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The influence of perhydroazepine and piperidine as further ancillary ligands on Ru-PPh3-based catalysts for ROMP of norbornene and norbornadiene

Paper ID Volume ID Publish Year Pages File Format Full-Text
42153 45912 2010 7 PDF Available
Title
The influence of perhydroazepine and piperidine as further ancillary ligands on Ru-PPh3-based catalysts for ROMP of norbornene and norbornadiene
Abstract

Polynorbornadiene and polynorbornene were synthesized via ring opening metathesis polymerization (ROMP) with [RuCl2(PPh3)2(amine)] as catalyst precursors, amine = piperidine (1) or perhydroazepine (2) in the presence of 5 μL of ethyl diazoacetate (EDA) ([monomer]/[Ru] = 5000; 40 °C with 1; 25 °C with 2). The effects of the solvent volume (2–8 mL of CHCl3), reaction time (5–120 min) and atmosphere type (argon and air) on the yields were investigated to observe the behavior of the two different precursors. Quantitative yields were obtained for 60 or 120 min regardless of the starting volumes, either in argon or air, with both Ru species. However, low yields were obtained for short times (5–30 min) when the reactions are performed with large volumes (6–8 mL). In argon, the yields were larger with 2, associated to a faster propagation reaction controlled by the Ru active species. In air, the yields were larger with 1, associated to a higher resistance to O2 of the starting and propagating Ru species. The different activities between 1 and 2 are discussed considering the steric hindrance and electronic characteristics of the amines such as ancillary ligands and their arrangements with PPh3 and Cl− ions in the metal centers.

Graphical abstractComplexes of type [RuCl2(PPh3)2(amine)], amine = piperidine or perhydroazepine, are efficient catalyst precursors for ring opening metathesis polymerization (ROMP) of norbornadiene and norbornene. The effects of the solvent volume, reaction time and atmosphere (argon or air) on the polymer yields were investigated.Figure optionsDownload full-size imageDownload high-quality image (111 K)Download as PowerPoint slide

Keywords
ROMP; Ancillary ligand; Ruthenium; Piperidine; Perhydroazepine
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The influence of perhydroazepine and piperidine as further ancillary ligands on Ru-PPh3-based catalysts for ROMP of norbornene and norbornadiene
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 374, Issues 1–2, 1 February 2010, Pages 194–200
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us