The first size-selective synthesis of – and cycloparaphenylenes (CPP) has been achieved by strategically utilizing cis-1,4-diphenylcyclohexane-1,4-diyl as the key terphenyl-convertible L-shaped unit. To access the designed triangular or rectangular macrocyclic precursors, we utilized palladium-catalysed C–B/C–Br cross-coupling (Suzuki–Miyaura coupling) and/or nickel-mediated C–Br/C–Br coupling. We also established step-economical routes to  and CPP using nickel-mediated C–Br/C–Br coupling. The final aromatization steps toward CPPs were accomplished with NaHSO4. Thus, combined with our previous size-selective synthesis of  and –CPP, we completed our size-selective synthesis of –CPP. The successful size-selective syntheses of [n]CPPs speak well for the flexibility and reliability of our strategy using a cyclohexane ring.
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