Synthesis and ring opening metathesis polymerization studies of bimetallic molybedum catalysts of the type [Mo(NAr)(OR)2(=CH-C5H4)]2Fe

INOR 199

Andrea J. Gabert, ajgabert@mit.edu, Richard R. Schrock, rrs@mit.edu, and Adam S. Hock, ahock@mit.edu. Department of Chemistry, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Building 6 Room 428, Cambridge, MA 02139
Two catalytic centers active for ROMP have been synthetically linked together to allow for the synthesis of completely symmetric triblock copolymers. Reaction of {Mo(NAr)(ORF6)2(CHCPhMe2)} (NAr = 2,6-iPr2C6H3, ORF6 = OCCH3(CF3)2) with half an equivalent of divinylferrocene yields {Mo(NAr)(ORF6)2(=CH-C5H4)}2Fe. Further reaction with two equivalents of sodium tert-butoxide yields the less reactive catalyst {Mo(NAr)(OR)2(=CH-C5H4)}2Fe (OR = OC(CH3)3). Various homo- and triblock copolymers have been synthesized using these catalysts, including polymerization of monomers containing liquid crystal mesogens. The presence of one ferrocene moiety in each polymer chain aids in the analysis of the polymers by MALDI-TOF mass spectrometry, including end-group analysis, polydispersity and exact molecular weight determination.
 

Organometallic General and Catalysis
7:00 PM-9:00 PM, Sunday, 13 March 2005 Convention Center -- Hall D, Poster

Division of Inorganic Chemistry

The 229th ACS National Meeting, in San Diego, CA, March 13-17, 2005