Synthesis of <i>Cis</i>,<i>syndiotactic</i> A<i>-alt</i>-B Copolymers from Two Enantiomerically Pure <i>Trans</i> -2,3-Disubstituted-5,6-Norbornenes [electronic resource]
Cis,syndiotactic A-alt-B copolymers, where A and B are two enantiomerically pure trans-2,3-disubstituted-5,6-norbornenes with “opposite” chiralities, can be prepared with stereogenic-at-metal initiators of the type M(NR)(CHR')(OR”)(pyrrolide). Formation of a high percentage of alternating AB co...
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Online Access (via OSTI) |
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| Corporate Author: | |
| Format: | Government Document Electronic eBook |
| Language: | English |
| Published: |
Washington, D.C. : Oak Ridge, Tenn. :
United States. Department of Energy. ; distributed by the Office of Scientific and Technical Information, U.S. Department of Energy,
2016.
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| Subjects: |
| Summary: | Cis,syndiotactic A-alt-B copolymers, where A and B are two enantiomerically pure trans-2,3-disubstituted-5,6-norbornenes with “opposite” chiralities, can be prepared with stereogenic-at-metal initiators of the type M(NR)(CHR')(OR”)(pyrrolide). Formation of a high percentage of alternating AB copolymer linkages relies on an inversion of chirality at the metal with each propagating step and a relatively fast formation of an AB sequence as a consequence of a preferred diastereomeric relationship between the chirality at the metal and the chirality of the monomer. Finally, this approach to formation of an alternating AB copolymer contrasts dramatically with the principle of forming AB copolymers from achiral monomers and catalysts. |
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| Item Description: | Published through SciTech Connect. 09/06/2016. ACS Central Science 2 9 ISSN 2374-7943 AM. Eun Sil Jang; Jeremy M. John; Richard R. Schrock. |
| Physical Description: | p. 631-636 : digital, PDF file. |