4,4-(O-phenylenedioxy)-2,2,6,6-tetramethyl piperidine
US3940401A · kind A · utility
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Key dates
| Filing date | Jul 24, 1974 |
| Grant date | Feb 24, 1976 |
| Priority date | — |
| Expiry date | Jul 24, 1994 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07D211/44
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
4-Piperidone ketal derivatives of the formulae ##SPC1## And ##SPC2## Wherein R.sub.1 represents an alkyl group of 1 to 8 carbon atoms and R.sub.2 represents an alkylene group of 2 or 3 carbon atoms or o-phenylene group and they are prepared by reacting triacetonamine with a monohydric alcohol of the formula EQU R.sub.1 --OH (III) wherein R.sub.1 is as defined above or a dihydric alcohol or phenol of the formula EQU R.sub.2 --(OH).sub.2 (IV) wherein R.sub.2 is as defined above in the presence of an acid catalyst. They are useful as statilizers against deterioration of synthetic polymers.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.