Preparation of phenylacetyldehydes

Details Preparation of phenylacetyldehydes Preparation of phenylacetyldehydes

C - Chemistry, Metallurgy

07

C

260/566.9

C07C 45/58 (2006.01) C07C 45/51 (2006.01) C07C 45/52 (2006.01) C07C 45/54 (2006.01) C07C 47/20 (2006.01) C07C 323/62 (2006.01)

Patent

CA 1312626

- 28 - O.Z. 0050/39603/40063 Abstract of the Disclosure: Phenylacetaldehydes of the general formula I Image (I) where R1 to R5 are each independently of the others hydrogen, halogen or unsubstitutad or halogen-substituted alkyl, alkenyl, alkoxy, alkylthio or cycloalkyl, are prepared by a) reacting an epoxy of the general formula II or a phenylglycol of the general formula III Image (II) or Image (III) where R1 to R5 are each as defined above and Y and Z can be identical to or different from each other and are each hydroxyl, alkoxy, aryloxy or acyloxy, in the gas phase over a borosilicate zeolite catalyst at from 70 to 200°C under reduced pressure, or b) reacting a glycidic ester of the general formula IV Image (IV) where R1 to R3 are each as defined above and R6 is tert- butyl or i-propyl, in the liquid or gas phase in the presence of a zeolite and/or phosphate and/or phosphoric or boric acid on a carrier material and/or an acidic metal oxide at from 50 to 500°C under a pressure of from 0.01 to 50 bar.

583933

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