Accession Number : ADA137090

Title :   Polymerizations of Acetylenes and Cyclic Olefins Induced by Metal-Carbynes.

Descriptive Note : Technical rept. 22 Jun 82-9 Dec 83,


Personal Author(s) : Katz,T J ; Ho,T H ; Shih,N ; Ying,Y ; Stuart,V I W

PDF Url : ADA137090

Report Date : 09 Dec 1983

Pagination or Media Count : 51

Abstract : Trans-(bromotetracarbonyl(phenylmethylidyne)tungsten) and related metal-carbynes induce acetylenes and cycloalkenes to polymerize. The acetylenes include examples that are monosubstituted, disubstituted, and unsubstituted, as well as the first reported functionalized acetylenes in which the functional groups (the nitrile, ester, and halogen functions were studied) are not attached to the triple bond. The cycloalkenes yield polyalkenamers whose double bonds are largely cis. This last polymerization is speeded by the presence of oxygen. The stereochemistries of the polyacetylenes and the polynorborneamer produced when the initiator is the metal-carbyne are similar to those of the polymers produced when the initiator is pentacarbonyl(methoxyphenylmethylene) tungsten. A possible mechanism is presented to account for why the metal-carbynes behave as though they were sources of reactive metal-carbenes. (Author)

Descriptors :   *Polymerization, *Acetylenes, *Olefin polymers, *Cyclic compounds, Metals, Carbenes, Catalysis, Bromine, Carbonyl compounds, Phenyl radicals, Methyl radicals, Tungsten, Nitriles, Esters, Halogens, Alkenes, Alkynes, Stereochemistry, Methylenes

Subject Categories : Physical Chemistry
      Polymer Chemistry

Distribution Statement : APPROVED FOR PUBLIC RELEASE