Process for the preparation of 3-phenoxy-benzaldehydes
AssigneeBayer Aktiengesellschaft
InventorsKarlfried Wedemeyer, Helmut Fiege
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Abstract
In a process for the preparation of 3-phenoxy-benzaldehyde by oxidation of 3-phenoxy-benzyl alcohol of the formula ##STR1## in which m represents a number from 1 to 4, n represents a number from 1 to 5 and R.sup.1 and R.sup.2 are identical or different and denote hydrogen, halogen, alkyl, cycloalkyl, aralkyl, alkoxy, cycloalkoxy, aryloxy or perfluoroalkyl, with an oxygen containing gas in aqueous alkali at a temperature from the solidification point to the boiling point of the reaction mixture in the presence of a platinum metal catalyst and in the presence of lead and/or bismuth and/or tellurium and/or a compound of said lead, bismuth or tellurium.
Claims11
A process for the preparation of 3-phenoxy-benzaldehyde which comprises contacting 3-phenoxy-benzyl alcohol of the formula ##STR5## in which m represents a number from 1 to 4
- n represents a number from 1 to 5 and
- R.sup.1 and R.sup.2 are identical or different and denote hydrogen, halogen, alkyl, cycloalkyl, aralkyl, alkoxy, cycloalkoxy, aryloxy or perfluoroalkyl
- with an oxygen containing gas in aqueous alkali at a temperature from 0.degree. to 110.degree. C. in the presence of a platinum metal catalyst and in the presence of lead and/or bismuth and/or tellurium and/or a compound of said lead, bismuth or tellurium, said lead and/or bismuth and/or tellurium and/or compound thereof being present in the reaction mixture in an amount of at least 5.times.10.sup.-6 mol per mol of 3-phenoxy-benzyl alcohol to be oxidized.
Dependencies are inferred from the claim text.