Scheme 20.

Synthesis of nonalternant nanographenes containing azulene units by alkyne‐based cyclization: a) compound 123, b) compounds 126 and 127, and c) compound 132. AgBF₄: silver tetrafluoroborates; PhCl: chlorobenzene; TEA: triethylamine.^{[ 101} , ¹⁰⁵ , ^{106 ]}