Method for the production of N-cyclic and N,N'-dicyclic ureas and their use as chemical solvents
First Claim
Patent Images
1. A method for the production of ureas of the formula:
- ##STR5## in which Y represents a methylene group or an oxygen atom, m and n representing independently of one another the numbers 1 to 3, whereby n plus m represent the numbers 3 or 4, 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 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;
R1 '"'"' additionally represents hydrogen, or R1 '"'"' represents hydrogen and R2 '"'"' represents a group of the formula;
##STR6## in which R3 and R4 have the meanings of R1 '"'"' and R2 '"'"' as described above, whereby R3 and R4 additionally represent hydrogen, and R5 represents an alkylene group with 2 to 20 C atoms or an alkylene phenylene alkylene group, in which the alkylene groups independently of one another have 1 to 3 C atoms,comprising reacting a urea or a bis urea of the formula;
##STR7## in which R1 '"'"' and R2 '"'"' have the meaning as described above in the presence of a solid base and a phase-transfer catalyst in a diluting agent which is inert under reaction conditions at temperatures of 0°
to 150°
C. with a compound of the formula;
space="preserve" listing-type="equation">X-R.sub.6 -X Vin which R6 represents a straight-chain alkylene group with 4 or 5 C atoms in which the C atom can be replaced in the 2 or 3 position by an oxygen or sulphur atom, and X represents a halogen, sulphonic acid, or hydrogen sulphate leaving group, whereby the --NH2 group of the urea of the formula IV is dialkylated by elimination of both hydrogen atoms through the compound of the formula V by elimination of the X leaving groups through ring closure.
1 Assignment
0 Petitions
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.
68 Citations
5 Claims
-
1. A method for the production of ureas of the formula:
- ##STR5## in which Y represents a methylene group or an oxygen atom, m and n representing independently of one another the numbers 1 to 3, whereby n plus m represent the numbers 3 or 4, 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 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;
R1 '"'"' additionally represents hydrogen, or R1 '"'"' represents hydrogen and R2 '"'"' represents a group of the formula;
##STR6## in which R3 and R4 have the meanings of R1 '"'"' and R2 '"'"' as described above, whereby R3 and R4 additionally represent hydrogen, and R5 represents an alkylene group with 2 to 20 C atoms or an alkylene phenylene alkylene group, in which the alkylene groups independently of one another have 1 to 3 C atoms,comprising reacting a urea or a bis urea of the formula;
##STR7## in which R1 '"'"' and R2 '"'"' have the meaning as described above in the presence of a solid base and a phase-transfer catalyst in a diluting agent which is inert under reaction conditions at temperatures of 0°
to 150°
C. with a compound of the formula;
space="preserve" listing-type="equation">X-R.sub.6 -X Vin which R6 represents a straight-chain alkylene group with 4 or 5 C atoms in which the C atom can be replaced in the 2 or 3 position by an oxygen or sulphur atom, and X represents a halogen, sulphonic acid, or hydrogen sulphate leaving group, whereby the --NH2 group of the urea of the formula IV is dialkylated by elimination of both hydrogen atoms through the compound of the formula V by elimination of the X leaving groups through ring closure. - View Dependent Claims (2, 3, 4, 5)
- ##STR5## in which Y represents a methylene group or an oxygen atom, m and n representing independently of one another the numbers 1 to 3, whereby n plus m represent the numbers 3 or 4, 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;
Specification