Metathesis Cyclopolymerization Research Articles

Ladder-like polyacetylene with excellent optoelectronic properties and regular architecture.

Novel double-stranded polyacetylene with a perylene bisimide bridge has been efficiently synthesized by metathesis cyclopolymerization of bis(1,6-heptadiyne) derivatives, and exhibited good solubility, highly thermal and oxidative stability, low LUMO energy levels, narrow bandgaps, and regular ladder-like architecture.

Catalytic cyclopolymerization and copolymerization of 1,6-heptadiynes by Mo(CO)6

The catalytic polymerization of a series of 1,6-heptadiynes (1–4) by Mo(CO)6 under simple thermal conditions produces corresponding poly(1,6-heptadiyne)s with highly conjugated polyenes. The number-average molecular weights of the polymers range from 2400 to 110,000. The structures of the polymers depend on the types of monomers employed. Namely, diethyl dipropargylmalonate (DEDPM) and 1 result in a polyene backbone consisting of only five-membered rings, whereas the remaining monomers (2–4) result in a mixture of both five-membered and six-membered ring structures. The copolymerization of DEDPM and phenylacetylene (PA) can also be effected by the same catalysis to yield a polyene backbone consisting of only five-membered rings as well as PA. The relative molar ratio of the two monomers determines the yields and molecular weights of the copolymers. Comparative studies show that Mo(CO)6 exhibits reactivity toward DEDPM alone, thus initially catalyzing metathesis cyclopolymerization of DEDPM followed by copolymerization with PA. © 2000 John Wiley & Sons, Inc. J Polym Sci A: Polym Chem 38: 2663–2670, 2000

Synthesis and Characterization of a Novel Electron-Acceptor Polymer Based on a Poly(1,6-heptadyine) Main Chain

The synthesis and charge transfert complex properties of a nover electron acceptor polymer (poly[2-([3,5-dinitrobenzoyl]oxy)ethyl dipropergyl acetate]), obtained by metathesis cyclopolymerization with various transition metal catalysts, are described

Synthesis and Properties of New Side-Chain Liquid Crystalline Polymers by Metathesis Cyclopolymerization

New thermotropic side-chain liquid crystalline polymers containing a poly(dipropargylamine) backbone were prepared by metathesis polymerization with transition metal catalysts. It was found that the MoCl 5 -EtAlCl 2 catalyst system was very effective for the cyclopolymerization of the presently investigated monomers. The resulting polymers exhibited good solubility in common organic solvents and could be cast on glass plates to give dark-brown films. Both monomers and polymers displayed enantiotropic liquid crystallinity. The room temperaure conductivities of the undoped and I 2 -doped polymers were found to be about 10 -11 and 10 -3 S/cm, respectively

Design and synthesis of a new side-chain liquid crystalline polymer by metathesis polymerization

A soluble liquid crystalline conducting polymer was obtained by metathesis cyclopolymerization of the compound (CH 2 C≡CH) 2 NCO(CH 2 ) 10 OPhPhCN

Synthesis and characterization of novel side-chain liquid crystalline polymers with a poly(1,6-heptadiyne) main chain

A new class of thermotropic side-chain liquid crystalline polymers was prepared by metathesis cyclopolymerization of monomers CH≡C-CH 2 C(R)(R')CH 2 C≡CH (R=R'= CO 2 (CH 2 ) 6 OPhPhOMe; R= H, R'= CO 2 (CH 2 ) 6 OPhPhCN) with MoCl 5 -based catalysts. Resulting polymers exhibited good solubility in common organic solvents and could be easily cast on glass plates to give black shiny thin films. The molecular weight M n of the polymers was in the range of 4.9x10 3 -1.1x10 5 . Both monomer and polymer displayed enantiotropic liquid crystallinity showing the reversible phase transitions. Room-temperature conductivities of the undoped and I 2 -doped polymers were found to be about 10 -11 and 10 -2 -10 -3 S/cm, respectively