Process for reducing the chlorine content of organotetraphosphites

1. Process for reducing the chlorine content in an organotetraphosphite of one of the general formulae I and II:

where

R 1 , R 2 , R 3 , R 4 are each independently selected from: —H, —(C 1 -C 12 )-alkyl;

V and W are each independently selected from:

—H, —(C 1 -C 12 )-alkyl, —O—(C 1 -C 12 )-alkyl, —(C 1 -C 12 )-heteroalkyl, —(C 4 -C 20 )-aryl, —(C 4 -C 20 )-aryl-(C 1 -C 12 )-alkyl, —(C 4 -C 20 )-aryl-O—(C 1 -C 12 )-alkyl, —(C 1 -C 12 )-alkyl-(C 4 -C 20 )-aryl, —(C 4 -C 20 )-aryl-COO—(C 1 -C 12 )-alkyl, —(C 4 -C 20 )-aryl-CONH—(C 1 -C 12 )-alkyl, —(C 4 -C 20 )-aryl-CON[(C 1 -C 12 )-alkyl] 2 , -(C 4 -C 20 -heteroaryl, —(C 4 -C 20 )-heteroaryl-(C 1 -C 12 )-alkyl, —(C 3 -C 12 )-cycloalkyl, —(C 3 -C 12 )-cycloalkyl-(C 1 -C 12 )-alkyl, —(C 3 -C 12 )-heterocycloalkyl, —(C 3 -C 12 )-heterocycloalkyl-(C 1 -C 12 )-alkyl, —CO—(C 1 -C 12 )-alkyl, —CO—(C 4 -C 20 )-aryl, —CO—(C 4 -C 20 )-heteroalkyl, —(C 4 -C 20 )-aryl-CO—(C 1 -C 12 )-alkyl, —(C 4 -C 20 )-aryl-CO—(C 4 -C 20 )-aryl;

X and Y are each independently selected from O and N;

where, in the case that X is O, n=1,

and, in the case that Y is O, m=1,

and, in the case that X is N, n=1 or 2,

and, in the case that Y is N, m=1 or 2;

Z is selected from:

—(C 1 -C 14 )-alkyl- , —(C 4 -C 20 )-aryl-, —(C 4 -C 20 )-aryl-(C 1 -C 12 )- alkyl-, —(C 1 -C 14 )-heteroalkyl-, —(C 4 -C 20 )-heteroaryl-, —CO—(C 4 -C 14 )-heteroaryl-, —CO—(C 4 -C 20 )-aryl-, —(C 3 -C 12 )-cycloalkyl-, —(C 3 -C 12 )-heterocycloalkyl-, —(C 4 -C 20 )-aryl-CO—(C 4 -C 20 )-aryl-, —(C 1 -C 14 )-alkyl-O—(C 1 -C 14 )-alkyl-;

where the alkyl, heteroalkyl, cycloalkyl, heterocycloalkyl, aryl and heteroaryl groups mentioned are optionally mono- or polysubstituted;

comprising the following process steps:

a) contacting the organotetraphosphite with a solution comprising at least one solvent and at least one base, where the at least one solvent is selected from aromatics, alcohols, acetone, ethyl acetate, acetonitrile and ethers, and where the at least one base is selected from amine bases, alkoxides, pyridine, pyridine derivatives, N-methyl-2-pyrrolidone, triethylamine and triethanolamine,

b) adjusting the temperature to a value in the range from −20° C. to +15° C.,

c) removing the purified organotetraphosphite.

2. Process according to claim 1 ,

wherein the at least one solvent is selected from acetonitrile, ethyl acetate, ethanol, propanol, toluene.

3. Process according to claim 1 ,

wherein the solution with which the organotetraphosphite is contacted in step a) contains, as well as the at least one solvent and the at least one base, also max. 5% water based on the solvent content.

4. Process according to claim 1 ,

wherein the at least one base is selected from triethylamine and dimethylaininobutane.

5. Process according to claim 1 ,

where X and Y are O.

6. Process according to claim 1 ,

where X and Y are N.

7. Process according to claim 1 ,

where V and W are each independently selected from:

—H, —(C 1 -C 12 )-alkyl, —O—(C 1 -C 12 )-alkyl, —(C 4 -C 20 )-aryl, —(C 4 -C 20 )-aryl-(C 1 -C 12 )-alkyl, —(C 4 -C 20 )-aryl-O—(C 1 -C 12 )-alkyl, —(C 1 -C 12 )-alkyl-(C 4 -C 20 )-aryl, —(C 4 -C 20 )-aryl-COO—(C 1 -C 12 )-alkyl.

8. Process according to claim 1 ,

where V and W are, or just one of the substituents V and W is,

where R 5 , R 6 , R 7 , R 8 , R 9 are independently selected from —H, —(C 1 -C 12 )-alkyl,

—O—(C 1 -C 12 )-alkyl, -phenyl, —COO—(C 1 -C 12 )-alkyl.

9. Process according to claim 1 ,

where Z is selected from:

where R 10 , R 11 , R 12 , R 13 , R 14 , R 15 , R 16 , R 17 are each independently selected from:

—H, —(C 1 -C 12 )-alkyl, —O—(C 1 -C 12 )-alkyl, —O—(C 6 -C 20 )-aryl, —(C 6 -C 20 )-aryl, -halogen (such as Cl, F, Br, I), COO—(C 1 -C 12 )-alkyl, CONH—(C 1 -C 12 )-alkyl, —(C 6 -C 20 )-aryl-CON[(C 1 -C 12 )-alkyl] 2 , —CO—(C 1 -C 12 )-alkyl, —CO—(C 6 -C 20 )-aryl, —COOH, —OH, —SO 3 H, —SO 3 Na, —NO 2 , —CN, —NH 2 , —N[(C 1 -C 12 )-alkyl] 2 .

10. Process according to claim 1 ,

wherein the organotetraphosphite used in process step a) has a chlorine content of 1500 ppm to 100 000 ppm.

11. Process according to claim 1 ,

wherein the purified organotetraphosphite has a chlorine content of <1000 ppm.

12. Process according to claim 1 ,

where R 1 , R 3 , R 4 are —H.

13. Process according to claim 1 ,

where R 2 is tert-butyl.

14. Process according to claim 1 ,

where the organotetraphosphite has one of the structural formulae III, IV, V, VI, VII, VIII, IX, X, XI, XII, XIII, XIV and XV: