Synthesis of Liquid Crystal Cyclic Oligomer and More Complex Cyclic
Architectures
Two decades ago, Percec and coworkers [57–61] synthesized a range of cyclic
oligomers with liquid crystal properties. Under dilute conditions and using base
catalysis, cyclic oligomers with different units of liquid crystal groups and different
length of spacers were obtained through etherification between phenol and bromide
(Scheme 10). They further introduced an acrylate to those cyclic oligomers to make
cyclic oligomonomers, and then polymerized them to produce grafted polymers
with cyclic pendants (Scheme 11). Alternatively, two phenol groups were
introduced to the cyclic oligomers, followed by further etherification to produce
cyclic spiro-polymer structures (Scheme 12).
Scheme 10 Synthesis of cyclic oligomer by etherification between bromide and phenol groups
n
n
n
or
or
Scheme 11 Synthesis of grafted polymers with cyclic oligomer pendants showing liquid crystalline property
308
Z. Jia and M.J. Monteiro
Architectures
Two decades ago, Percec and coworkers [57–61] synthesized a range of cyclic
oligomers with liquid crystal properties. Under dilute conditions and using base
catalysis, cyclic oligomers with different units of liquid crystal groups and different
length of spacers were obtained through etherification between phenol and bromide
(Scheme 10). They further introduced an acrylate to those cyclic oligomers to make
cyclic oligomonomers, and then polymerized them to produce grafted polymers
with cyclic pendants (Scheme 11). Alternatively, two phenol groups were
introduced to the cyclic oligomers, followed by further etherification to produce
cyclic spiro-polymer structures (Scheme 12).
Scheme 10 Synthesis of cyclic oligomer by etherification between bromide and phenol groups
n
n
n
or
or
Scheme 11 Synthesis of grafted polymers with cyclic oligomer pendants showing liquid crystalline property
308
Z. Jia and M.J. Monteiro