Catalyst for Ring Expansion Metathesis Polymerization of Cyclic Monomers
First Claim
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1. A tetraanionic pincer ligand metal-oxo-alkylidene complex of the structure:
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Abstract
A tetraanionic OCO pincer ligand metal-oxo-alkylidene complex is prepared from a trianionic pincer ligand supported metal-alkylidyne. The metal can be tungsten or other group 5-7 transition metal. The tetraanionic pincer ligand metal-oxo-alkylidene complex, a trianionic OCO pincer ligand metal complex, or a trianionic ONO pincer ligand metal complex can be used to polymerize cycloalkenes. The poly(cycloalkene)s are predominantly cis-alkene macrocyclics.
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Citations
10 Claims
- 1. A tetraanionic pincer ligand metal-oxo-alkylidene complex of the structure:
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4. A method of polymerizing a cyclic alkene, comprising
providing a catalytic initiator selected from a tetraanionic OCO pincer ligand metal-oxo-alkylidene complex, a trianionic OCO pincer ligand metal complex, or a trianionic ONO pincer ligand metal complex; -
providing a plurality of cyclic alkene monomers; and combining the catalytic initiator with the cyclic alkene monomers, polymerizing the plurality of cyclic alkene monomers into a macrocyclic poly(alkene). - View Dependent Claims (5, 6, 7, 8)
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- 9. A stereoregular cyclic polynorbornene, consisting of repeating units having greater than 95% cis content and greater than 95 syndiotactic content.
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