What is the role of hexaphenylbenzene (HPB) in the synthesis of p-extended [12]cycloparaphenylene (CPP) derivatives?

Label:chem

Topic
The synthesis of p-extended CPPs involves using hexaphenylbenzene (HPB) as a building block to create macrocycles that can be converted into ultrashort carbon nanotubes (CNTs) through oxidative cyclodehydrogenation.
Answer
Hexaphenylbenzene (HPB) serves as a key building block in the synthesis of p-extended [12]cycloparaphenylene (CPP) derivatives. It is embedded into a macrocycle to form cyclic hexaphenylbenzene trimers and larger homologues, which are then used to create polyphenylene cylinders (PPCs) and ultimately p-extended CPPs. The congested HPB motif restricts the rotational freedom of the attached phenyl groups, favoring the desired cyclodehydrogenation for CNT formation.
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