Exploring Factors that Determine Cis/Trans Structure and Tacticity in Polymers Prepared by Ring Opening Metathesis Polymerizations Involving Initiators of the Type Syn and Anti Mo(NAr)(CHCMe2Ph)(OR)2. Observation of a Temperature Dependent Cis/Trans Ratio

The factors that determine the structure (cis/trans and tacticity) of polymers prepared by ring opening metathesis polymerization (ROMP) Using well-defined initiators of the type Mo(NAryl)(CHCMe2Ph)(OR)2 (Aryl = a substituted aryl group and OR = a variety of alkoxides) have been explored. The main f...

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Bibliographic Details
Main Authors: Schrock, Richard R, Lee, Jin-Kyu, O'Dell, Richard, Oskam, John H
Format: Report
Language:English
Subjects:
ALCOHOLS
ALKALI METALS
ALKOXIDE
ALKOXY RADICALS
ALKYLIDENE ROTAMERS
ANTI
ARYL RADICALS
CHEMICAL REACTIONS
CIS/TRAN
HIGH TEMPERATURE
HYDROGEN
HYDROXYL RADICALS
Inorganic Chemistry
LOW TEMPERATURE
METHYL RADICALS
MOLECULAR STRUCTURE
MOLYBDENUM
OPENING(PROCESS)
Organic Chemistry
PHENYL RADICALS
Physical Chemistry
Polymer Chemistry
POLYMERIZATION
POLYMERS
RINGS
ROMP(RING OPENING METATHESIS POLYMERIZATION)
ROTAMERS
SUBSTITUTES
SYMMETRY
SYN/ANTI
TACTICITY
TRANS
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Summary:The factors that determine the structure (cis/trans and tacticity) of polymers prepared by ring opening metathesis polymerization (ROMP) Using well-defined initiators of the type Mo(NAryl)(CHCMe2Ph)(OR)2 (Aryl = a substituted aryl group and OR = a variety of alkoxides) have been explored. The main finding is a dependence of cis/trans structure on temperature; at low temperatures (-35 deg C) all cis polymer is formed and at high temperatures (65 deg C) up to 90% trans polymers are formed. These results are consistent with formation of cis polymer from syn alkylidene rotamers and trans polymer from anti alkylidene rotamers in circumstances where syn and anti rotamers can interconvert. jg