| Synthesis and crossover reaction of TEMPO containing block copolymer via ROMP. | |
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MedLine Citation:
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PMID: 20625541 Owner: NLM Status: In-Data-Review |
Abstract/OtherAbstract:
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We report on the block copolymerization of two structurally different norbornene monomers (+/-)-endo,exo-bicyclo[2.2.1]-hept-5-ene-2,3-dicarboxylic acid dimethylester (7), and (+/-)-endo,exo-bicyclo[2.2.1]-hept-5-ene-2,3-dicarboxylic acid bis(1-oxyl-2,2,6,6-tetramethyl-piperidin-4-yl) ester (9) using ruthenium based Grubbs' type initiators [(PCy(3))(2)Cl(2)Ru(benzylidene)] G1 (PCy(3) = tricyclohexylphosphine), [(H(2)IMes)(PCy(3))Cl(2)Ru(benzylidene)] G2 (H(2)IMes = 1,3-bis(mesityl)-2-imidazolidinylidene), [(H(2)IMes)(py)(2)Cl(2)Ru(benzylidene)] G3 (py = pyridine or 3-bromopyridine) and Umicore type initiators [(PCy(3))(2)Cl(2)Ru(3-phenylinden-1-ylidene)] U1 (PCy(3 )= tricyclohexylphosphine), [(H(2)IMes)(PCy(3))Cl(2)Ru(3-phenylinden-1-ylidene)] U2 (H(2)IMes = 1,3-bis(mesityl)-2-imidazolidinylidene), [(H(2)IMes)(py)Cl(2)Ru(3-phenylinden-1-ylidene)] U3 (py = pyridine or 3-bromopyridine) via ring opening polymerization (ROMP). The crossover reaction and the polymerization kinetics were investigated using matrix assisted laser desorption ionization mass spectroscopy (MALDI-TOF) and nuclear magnetic resonance (NMR), respectively. MALDI showed that there was a complete crossover reaction after the addition of 25 equivalents of the second monomer. NMR investigation showed that U3 gave a faster rate of polymerization in comparison to U1. The synthesis of block copolymers with molecular weights up to M(n) = 31 000 g/mol with low polydispersities (M(w)/M(n) = 1.2) is reported. |
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Authors:
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Olubummo Adekunle; Susanne Tanner; Wolfgang H Binder |
Publication Detail:
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Type: Journal Article Date: 2010-06-01 |
Journal Detail:
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Title: Beilstein journal of organic chemistry Volume: 6 ISSN: 1860-5397 ISO Abbreviation: Beilstein J Org Chem Publication Date: 2010 |
Date Detail:
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Created Date: 2010-07-13 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 101250746 Medline TA: Beilstein J Org Chem Country: Germany |
Other Details:
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Languages: eng Pagination: 59 Citation Subset: - |
Affiliation:
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Institute of Chemistry, Faculty of Natural Sciences II (Chemistry and Physics), Martin-Luther University, Halle-Wittenberg, von Danckelmannplatz 4, D-06120 Halle, Germany. |
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