Scheme 227. Synthesis of Doubly Fused Corannulene Tetrasulfone.
Reagents and conditions: (a)424 (1) benzene-1,2-dithiol, t-BuOK, DMF, rt, 1 h, (2) 60 °C, 21 h; (b) m-CPBA, DCM, rt, 48 h.
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