Selective oxidation of chrysanthemyl alcohol
AssigneeAir Products and Chemicals, Inc.
InventorAugustine I. Dalton, Jr.
Life of this patent
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Abstract
Chrysanthemyl alcohol is selectively oxidized to the corresponding aldehyde by contact with oxygen-containing gas in the presence of supported noble metal catalyst composed of platinum on carbon. The obtained aldehyde may be further converted to chrysanthemic acid by oxidation with a solid inorganic oxidizing agent such as silver oxide in excess of stoichiometric quantity, or by reaction with a catalytic amount of oxidation promoting catalyst such as silver oxide in the presence of cupric oxide and molecular oxygen.
Claims14
In a method of producing chrysanthemyl aldehyde comprising selectively converting chrysanthemyl alcohol to the corresponding aldehyde, the improvement which comprises contacting at a temperature in the range of 75.degree. to 150.degree. C. the reactant alcohol dissolved in organic solvent, said alcohol being present in a range of about 2 to about 5% by weight of said solvent, with oxygen-containing gas in the presence of an amount of noble metal catalyst comprising about 10% platinum on carbon to provide a platinum metal/alcohol weight ratio of about 15% to 30% and recovering high yields of chrysanthemyl aldehyde.
In a method of producing chrysanthemic acid which comprises selectively oxidizing chrysanthemyl alcohol to chrysanthemic acid, the improvement which comprises oxidizing at a temperature in the range of 75.degree. to 150.degree. C. chrysanthemyl alcohol dissolved in organic solvent, said alcohol being present in a range of about 2 to about 5% by weight of said solvent, with free oxygen in the presence of an amount of supported noble metal catalyst comprising about 10% platinum on carbon to provide a platinum metal/alcohol weight ratio of about 15% to 30% to obtain a reaction product predominating in chrysanthemyl aldehyde, separating the obtained aldehyde product from the noble metal catalyst, and subjecting the same to further oxidation selectively to form chrysanthemic acid.
Dependencies are inferred from the claim text.