Stoichiometric and Catalytic Ring Opening of Hexaalkylcyclodisilazanes by Organoalkali Reagents

Abstract

The action of organoalkali reagents (RLi, RLi/Me3CONa, RLi/Me3COK) on cyclo-(Me2SiNMe)2 and cyclo-(Me2SiNPri)2 results in ring opening to give alkali metal amides of the type RMe2SiNMeSiMe2NMeM (M= Li, Na, K) which react with chlorosilanes, R'Me2SiC1, to give the expected linear trisilazanes. Relatively unhindered lithium amides also open the cyclo-(Me2SiNMe)2 ring. The use of a catalytic amount of RLi or RLi/Me3CONa (but not of RLi/Me3COK) results in ring opening polymerization of cyclo-(Me2SiNMe)2 but not of the more hindered cyclo-(Me2SiNPr)2. Keywords: Preceramic polymers, Polysilazanes, Ceramic materials, Silanes, Polysilanes, Polymers.

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Document Details

Document Type
Technical Report
Publication Date
May 13, 1989
Accession Number
ADA208607

Entities

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  • Dietmar Seyferth
  • Joanne M. Schwark
  • Regina M. Stewart

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  • Massachusetts Institute of Technology

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  • Advanced Electronics
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  • Ceramic Materials
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  • Chemistry

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