Exploration of Cocatalyst Effects on a Bimetallic Cobalt Catalyst System: Enhanced Activity and Enantioselectivity in Epoxide Polymerization

Peter C. B. Widger; Syud M. Ahmed; Geoffrey W. Coates

doi:10.1021/ma201078m

Exploration of Cocatalyst Effects on a Bimetallic Cobalt Catalyst System: Enhanced Activity and Enantioselectivity in Epoxide Polymerization

Peter C. B. Widger, Syud M. Ahmed, Geoffrey W. Coates

Research output: Contribution to journal › Article › peer-review

37 Scopus citations

Abstract

Organic ionic compounds were synthesized and investigated as cocatalysts with a bimetallic cobalt complex for enantioselective epoxide polymerization. The identities of both the cation and the anion were systematically varied, and the subsequent reactivity was studied. The nature of the ionic cocatalyst dramatically impacted the rate and enantioselectivity of the catalyst system. The ionic cocatalyst [P(N=P(N(CH2)4)3) 4 +][tBuCO2 -] in combination with a bimetallic cobalt complex produced a catalyst system that exhibited the greatest activity and selectivity for a variety of monosubstituted epoxides. © 2011 American Chemical Society.

Original language	English (US)
Pages (from-to)	5666-5670
Number of pages	5
Journal	Macromolecules
Volume	44
Issue number	14
DOIs	https://doi.org/10.1021/ma201078m
State	Published - Jul 26 2011
Externally published	Yes

Bibliographical note

KAUST Repository Item: Exported on 2020-10-01
Acknowledged KAUST grant number(s): KUSC1-018-02
Acknowledgements: We thank the NSF (CHE-0809778) and the King Abdullah University of Science and Technology (KAUST; Award KUSC1-018-02) for support of this research. The authors are grateful to Dr. Kevin J. T. Noonan for helpful suggestions and Dr. Heloise Therien-Aubin for GPC analysis of isotactic poly(1,1,1-trifluoro-2,3-epoxypropane).
This publication acknowledges KAUST support, but has no KAUST affiliated authors.

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@article{8920d3fc1d2f4b4d8c9292d2991c80c3,

title = "Exploration of Cocatalyst Effects on a Bimetallic Cobalt Catalyst System: Enhanced Activity and Enantioselectivity in Epoxide Polymerization",

abstract = "Organic ionic compounds were synthesized and investigated as cocatalysts with a bimetallic cobalt complex for enantioselective epoxide polymerization. The identities of both the cation and the anion were systematically varied, and the subsequent reactivity was studied. The nature of the ionic cocatalyst dramatically impacted the rate and enantioselectivity of the catalyst system. The ionic cocatalyst [P(N=P(N(CH2)4)3) 4 +][tBuCO2 -] in combination with a bimetallic cobalt complex produced a catalyst system that exhibited the greatest activity and selectivity for a variety of monosubstituted epoxides. {\textcopyright} 2011 American Chemical Society.",

author = "Widger, {Peter C. B.} and Ahmed, {Syud M.} and Coates, {Geoffrey W.}",

note = "KAUST Repository Item: Exported on 2020-10-01 Acknowledged KAUST grant number(s): KUSC1-018-02 Acknowledgements: We thank the NSF (CHE-0809778) and the King Abdullah University of Science and Technology (KAUST; Award KUSC1-018-02) for support of this research. The authors are grateful to Dr. Kevin J. T. Noonan for helpful suggestions and Dr. Heloise Therien-Aubin for GPC analysis of isotactic poly(1,1,1-trifluoro-2,3-epoxypropane). This publication acknowledges KAUST support, but has no KAUST affiliated authors.",

year = "2011",

month = jul,

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doi = "10.1021/ma201078m",

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AU - Widger, Peter C. B.

AU - Ahmed, Syud M.

AU - Coates, Geoffrey W.

N1 - KAUST Repository Item: Exported on 2020-10-01 Acknowledged KAUST grant number(s): KUSC1-018-02 Acknowledgements: We thank the NSF (CHE-0809778) and the King Abdullah University of Science and Technology (KAUST; Award KUSC1-018-02) for support of this research. The authors are grateful to Dr. Kevin J. T. Noonan for helpful suggestions and Dr. Heloise Therien-Aubin for GPC analysis of isotactic poly(1,1,1-trifluoro-2,3-epoxypropane). This publication acknowledges KAUST support, but has no KAUST affiliated authors.

PY - 2011/7/26

Y1 - 2011/7/26

N2 - Organic ionic compounds were synthesized and investigated as cocatalysts with a bimetallic cobalt complex for enantioselective epoxide polymerization. The identities of both the cation and the anion were systematically varied, and the subsequent reactivity was studied. The nature of the ionic cocatalyst dramatically impacted the rate and enantioselectivity of the catalyst system. The ionic cocatalyst [P(N=P(N(CH2)4)3) 4 +][tBuCO2 -] in combination with a bimetallic cobalt complex produced a catalyst system that exhibited the greatest activity and selectivity for a variety of monosubstituted epoxides. © 2011 American Chemical Society.

AB - Organic ionic compounds were synthesized and investigated as cocatalysts with a bimetallic cobalt complex for enantioselective epoxide polymerization. The identities of both the cation and the anion were systematically varied, and the subsequent reactivity was studied. The nature of the ionic cocatalyst dramatically impacted the rate and enantioselectivity of the catalyst system. The ionic cocatalyst [P(N=P(N(CH2)4)3) 4 +][tBuCO2 -] in combination with a bimetallic cobalt complex produced a catalyst system that exhibited the greatest activity and selectivity for a variety of monosubstituted epoxides. © 2011 American Chemical Society.

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UR - https://pubs.acs.org/doi/10.1021/ma201078m

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SP - 5666

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JO - Macromolecules

JF - Macromolecules

IS - 14

ER -

Exploration of Cocatalyst Effects on a Bimetallic Cobalt Catalyst System: Enhanced Activity and Enantioselectivity in Epoxide Polymerization

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