Process for preparing meta-substituted halophenols
AssigneeBayer Aktiengesellschaft
InventorsKarlfried Wedemeyer, Wolfgang Kiel, Werner Evertz
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AssigneeBayer Aktiengesellschaft
InventorsKarlfried Wedemeyer, Wolfgang Kiel, Werner Evertz
Estimating the term…
Phenols, meta-substituted by halogen are prepared by reacting halogenophenols of the formula ##STR1## wherein X.sup.1 and X.sup.2 are identical or different and represent halogen, hydrogen or optionally substituted aryl or aralkyl, with at least one of the radicals X.sup.1 or X.sup.2 representing halogen, and R.sup.1, r.sup.2 and R.sup.3 are identical or different and represent hydrogen or optionally monosubstituted or polysubstituted aryl or aralkyl or chlorine, bromine or iodine, with at least one of the radicals R.sup.1, R.sup.2 and R.sup.3 representing chlorine, bromine or iodine, With hydrogen under pressure at elevated temperature in the presence of elemental sulfur, or compounds thereof optionally in the presence of active charcoal and/or iron salts.
In a process for preparing a phenol which is meta-substituted by halogen by contacting a halogen phenol of the formula ##STR5## wherein X.sup.1 and X.sup.2 are identical or different and represent halogen, hydrogen, aryl selected from the group consisting of phenyl, naphthyl and aralkyl wherein the aralkyl group has 7 to 18 carbon atoms of which the alkyl portion has up to 6 carbon atoms, substituted aryl or substituted aralkyl wherein the substituent is selected from the group consisting of hydroxyl, halogen, alkyl having 1 to 6 carbon atoms, cycloalkyl having 5 to 6 carbon atoms, with at least one of the radicals X.sup.1 or X.sup.2 representing a halogen, and
Dependencies are inferred from the claim text.