Accession Number : ADA198073


Title :   Controlled Ring-Opening Metathesis Polymerization by Molybdenum and Tungsten Alkylidene Complexes


Descriptive Note : Technical rept.


Corporate Author : MASSACHUSETTS INST OF TECH CAMBRIDGE DEPT OF CHEMISTRY


Personal Author(s) : Schrock, Richard S. ; Krouse, Steven A. ; Knoll, Konrad ; Feldman, Jerald ; Murdzek, John S. ; Yang, Dominic C.


Full Text : http://www.dtic.mil/get-tr-doc/pdf?AD=ADA198073


Report Date : 29 JUL 1988


Pagination or Media Count : 23


Abstract : A new, convenient preparation of tungsten (CHtBu)(NAr)Cl2(dme) (Ar = 2,6-diisopropylphenyl) involves treatment of W(NAr)(OtBu)2(CH2tBu)2 with PCl5 in dimethoxyethane as a final step. From it a variety of complexes of the type W(CHtBu)(NAr)(or)2 (R = alkyl or fluoroalkyl) can be prepared straightforwardly in high yield. Analogous complexes of the type Mo(CHtBu)(NAr)(OR)2 also have been prepared. Complexes in which OR =OtBu will not react with ordinary olefins, but will react with strained cyclic olefins such as norbornene and cyclopentene to give living polymers from which the organic polymer can be cleaved by treatment with aldehydes. Reprints.


Descriptors :   *TUNGSTEN , *MOLYBDENUM , *POLYMERIZATION , ALKYL RADICALS , RINGS


Subject Categories : POLYMER CHEMISTRY
      PROPERTIES OF METALS AND ALLOYS


Distribution Statement : APPROVED FOR PUBLIC RELEASE