Process for preparing nitroxyls of sterically hindered amines

Details Process for preparing nitroxyls of sterically hindered amines Process for preparing nitroxyls of sterically hindered amines

1985-11-20

1987-05-12

Schwartz, Richard A.

Organic compounds -- part of the class 532-570 series

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

546 16, 546192, 548408, 548542, C07D21194

Patent

active

046651853

ABSTRACT:
Nitroxyls of the formula ##STR1## where E.sub.1, E.sub.2, E.sub.3 and E.sub.4 are independently an organic radical so that the carbon atoms to which they are attached are each a quaternary carbon and T is a divalent radical are prepared by the oxidation of the corresponding amine in an inert organic solvent with a hydroperoxide in the presence of a metal carbonyl, metal oxide or metal alkoxide catalyst in high yield and purity. The nitroxyls may be directly reduced to the corresponding hydroxylamines by catalytic hydrogenation. The nitroxyls are useful as polymerization inhibitors and the hydroxylamines as polymer stabilizers.

REFERENCES:
patent: 3634346 (1972-01-01), McKeon et al.
Chemical Abstracts, 95:96608f (1981), [Wang, C., et al., Hua Hsueh Tung Pao 1981, (4), 211-12].
V. Cholvald et al., Collection of Czech. Chem. Comm. 46, 1071 (1981).
Chem. Abst. 65, 8735 (1966).
Handbook Chemistry and Physics, 50th Ed., D-115 (1969).
A. R. Forrester et al., Organic Chemical of Stable Free Radicals, Academic Press, London (1968), p. 208.

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