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. 2021 Dec 1;122(1):565–788. doi: 10.1021/acs.chemrev.1c00449

Scheme 250. Synthesis of Diazadithia- and Diazadiselena[8]circulenes under Mild Conditions.

Scheme 250

Reagents and conditions: (a)470 (1) n-BuLi, THF, −78 °C, (2) H2O, −78 °C, 1 h, then rt, 2 h; (b) (1) n-BuLi, THF, −78 °C, (2) TMSCl, −78 °C, 1 h, then rt, 2 h; (c) n-BuLi, THF, −78 °C, 3 h, (2) S powder or Se powder, −78 °C, 2 h, then rt, overnight; (d) Cu powder, 250 °C.