Synthesis of Cis,syndiotactic A-alt-B Copolymers from Two Enantiomerically Pure Trans-2,3-Disubstituted-5,6-Norbornenes
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acscentsci.6b00200.pdf
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Author(s)
Jang, Eun Sil
John, Jeremy M
Schrock, Richard Royce
Date Issued
September 2016
Journal
ACS Central Science
Publisher
American Chemical Society (ACS)
Citation
Jang, Eun Sil, Jeremy M. John, and Richard R. Schrock. “Synthesis of Cis,syndiotactic A-Alt-B Copolymers from Two Enantiomerically Pure Trans-2,3-Disubstituted-5,6-Norbornenes.” ACS Central Science 2, no. 9 (September 6, 2016): 631–636. © 2016 American Chemical Society
Version
Final published version
Abstract
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. This approach to formation of an alternating AB copolymer contrasts dramatically with the principle of forming AB copolymers from achiral monomers and catalysts.
MIT Department
Massachusetts Institute of Technology. Department of Chemistry
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DOI of Published Version
https://doi.org/10.1021/ACSCENTSCI.6B00200
