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Synthesis of benzo[ghi]perylene via the cycloaddition of acetylene (in situ generated from nitroethene) [147,148]. Reagents and conditions: (a) 2-nitroethanol (acetylene source), phthalic anhydride, pressure vessel, 175 °C, o-Cl2C6H4, 4 d, Y = 58% [147] and (b) 2-nitroethanol (acetylene source), phthalic anhydride, 200 °C, MW, o-Cl2C6H4, 20 h, mixture of product and starting material was obtained (ratio 1.3:1, Y = 55%) [148].
