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Synthesis of Cis,syndiotactic A-alt-B Copolymers from Two Enantiomerically Pure Trans-2,3-Disubstituted-5,6-Norbornenes
- Source :
- ACS Central Science, Vol 2, Iss 9, Pp 631-636 (2016), ACS central science, vol 2, iss 9
- Publication Year :
- 2016
- Publisher :
- American Chemical Society, 2016.
-
Abstract
- Cis,syndiotacticA-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.
- Subjects :
- 010405 organic chemistry
General Chemical Engineering
Diastereomer
Sequence (biology)
General Chemistry
010402 general chemistry
01 natural sciences
0104 chemical sciences
Catalysis
Metal
lcsh:Chemistry
chemistry.chemical_compound
Monomer
chemistry
lcsh:QD1-999
visual_art
Tacticity
Polymer chemistry
Chemical Sciences
visual_art.visual_art_medium
Copolymer
Chirality (chemistry)
Subjects
Details
- Language :
- English
- ISSN :
- 23747951 and 23747943
- Volume :
- 2
- Issue :
- 9
- Database :
- OpenAIRE
- Journal :
- ACS Central Science
- Accession number :
- edsair.doi.dedup.....8e6cb4fa916059ef32ebb824e5de731b