What is the role of FeCl3 in the oxidative cyclodehydrogenation of [6]CCHPB and its C2-symmetric congener?

Label:chem

Topic
Oxidative cyclodehydrogenation is a key step in converting macrocycles into ultrashort carbon nanotubes (CNTs). FeCl3 is used as a reagent to induce this transformation.
Answer
FeCl3 plays a crucial role in the oxidative cyclodehydrogenation of [6]CCHPB and its C2-symmetric congener. For [6]CCHPB, a loss of 20 hydrogen atoms was observed, while for the C2-symmetric congener, a loss of 60 hydrogen atoms was achieved. This indicates that FeCl3 effectively promotes the cyclodehydrogenation process, with the C2-symmetric congener undergoing a higher degree of dehydrogenation, suggesting it is a more favorable precursor for CNT synthesis.
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