Polymerization of acetylene and its monosubstitutes in the presence of halides and oxohalides of molybdenum and tungsten

Abstract

MoCl5, WCl6, and OMoCl4 were found to be effective initiators for the polymerization of acetylene and its monosubstituted derivatives RCCH. The polymerization proceeded in homogeneous and heterogeneous media and was carried out in nonpolar (chloroalkanes, aromatic hydrocarbons) and polar (THF, acetone, dioxane, carboxylic acids) solvents to give a high yield of polymers.

Synthesis and characterization of a novel polyimide-based second-order nonlinear optical material

“…[7][8][9] It is known that the interesting features of silicon containing polymers are high thermal stability, gas permeabilities, weather resistance, insulating properties, and so on. 10,11 Recently, many studies have been reported that polymers containing trimethylsilyl derivatives has excellent gas permeability. [12][13][14][15][16][17] Soluble polyimides containing bulky and flexible trimethylsilyl offer particular promise in gas separation membrane application due to their superior mechanical property, high permeability and permselectivity.…”

Precursor route to ethenyl-substituted polyacetylenes: synthesis of homopolymers of o-trimethylsilyl-ethers of 1-alkyl and 1-aryl substituted but-3-yn-1-ols. Desilylation, dehydration and pyrolysis to conducting films

“…Sharp ~3C signals at 34.2 and 129.9 ppm were assigned to small amounts of trimer. The broad signal of the vinylic region clearly indicates atactic microstructures for all polymers [17,18]. Fr-IR spectroscopy (KBr pellets) proved the absence of carbonylic impurities (1705 cm -1) [17].…”

“…The broad signal of the vinylic region clearly indicates atactic microstructures for all polymers [17,18]. Fr-IR spectroscopy (KBr pellets) proved the absence of carbonylic impurities (1705 cm -1) [17]. The highest yieldwas realized in the case of the unsubstituted o-silylated but-3-yn-l-ol, la.…”

Polymerization of hydroxyacetylenes by ruthenium alkylidene complexes

“…The substituted poly(acetylene)s are practically more useful because of their higher stability towards air and their solubility in organic solvents compared to non-substituted poly(acetylene) [9][10][11][12]. The polymerization of substituted alkynes has been carried out with a number ill-defined Mo-, W-, Ru-, Rh-etc.…”