Method for the production of N-cyclic and N,N'-dicyclic ureas an

Details Method for the production of N-cyclic and N,N'-dicyclic ureas an Method for the production of N-cyclic and N,N'-dicyclic ureas an

1995-01-30

1997-01-28

O'Sullivan, Peter

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

Organic compounds

Four or more ring nitrogens in the bicyclo ring system

544141, 546190, 546208, 546245, 548524, 548538, C07D41302, C07D41102, C07D40302, C07D21102

Patent

active

055979173

ABSTRACT:
A process for the dissolution of chemical compounds by use of ureas in which at least one of the urea's two nitrogen atoms is part of a non-aromatic ring which can be broken by an oxygen or sulphur atom as a chemical solvent, and a method of producing tri- or tetraalkylated ureas or bis ureas wherein at least one of the urea's nitrogen atoms is part of a non-aromatic ring which can be broken by an oxygen or sulphur atom by means of dialkylating the --NH.sub.2 group of a urea with an alkene or alkene arylene alkene dihalogenide, disulphonate or dihydrogen sulphonate in the presence of a solid base and a phase-transfer catalyst.

REFERENCES:
patent: 4835312 (1989-05-01), Itoh
patent: 5169954 (1982-12-01), Hackl et al.
patent: 5218002 (1993-06-01), Stroech
E. M uller, Houben-Weyl, 4th edition, vol. E4, pp. 335-567, with partial English translation (1983).
Chemical Abstracts vol. 112, 198399j (1990) with English translation of Examples 7 and 8 of abstracted patent (JP-B-4-8425).
Chemical Abstracts vol. 104, 58816c (1986).
Beilstein's Handbuch der organischen Chemie, 4, Auflage, vol. 20, El, p. 16, (1935).

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