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
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