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US 6,555,717 B2Granted
Catalytic dehydroxylation of diols and polyols
AssigneesE. I. Du Pont de Nemours and Company, Brookhaven Science Associates, LLC
InventorsR. Morris Bullock, Marcel Schlaf, Paul Joseph Fagan, Elisabeth M. Hauptman
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Abstract
Secondary alcohols, specifically diols and polyols, are dehydroxylated to the corresponding primary alcohols using a homogeneous organometallic ruthenium complex catalyst.
Claims11
A process for the selective dehydroxylation of a secondary alcohol, comprising the step of contacting a secondary alcohol with hydrogen in the presence of a catalytically effective amount of a catalyst precursor having the formula {[CpRu(CO)2]2(μ-H)}+Q− or {[CpRu(CO)(PR′3)]2(μ-H)}+Q− or {[ZRu(L)]2(μ-H)}+Q−, wherein
- Q− is a non-coordinating or weakly coordinating nonreactive anion;
- Cp is η5—C5R5 wherein R is selected from the group consisting of hydrogen and substituted and unsubstituted C1-C18 alkyl groups, where any two adjacent R groups can together form a ring;
- R′ is selected from the group consisting of hydrogen, alkyl, aryl, alkoxy and aryloxy;
- Z is hydridotris(3,5-dimethylpyrazolyl)borate or hydrocarbyl hydridotris(3,5-dimethylpyrazolyl)borate;
- and
- L is (CO)2 or 1,5-cyclooctadiene;
- and, wherein the secondary alcohol has a secondary alcohol functionality.
4 more elements
Dependencies are inferred from the claim text.