Ring-Opening Polymerization of Strained Cyclotetrasilanes as a New Route Towards Well Defined Polysilylenes

Abstract

Ring-opening polymerization of cyclic silanes is described as a new synthetic route to well defined high molecular weight polysilylenes. Strained cyclotetra-silanes with phenyl and methyl substituents at each Si atom in the four-membered ring are prepared by partial dephenylation of octaphenylcyclotetrasilane with triflic acid and subsequent treatment with methylmagnesium bromide. Chemoselectivity, regioselectivity and stereoselectivity of monomer synthesis is discussed in detail. In addition to classic anionic initiators for the ring-opening process, new catalysts and initiators based on transition metals (Cu, Pd, Pt) are described. They provide much better control of the microstructure than systems with Li+ counterion.

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Document Details

Document Type
Technical Report
Publication Date
May 25, 1992
Accession Number
ADA251020

Entities

People

  • Eric Fossum
  • Jerezy Chrusciel
  • Krzysztof Matyjaszewski
  • Marek Cypryk

Organizations

  • Carnegie Mellon University

Tags

Communities of Interest

  • Advanced Electronics

DTIC Thesaurus Topics

  • Abstracts
  • Aromatic Compounds
  • Catalysts
  • Chemical Reactions
  • Chemical Synthesis
  • Chemistry
  • Explosives Initiators
  • Isomers
  • Low Temperature
  • Metals
  • Molecular Weight
  • Optical Materials
  • Polymerization
  • Polymers
  • Spectra
  • Transition Metals
  • Transitions

Fields of Study

  • Chemistry

Readers

  • Organic Chemistry
  • Polymer Science and Technology