Patent ID: 7002010

Claim:
A process for the preparation of compounds of the formula I: wherein R 1 and R 2 are each independently of the other C 1 -C 18 alkyl, C 2 -C 18 alkyl which is interrupted by oxygen or by C 1 -C 18 alkyl which is substituted by hydroxy; C 7 -C 12 phenylalkyl, C 7 -C 12 phenylalkyl substituted by hydroxy, C 1 -C 4 alkyl and/or C 1 -C 4 alkoxy; C 5 -C 12 cycloalkyl, C 5 -C 12 cycloalkyl substituted by hydroxy, C 1 -C 4 alkyl and/or C 1 -C 4 alkoxy; or R 1 and R 2 , together with the carbon atom to which they are bonded, form a C 5 -C 8 cycloalkylidene ring unsubstituted or substituted by from 1 to 3 C 1 -C 4 alkyl groups; R 3 is hydrogen, C 1 -C 18 alkyl, C 2 -C 18 alkyl which is interrupted by oxygen or by C 1 -C 18 alkyl which is substituted by hydroxy; C 7 -C 12 phenylalkyl, C 7 -C 12 phenylalkyl substituted by hydroxy, C 1 -C 4 alkyl and/or C 1 -C 4 alkoxy; C 5 -C 12 cycloalkyl, C 5 -C 12 cycloalkyl substituted by hydroxy, C 1 -C 4 alkyl and/or C 1 -C 4 alkoxy; C 1 -C 12 alkoxy, C 5 -C 12 cycloalkoxy, C 2 -C 12 alkenyloxy, C 7 -C 12 phenylalkoxy, C 7 -C 12 phenylalkoxy substituted by hydroxy, C 1 -C 4 alkyl and/or C 1 -C 4 alkoxy; R 4 is C 1 -C 18 alkyl, C 2 -C 18 alkyl which is interrupted by oxygen or by C 1 -C 18 alkyl which is substituted by hydroxy; C 7 -C 12 phenylalkyl, C 7 -C 12 phenylalkyl substituted by hydroxy, C 1 -C 4 alkyl and/or C 1 -C 4 alkoxy; C 5 -C 12 cydoalkyl, C 5 -C 12 cycloalkyl substituted by hydroxy, C 1 -C 4 alkyl and/or C 1 -C 4 alkoxy; R 5 is C 1 -C 18 alkyl, C 2 -C 18 alkyl which is interrupted by oxygen; C 1 -C 18 alkyl which is substituted by hydroxy; R 6 is hydrogen, C 1 -C 18 alkyl, C 2 -C 18 alkyl which is interrupted by oxygen; C 2 -C 18 alkyl which is substituted by hydroxy; or C 7 -C 12 phenylalkyl, which process comprises reacting a compound of the formula II: wherein R 1 , R 2 , R 3 and R 4 are as defined above, R 7 is hydroxy, or C 1 -C 18 alkoxy, R 8 and R 9 are each independently of the other C 1 -C 18 alkyl, C 2 -C 18 alkyl which is interrupted by oxygen or by C 1 -C 18 alkyl which is substituted by hydroxy; C 7 -C 12 phenylalkyl, C 7 -C 12 phenylalkyl substituted by hydroxy, C 1 -C 4 alkyl and/or C 1 -C 4 alkoxy; C 5 -C 12 cycloalkyl, C 5 -C 12 cycloalkyl substituted by hydroxy, C 1 -C 4 alkyl and/or C 1 -C 4 alkoxy; R 10 is hydrogen, C 1 -C 18 alkyl, C 2 -C 18 alkyl which is interrupted by oxygen or by C 1 -C 18 alkyl which is substituted by hydroxy; C 7 -C 12 phenylalkyl, C 7 -C 12 phenylalkyl substituted by hydroxy, C 1 -C 4 alkyl and/or C 1 -C 4 alkoxy; C 5 -C 12 cycloalkyl, C 5 -C 12 cycloalkyl substituted by hydroxy, C 1 -C 4 alkyl and/or C 1 -C 4 alkoxy; M is a r-valent metal cation, and r is 1, 2 or 3, with a compound of the formula III: wherein R 5 is as defined above.