Claims
- 1. Process for the manufacture of aminoalkylphosphonic acid esters of the general formula I ##STR21## in which R.sup.1 and R.sup.2 are identical or different and denote an unbranched or branched alkyl radical with 2 to 10 carbon atoms, a cycloaliphatic radical or, together, an alkyl-substituted or unsubstituted propylene radical, a, b and c are identical or different and a and c denote a number from 0 to 5 and b denotes 0 or 1,
- R.sup.3 represents hydrogen, an alkyl radical with 1 to 10 carbon atoms, phenyl or furyl and
- R.sup.4, r.sup.5 and R.sup.6 are identical or different and denote hydrogen or the methyl group, characterised in that a cyanoalkylphosphonic acid ester of the general formula II ##STR22## is hydrogenated catalytically using a nickel catalyst at temperatures of about 20.degree. to 150.degree. C. and the resulting product is freed in a known manner from the catalyst and solvents and is optionally distilled, preferably in a high vacuum.
- 2. Process according to claim 1, characterised in that compounds according to the formula II, in which R.sup.1 and R.sup.2 each denote a branched alkyl radical with the branching in the .alpha.- or .beta.-position to the oxygen atom and with a total of 3 to 8 C atoms, are employed.
- 3. Process according to claim 1, characterised in that compounds according to the formula II, in which R.sup.1 and R.sup.2 are identical, are employed.
- 4. Process according to claim 1, characterised in that compounds according to the formula II, in which R.sup.3 denotes hydrogen, methyl, phenyl or furyl, are employed.
- 5. Process according to claim 1, characterised in that cyanoalkyl-phosphonic acid esters according to the formula II, which contain an unbranched or branched alkylene radical with a total of 1 to 3 carbon atoms between the P atom and the nitrile group, are employed.
- 6. Process according to claim 1, characterised in that the hydrogenation is carried out at temperatures of 60.degree. to 120.degree. C.
- 7. Process according to claim 1, characterised in that the hydrogenation is carried out in the presence of ammonia.
- 8. Process according to claim 1, characterised in that the product obtained by hydrogenation is distilled at a temperature such that boiling points of 150.degree. to 170.degree. C. are not exceeded.
Parent Case Info
This is a continuation of application Ser. No. 415,601 filed on Nov. 14, 1973, now abandoned.
US Referenced Citations (2)
Number |
Name |
Date |
Kind |
3812221 |
Braden et al. |
Mar 1974 |
|
3813456 |
Kerst |
May 1974 |
|
Continuations (1)
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Number |
Date |
Country |
Parent |
415601 |
Nov 1973 |
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