Enzymatic process for preparing organosilicon group...

Chemistry: molecular biology and microbiology – Micro-organism – tissue cell culture or enzyme using process... – Preparing oxygen-containing organic compound

Reexamination Certificate

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Details

C435S128000, C435S129000, C435S132000, C435S136000, C556S430000, C556S436000, C556S437000, C556S450000

Reexamination Certificate

active

07005281

ABSTRACT:
The invention relates to a process for preparing organosilicon group containing photoinitiators of the formula (I), wherein m is a number from 1 to 200; q is 0 or 1; A is IN-C(O)—O—CHR3—Y— or IN-C(O)—NH—CHR3—Y—; A′ is A or R1′; R1and R1′, R2and R2′ are C1–C18alkyl or phenyl, or —(O)q—SiR1R1′R2; R3is hydrogen or C1–C6alkyl, Y is a divalent group selected from C1–C10alkeylene, C2–C10alkenylene or —(CH2)b—O—(CH2)a—; and b are each independently of the other a number of 1 to 6; IN is a photolabile functional moiety of the formula (II) or (III), wherein R4is hydrogen or —C(O)—C(O)—OH or —C(O)—C(O)—OC1–C6alkyl and n is 1–3; R5and R6are C1–C12alkyl or together are cycloC5–C7alkyl; R7is hydroxy, C1–C6alkoxy or morpholinyl; X is —(CH2)a—, —(CH2)b—O—(CH2)a— or —(CH2)b—O—CO—(CH2)a—; a and b are each independently of the other a number of 1 to 6; whereby the process is characterized in that a photolabile functional moiety containing a carboxy group (IN-COOH) or an alkoxycarbonyl group (IN-CO—OC1–C6alkyl) is reacted with a carbinol- or amino terminated organosilicon compound of the formula (IV), wherein m, R1and R1′, R2and R2′ are as defined above and B is —Y—CHR3—OH or —Y—CHR3—NH2; B′ is B or R1′, in the presence of an enzyme which catalyzes the esterification, transesterification or amidation reaction.

REFERENCES:
patent: 6288129 (2001-09-01), Gruning et al.
patent: 6376568 (2002-04-01), Baudin et al.
patent: 1072326 (2001-01-01), None
patent: 02/14439 (2002-02-01), None
Derwent Abstr. 1992-361390 [44] for JP 4262794 (1992).
R. Tor et al., Enzyme Microb. Technol., (1990), vol. 12, pp. 299-304.
W. Shi et al., Journal of Applied Polymer Science, vol. 59, No. 12, (1996), pp. 1937-1944.

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