January 13, 2021 Journal article Open Access

Yasir, Mohammad; Kilbinger, Andreas F.M.

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        <foaf:name>Yasir, Mohammad</foaf:name>
        <foaf:givenName>Mohammad</foaf:givenName>
        <foaf:familyName>Yasir</foaf:familyName>
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            <foaf:name>University of Fribourg</foaf:name>
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        <foaf:name>Kilbinger, Andreas F.M.</foaf:name>
        <foaf:givenName>Andreas F.M.</foaf:givenName>
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    <dct:title>Cascade Ring-Opening/Ring-Closing Metathesis Polymerization of a Monomer Containing a Norbornene and a Cyclohexene Ring</dct:title>
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    <dct:issued rdf:datatype="http://www.w3.org/2001/XMLSchema#gYear">2021</dct:issued>
    <dcat:keyword>polymerization</dcat:keyword>
    <dcat:keyword>ring-opening metathesis polymerization</dcat:keyword>
    <dcat:keyword>cascade polymerization</dcat:keyword>
    <dct:issued rdf:datatype="http://www.w3.org/2001/XMLSchema#date">2021-01-13</dct:issued>
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    <dct:description>&lt;p&gt;Norbornene is polymerized extremely fast when reacted with Grubbs&amp;rsquo; first (&lt;strong&gt;G1&lt;/strong&gt;) or third generation catalyst (&lt;strong&gt;G3&lt;/strong&gt;) because of its very high ring strain energy. Cyclohexene, on the other hand, cannot be polymerized using &lt;strong&gt;G1&lt;/strong&gt; or &lt;strong&gt;G3&lt;/strong&gt; due to its very low ring strain energy. Subsequently, the sequence-selective polymerization of these two monomers is extremely challenging. A sequence-selective cascade ring-opening/ring-closing metathesis polymerization of the monomer &lt;strong&gt;M&lt;/strong&gt; containing both the norbornene and the cyclohexene ring using &lt;strong&gt;G1&lt;/strong&gt; or &lt;strong&gt;G3&lt;/strong&gt; is reported. The polymer structure was analyzed by &lt;sup&gt;1&lt;/sup&gt;H NMR, &lt;sup&gt;1&lt;/sup&gt;H&amp;ndash;&lt;sup&gt;1&lt;/sup&gt;H COSY, and &lt;sup&gt;1&lt;/sup&gt;H&amp;ndash;&lt;sup&gt;1&lt;/sup&gt;H ROESY spectroscopy and MALDI-ToF mass spectrometry. Polymers with moderate molecular weight dispersities and good molecular weight control were achieved by varying the ratio between monomer &lt;strong&gt;M&lt;/strong&gt; and &lt;strong&gt;G1&lt;/strong&gt;.&lt;/p&gt;</dct:description>
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