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US 6,900,347 B2Granted
Impurity inhibition in olefin metathesis reactions
AssigneeTillieChem, Inc.
InventorsBasil P. Paulson, Richard L Pederson
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Abstract
Reaction mixtures and methods using catalysts and reaction conditions to produce significantly improved yields (and thereby higher purity) of olefin metathesis products, with greatly reduced amounts of impurities. These techniques include in one instance reduction in temperature of reaction, and in another, the use of chemical compounds that act as reaction inhibitors of unwanted reactions to minimize or prevent formation of unwanted impurities.
Claims48
An olefin metathesis reaction mixture comprising:
- reactants comprising an internal olefin;
- an olefin metathesis catalyst;
- and
- a metathesis reaction product of an olefin metathesis reaction between the reactants;
- wherein the reaction mixture is maintained at a temperature in the range from about −72° C. to about 14° C. when the olefin metathesis reaction producing the metathesis reaction product proceeds, and wherein rates of reactions other than the olefin metathesis reaction are reduced by temperature conditions to reduce impurity production.
2 more elements
A process for olefin metathesis comprising:
- selecting an internal olefin;
- selecting an olefin metathesis catalyst;
- reacting a reaction mixture comprising the internal olefin and the olefin metathesis catalyst, at a temperature in the range from about −72° C. to about 20° C. to produce a selected metathesis reaction product, the reaction mixture comprising an insignificant amount of impurities.
An olefin metathesis reaction mixture comprising:
- reactants comprising an olefin;
- an olefin metathesis catalyst;
- and
- an inhibitor of reactions other than an olefin metathesis reaction in the mixture;
- wherein the olefin metathesis reaction is carried out in solvent free environment and when terminated, the amount of impurities in the reaction product is insignificant.
2 more elements
Dependencies are inferred from the claim text.