Process for preparing symmetrical and unsymmetrical...

Details Process for preparing symmetrical and unsymmetrical... Process for preparing symmetrical and unsymmetrical...

2008-07-08

2008-07-08

Eyler, Yvonne (Department: 1621)

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

Organic compounds

Amino nitrogen containing

C564S300000, C564S259000

Reexamination Certificate

active

11607626

ABSTRACT:
A process for preparing N,N-dihydrocarbylhydroxylamines of the general formula (I)where R1, R2, R3and R4are selected independently from among hydrogen, aliphatic, cycloaliphatic, heteroaromatic and aromatic radicals, or R1and R2and/or R3and R4are joined to form a ring, and not more than one radical among R1, R2, R3and R4is hydrogen, which comprises the steps a) reaction of hydroxylamine H2NOH or a salt of hydroxylamine with a compound of the general formula (II) or (III)where R1, R2, R3and R4are as defined in formula (I), b) hydrogenation of the compound formed in step a) in the presence of a catalyst, c) further reaction of the compound formed in step b) with a compound of the general formula (II) or (III) and hydrogenation of the reaction mixture in the presence of a catalyst and d), if appropriate, reaction of the salt of the dihydrocarbylhydroxylamine formed in step c) with a base.

REFERENCES:
patent: 4876300 (1989-10-01), Seltzer et al.
patent: 5144075 (1992-09-01), Suhadolnik
patent: 0 495 756 (1992-07-01), None

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