Accession Number : ADA137089

Title :   The Mechanism of Ziegler-Natta Polymerization of Acetylene: A Nutation NMR Study.

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

Corporate Author : COLUMBIA UNIV NEW YORK DEPT OF CHEMISTRY

Personal Author(s) : Clarke,T C ; Yannoni,C S ; Katz,T J

PDF Url : ADA137089

Report Date : 09 Dec 1983

Pagination or Media Count : 14

Abstract : Using nutation NMR spectroscopy the distance between adjacent 13C labels was measured in samples of polyacetylene prepared by polymerizing a dilute solution of double 13C-labelled acetylene in 12C-acetylene using titanium tetra-n-butoxide plus triethylaluminum as a catalyst. The experiments accord with expectation if the polymerization proceeds by a four-center insertion mechanism rather than by a metallacycle mechanism involving metal-carbenes. (Author)

Descriptors :   *Polymerization, *Acetylene, *Nuclear magnetic resonance, *Spectroscopy, Polymers, Catalysis, Labeled substances, Radioactive isotopes, Carbon, Catalysts, Titanium, Butyl radicals, Oxides, Ethyl radicals, Aluminum, Metals, Carbenes, Monomers

Subject Categories : Polymer Chemistry
      Atomic and Molecular Physics and Spectroscopy

Distribution Statement : APPROVED FOR PUBLIC RELEASE