Cycloparaphenylenes (CPPs) are the smallest building blocks of "armchair" carbon nanotubes and have attracted increasing attention due to their naturally curved nanohoop structure, which make them well suited as templates for host-guest chemistry and the bottom-up synthesis of carbon nanotubes. Moreover, their curved and radially oriented π-system has generated increasing interest from the organic semiconductor community. A CPP consists of a number of para-connected benzene rings to form a loop-like structure.