Method for the production of N-cyclic and N,N'-dicyclic ureas and their use as chemical solvents
First Claim
1. A process for the dissolution of a chemical compound by a chemical solvent comprising dissolving a chemical compound in at least one urea of the formula ##STR5## in which R1 and R2 independently of one another denote a straight-chain, branched or cyclic alkyl group having 1 to 22 C atoms, which is unsubstituted or substituted by fluorine atoms;
- nitro groups;
alkenyl- or alkylidene groups having 2 to 6 C atoms;
phenyl groups which are unsubstituted or substituted by fluorine atoms, nitro groups, alkyl groups having 1 to 5 C atoms, alkoxy groups having 1 to 5 C atoms or phenoxy groups;
benzyl or phenylethyl groups which are unsubstituted or substituted by fluorine atoms, nitro groups, alkyl groups having 1 to 5 C atoms, alkoxy groups having 1 to 5 C atoms or phenoxy groups;
alkoxy groups having 1 to 5 C atoms, phenoxy groups which are unsubstituted or substituted by fluorine atoms, nitro groups, alkyl groups having 1 to 5 C atoms, alkoxy groups having 1 to 5 C atoms or phenoxy groups;
or, together with the nitrogen atom, a five or six-member non-aromatic ring which can be broken by an oxygen or sulphur atom;
Y represents a methylene group, an oxygen or sulphur atom, n and m represent independently of one another the numbers 1 to 3, whereby n plus m represent the numbers 3 or 4.
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Accused Products
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 --NH2 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.
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Citations
4 Claims
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1. A process for the dissolution of a chemical compound by a chemical solvent comprising dissolving a chemical compound in at least one urea of the formula ##STR5## in which R1 and R2 independently of one another denote a straight-chain, branched or cyclic alkyl group having 1 to 22 C atoms, which is unsubstituted or substituted by fluorine atoms;
- nitro groups;
alkenyl- or alkylidene groups having 2 to 6 C atoms;
phenyl groups which are unsubstituted or substituted by fluorine atoms, nitro groups, alkyl groups having 1 to 5 C atoms, alkoxy groups having 1 to 5 C atoms or phenoxy groups;
benzyl or phenylethyl groups which are unsubstituted or substituted by fluorine atoms, nitro groups, alkyl groups having 1 to 5 C atoms, alkoxy groups having 1 to 5 C atoms or phenoxy groups;
alkoxy groups having 1 to 5 C atoms, phenoxy groups which are unsubstituted or substituted by fluorine atoms, nitro groups, alkyl groups having 1 to 5 C atoms, alkoxy groups having 1 to 5 C atoms or phenoxy groups;
or, together with the nitrogen atom, a five or six-member non-aromatic ring which can be broken by an oxygen or sulphur atom;
Y represents a methylene group, an oxygen or sulphur atom, n and m represent independently of one another the numbers 1 to 3, whereby n plus m represent the numbers 3 or 4. - View Dependent Claims (2, 3, 4)
- nitro groups;
Specification