Biomedical Engineering Reference
In-Depth Information
Scheme 24
Synthesis
of
hb
-PAs
by
(co)polycyclotrimerization
of aryldiynes
(with
monoynes)
Because of the lack of the back-biting capability of the rigid aromatic
diynes, their homopolycyclotrimerizations are not as easy to control as those
of their congeners of flexible aliphatic diynes. Nevertheless, high molecular
weight
hb
-PAs could be obtained in quantitative yields from the homopolycy-
clotrimerizations of nitrogen-containing aromatic diyne (
59
-
65
)catalyzedby
