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Enforcing Z-selectivity in olefin metathesis through use of catalysts grafted on well-defined phenolic hybrid material

Paper ID Volume ID Publish Year Pages File Format Full-Text
54675 47020 2014 8 PDF Available
Title
Enforcing Z-selectivity in olefin metathesis through use of catalysts grafted on well-defined phenolic hybrid material
Abstract

•New olefin metathesis catalysts were prepared by replacing surface silanol by phenol.•SOMC of a W-perhydrocarbyl on supported phenol.•SOMC of Mo-bispyrrolide alkylidene complexes on supported phenol.•Improvement of the activity of the aryloxide supported Mo and W in propylene metathesis.•Introducing a phenolic spacer enhances the stereoselectivity towards the Z isomer.

We have developed a new hybrid material, featuring single-site phenolic functions on a silica surface. This new material was used for the grafting, by surface organometallic chemistry, of tungsten perhydrocarbyl and molybdenum bispyrrolide alkylidene complexes. Dramatic improvements in terms of activity and stability were observed in propylene metathesis, when compared to the silica counterpart. Introducing a phenolic spacer between the active molybdenum center and the surface enhances the stereoselectivity towards the Z isomer.

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Keywords
Tungsten; Molybdenum; Olefin metathesis; Z-selective; Hydroquinone; Silica; Aluminum
First Page Preview
Enforcing Z-selectivity in olefin metathesis through use of catalysts grafted on well-defined phenolic hybrid material
Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Today - Volume 235, 15 October 2014, Pages 41–48
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis