Derivatives of 4-oxopiperidines and their use as polymer stabili

Details Derivatives of 4-oxopiperidines and their use as polymer stabili Derivatives of 4-oxopiperidines and their use as polymer stabili

1976-05-19

1978-08-08

Czaja, Donald E.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

260 457PH, 260 4585B, 26029358, 26029366, 526 6, C08K 534, C08K 535, C07D49110

Patent

active

041056264

ABSTRACT:
Cyclic ketals of sterically hindered 4-oxopiperidines are effective light-stabilizers for organic polymers. These compounds have at least five alkyl groups in ring positions 2,3,5 and 6 and four alkyl groups in ring positions 2 and 6, preferably methyl and ethyl groups. The ring nitrogen may be unsubstituted or substituted with a monvalent substitutent. The new compounds can be synthesized by ketalization of the corresponding 4-oxopiperidines with diols, triols or tetrols. Using triols the obtained ketals possess hydroxyl groups which may be esterified or etherified in a subsequent reaction step. Ketalization with tetrols yields cyclic bis-ketals.

REFERENCES:
patent: 3790525 (1974-02-01), Murayama et al.
patent: 3839273 (1974-10-01), Murayama et al.
patent: 3859293 (1975-01-01), Murayama et al.
patent: 3899464 (1975-08-01), Murayama et al.
patent: 4007158 (1977-02-01), Murayama et al.
Murayama et al. -- Chem. Abs. 82, 73923f (1975).

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