhydride, pressure vessel, 135 °C, PhMe, 1 d, Y = 84%; (b) phenyl vinyl sulfoxide (“masked” acetylene source), 155 °C, no solvent, 1 d, Y = 16.5%