Process for the preparation of hydroxy benzene carboxaldehydes

Details Process for the preparation of hydroxy benzene carboxaldehydes Process for the preparation of hydroxy benzene carboxaldehydes

C - Chemistry, Metallurgy

07

C

260/621, 260/566

C07C 39/06 (2006.01) C07C 47/52 (2006.01)

Patent

CA 1211465

Abstract A process is provided for selectively decarbonylating hydroxybenzene carboxaldehydes having the formula: Image wherein: R is selected from the group consisting of alkyl, alkoxy, cycloalkyl, aryl, alkoxyalkyl, fluoroalkyl, and hydroxyalkyl oxyalkylene having from one to about twenty carbon atoms; hydroxyalkyl having at least two to about twenty carbon atoms; hydroxy; aldehyde CHO; and halogen; n1, n2 and n3 are zero or 1; and at least one of n1, n2 and n3 is 1; and x is zero, 1,2,3 or 4, to remove all or selected aldehyde groups in certain ring positions, either to yield more desirable aldehyde species or for recycling as starting material. The process comprises heating the aldehyde at a temperature within the range from about 75 to about 275°C in the presence of a palladium catalyst selected from the group consisting of metallic palladium and palladium hydroxide.

448684

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