Method for the preparation of 2-hydroxyarylaldoximes
AssigneeZeneca Limited
InventorDaniel Levin
Life of this patent
Estimating the term…
Abstract
A method for the preparation of a 2-hydroxyarylaldoxime which comprises reacting hydroxylamine with a 2-hydroxyarylaldehyde, said reaction being performed in the presence of a compound of a metal of Group II, Group III, Group IVA or Group VIA of the Periodic Table and/or under such conditions that the 2-hydroxyarylaldehyde is at least partially in the form of a salt and/or complex of a metal of Group II, Group III, Group IVA or Group VIA of the Periodic Table.
Claims29
A method for the preparation of a 2-hydroxyarylaldoxime which comprises reacting hydroxylamine or a salt thereof with a 2-hydroxyarylaldehyde, said reaction being performed in the presence of a compound of magnesium, aluminum, titanium, zirconium or chromium and/or under such conditions that the 2-hydroxyarylaldehyde is at least partially in the form of a salt and/or complex of magnesium, aluminum, titanium, zirconium or chromium.
A method according to claim t0 wherein the magnesium bis-phenoxide is derived-from a phenol of the formula:
- ##STR12## wherein each of R.sup.1, R.sup.2, R.sup.3 and R.sup.4, independently, represents a hydrogen or halogen atom or an alkyl, cycloalkyl, aralkyl, aryl, alkaryl, alkoxy, aryloxy, acyl or hydroxy group.
Dependencies are inferred from the claim text.