4-Piperidone derivatives, their preparation and their use as sta

Details 4-Piperidone derivatives, their preparation and their use as sta 4-Piperidone derivatives, their preparation and their use as sta

1974-05-15

1976-01-20

Welsh, M. J.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

260 458SN, 260 458NZ, 26029389, C08K 500

Patent

active

039337359

ABSTRACT:
4-Piperidone derivatives having the formulae ##SPC1##
Wherein R represents a phenyl or naphthyl group which may be substituted with nitro, lower alkyl, halogen, hydroxyl, lower alkyl hydroxy, hydroxy lower alkyl or formyl or a 5- or 6-membered heterocyclic group having as a hetero atom at least one of oxygen atom, sulfur atom and nitrogen atom and R.sub.1 represents hydrogen atom or an alkyl group of 1 to 4 carbon atoms. They are useful as stabilizers for various synthetic polymers against their photo- and thermal-deteriorations and the 4-piperidone derivatives (II) are prepared from the corresponding 2,2,6,6-tetramethyl-4-oxopiperidine derivatives by reaction with an aldehyde and the 4-piperidone derivatives (I) are prepared from the 4-piperidone derivatives (II) through dehydration.

REFERENCES:
patent: 2739969 (1956-03-01), Sperber et al.
patent: 3513170 (1970-05-01), Murayama et al.
McElvain et al., JACS, Vol. 70, 1948, pp. 1820-1825.

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