Journal article Open Access

Cascade Ring-Opening/Ring-Closing Metathesis Polymerization of a Monomer Containing a Norbornene and a Cyclohexene Ring

Yasir, Mohammad; Kilbinger, Andreas F.M.

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    <subfield code="c">2021-01-13</subfield>
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    <subfield code="a">&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;</subfield>
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    <subfield code="a">Kilbinger, Andreas F.M.</subfield>
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    <subfield code="u">University of Fribourg</subfield>
    <subfield code="a">Yasir, Mohammad</subfield>
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    <subfield code="a">polymerization</subfield>
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    <subfield code="a">ring-opening metathesis polymerization</subfield>
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    <subfield code="a">10.1021/acsmacrolett.0c00882</subfield>
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    <subfield code="a">Cascade Ring-Opening/Ring-Closing Metathesis Polymerization of a Monomer Containing a Norbornene and a Cyclohexene Ring</subfield>
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