From Nonconjugated Diynes to Conjugated Polyenes:  Syntheses of Poly(1-phenyl-7-aryl-1,6-heptadiyne)s by Cyclopolymerizations of Asymmetrically α,ω-Disubstituted Alkadiynes

The synthesis of Poly(1-phenyl-7-aryl-1, 6-heptadiyne) by Cyclopolymerizations of asymmetrically α, ω distributed alkadiynes was discussed. The alkadiynes were prepared by a synthetic route involving consecutive palladium-catalyzed cross coupling reactions. Substitution of the olefinic hydrogen in cyclic polyene by an aromatic ring was used for the polymer stability. It was found that the polymer stability increases with a decrease in the number of the active hydrogen atoms.