Terphenyl ring systems are composed of three phenyl rings attached by single carbon-carbon bonds (Fig. 8.5) [142-146]. The rings of the system are oriented to achieve the least strained staggered conformation, resulting in a ''turn'' of the structural axis (see Chapter 7). The twist and pitch between the units are uniform, so substitutions at the ortho positions of the rings capture nearly the same

R1 R2 R3

R1 R2 R3


Terephthalamide scaffold

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