Process for the preparation of sterically hindered nitroxyl ethers
AssigneeBASF SE
InventorsKai-Uwe Schöning, Walter Fischer, Abdel-Ilah Basbas, Alexander Dichtl
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Abstract
The present invention relates to a novel process for the preparation of a sterically hindered nitroxyl ether from the corresponding sterically hindered nitroxyl radical by reacting it with a carbonyl compound and a hydroperoxide. The compounds prepared by this process are effective stabilizers for polymers against harmful effects of light, oxygen and/or heat, as flame-retardants for polymers and as polymerization regulators.
Claims17
A process for the preparation of a sterically hindered nitroxyl ether which comprises reacting a corresponding sterically hindered nitroxyl radical with an alkyl radical, which is formed in the reaction of a ketone, aldehyde, diketone or dialdehyde oligoketone or oligoaldehyde with a hydroperoxide in the presence of a metal catalyst,
- with the proviso that, if the sterically hindered nitroxyl radical is 2,2,6,6-tetramethylpiperidine-1-oxyl (TEMPO), the ketone is not acetone.
A compound which is
- 1-cyclohexenyloxy-2,2,6,6-tetramethyl-piperidin-4-ol,
- 1-cyclohexenyloxy-2,2,6,6-tetramethyl-piperidin-4-one,
- 1-heptyl-2-oxy-2,2,6,6-tetramethyl-piperidin-4-one or
- 1-pentyl-2-oxy-2,2,6,6-tetramethyl-piperidin-4-one.
Dependencies are inferred from the claim text.