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US 6,686,507 B2Granted
Purification of 2-methoxy-5-trifluoromethoxybenzaldehyde
AssigneePfizer Inc.
InventorsTimothy J. N. Watson, Patrice Arpin, Michael G. Vetelino
Life of this patent
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Abstract
A process for the purification of 2-methoxy-5-trifluoro-methoxy benzaldehyde oil in which the oil is converted to amine by reaction of a nitroaniline with the oil; the imine is isolated as a solid; and the solid imine is converted back to the 2-methoxy-5-trifluoromethoxy benzaldehyde oil. The nitroaniline is selected from the group consisting of 3-nitroaniline, 3-methyl-2-nitroaniline, 4-methyl-2-nitroaniline, 2 methyl-3-nitroaniline and 4-methyl-3-nitroaniline.
Claims6
A process for the purification of 2-methoxy-5-trifluoro-methoxy benzaldehyde comprising
- (a) converting said oil to an imine by reaction of a nitroaniline with said oil,
- (b) isolating said imine as a solid and;
- (c) converting back said solid imine is to said 2-methoxy-5-trifluoro-methoxy benzaldehyde oil.
Dependencies are inferred from the claim text.