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AssigneesCymetech, LLC, California Institute of Technology
InventorsAndrew Bell, Robert H. Grubbs, John P Morgan, Jason L. Moore
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The invention provides a method for converting a less active or slower to initiate system to a higher activity system so that at the end of a polymerization the most active species is present in the system. The invention generally relates to a process for converting a less active or slower to initiate catalyst system to a higher activity catalyst system wherein the process comprises contacting a protected N-heterocyclic carbene with a metathesis catalyst and an olefin in the presence of energy. One of the benefits of the invention is that the amount of catalyst required is less than or lowered in the presence of the protected N-heterocyclic carbene as compared to the amount of catalyst required in the absence of the protected N-heterocyclic carbene. The protected N-heterocyclic carbene can be unsaturated or saturated. In addition, the invention describes novel ruthenium initiators and methods of making the same.
A process for converting a less active or slower to initiate catalyst system to a higher activity catalyst system, the process comprising contacting a protected N-heterocyclic carbene with a metathesis initiator and an olefin in the presence of energy, wherein the protected N-heterocyclic carbene is of the formula NHC—X2—Y, NHC is any N-heterocyclic carbene ligand, and X2—Y is any moiety that is released in the presence of energy.
A process for converting a less active or slower to initiate catalyst system to a higher activity catalyst system, the process comprising contacting a protected N-heterocyclic carbene with a tetra-coordinated metathesis initiator and an olefin in the presence of energy, wherein the protected N-heterocyclic carbene is of the formula NHC—X2—Y, NHC is any N-heterocyclic carbene ligand, and X2—Y is any moiety that is released in the presence of energy.
A process for converting a less active or slower to initiate catalyst system to a higher activity catalyst system, the process comprising contacting a protected N-heterocyclic carbene with a metathesis initiator and an acyclic olefin in the presence of energy, wherein the protected N-heterocyclic carbene is of the formula NHC—X2—Y, NHC is any N-heterocyclic carbene ligand, and X2—Y is any moiety that is released in the presence of energy.
Dependencies are inferred from the claim text.