Direct synthesis of soluble, end-functionalized polyenes and polyacetylene block copolymers.
The ring-opening metathesis polymerization (ROMP) of 1,3,5,7-cyclooctatetraene (COT) in the presence of a chain transfer agent (CTA) with a highly active ruthenium olefin metathesis catalyst resulted in the formation of soluble polyenes. Small molecule CTAs containing an internal olefin and a variety of functional groups resulted in soluble telechelic polyenes with up to 20 double bonds. Use of polymeric CTAs with an olefin terminus resulted in polyacetylene block copolymers. These materials were subjected to a variety of solution and solid phase characterization techniques including (1)H NMR, UV/vis, and FT-IR spectroscopies, as well as MALDI-TOF MS and AFM.
Scherman
Oren A
OA
Arnold and Mabel Beckman Laboratories for Chemical Synthesis, Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, California 91125, USA.
Rutenberg
Isaac M
IM
Grubbs
Robert H
RH