Living Polymerization of Substituted Acetylenes by a Novel Binary Catalyst, MoOCl4−n-BuLi

A novel MoOCl4-based binary catalyst, MoOCl4−n-BuLi, induced the living polymerization of o-CF3-phenylacetylene. A catalyst composition of MoOCl4:n-BuLi = 1:1 and anisole as polymerization solvent were favorable. The polydispersity ratio of the polymer was as small as 1.02; the initiator efficiency...

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Bibliographic Details
Published in:Macromolecules 1998-05, Vol.31 (10), p.3170-3174
Main Authors: Hayano, Shigetaka, Masuda, Toshio
Format: Article
Language:English
Subjects:
Applied sciences
Exact sciences and technology
Organic polymers
Physicochemistry of polymers
Polymerization
Preparation, kinetics, thermodynamics, mechanism and catalysts
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Summary:A novel MoOCl4-based binary catalyst, MoOCl4−n-BuLi, induced the living polymerization of o-CF3-phenylacetylene. A catalyst composition of MoOCl4:n-BuLi = 1:1 and anisole as polymerization solvent were favorable. The polydispersity ratio of the polymer was as small as 1.02; the initiator efficiency was no more than 1.5−2.5%. The living nature was confirmed by both multistage polymerization and time dependence of the polymerization. Ethanol in catalytic amounts decelerated the polymerization but hardly affected its living nature. n-Alkyllithiums were generally useful as second catalyst components. The polymerization proceeded in a living manner in the temperature range 0−30 °C. o-Me3Si-phenylacetylene, o-i-Pr-phenylacetylene, and 1-chloro-1-octyne also polymerized in a living fashion; their polydispersity ratios were 1.03, 1.08, and 1.08, respectively.
ISSN:0024-9297
1520-5835
DOI:10.1021/ma971575s