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Silyl ethers, a process for their production and their use as polymerization initiators
| Details |
Inventors: Reuter, Knud; Dhein, Rolf;
Assignee: Bayer Aktiengesellschaft (Leverkusen, DE)
Primary Examiner: Schofer; Joseph L.
Assistant Examiner: Kulkosky; Peter F.
Attorney, Agent or Firm: Connolly and Hutz
Silyl ethers obtainable from aryl silyl ketones and mono-, di-, tri- or tetra-chlorosilanes in the presence of base metals are eminently suitable for use as initiators for radical polymerization reactions. |
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DETAILED DESCRIPTION We claim: 1.
Silyl ethers corresponding to the formula: ##STR7## in which R.
sup.
1 and R.
sup.
2 represent phenyl, tolyl, p-tert.
-butyl phenyl, o- and p-chlorophenyl, 2,4-dichlorophenyl, or m-methoxyphenyl, R.
sup.
3 to R.
sup.
8 independently of one another represent methyl, ethyl or phenyl, R.
sup.
9 represents methyl or A, R.
sup.
10 and R.
sup.
11 represent chlorine, methyl or A, R.
sup.
12 represents a silyl radical corresponding to the formula: ##STR8## and A represents a radical corresponding to the formula: ##STR9## the compounds of the formula II optionally containing the partial structure ##STR10## from one to twenty times.
2.
A process for the production of silyl ethers, characterised in that 1 mole of an aryl silyl ketone corresponding to the formula: ##STR11## in which R.
sup.
1, R.
sup.
3, R.
sup.
4 and R.
sup.
5 are as defined in claim 1, and a substantially equivalent quantity of a base metal are reacted in an inert aprotic solvent at -10.
degree.
to 70.
degree.
C.
with about 1 mole of a monochloro-organosilane corresponding to the formula R.
sup.
9 R.
sup.
10' R.
sup.
11' SiCl (VII) or with 0.
4 to 0.
8 mole of a dichloro-organosilane corresponding to the formula R.
sup.
9 R.
sup.
10' SiCl.
sub.
2 (VIII) or with 0.
25 to 0.
6 mole of a trichloro-organosilane corresponding to the formula R.
sup.
9 SiCl.
sub.
3 (IX) or with 0.
1 to 0.
7 mole of a tetrachlorosilane until the exothermic reaction has ceased, the reaction product is hydrolysed, the organic phase is separated off and the solvent removed under a pressure of from 2 to 6 Torr; R.
sup.
9 being as defined in claim 9 and R.
sup.
10' and R.
sup.
11' representing the same substituents as defined in claim 9 for R.
sup.
10 and R.
sup.
11 except for A.
3.
A process as claimed in claim 2, characterised in that the reaction of the aryl silyl ketone (VI) is carried out at a temperature of -5.
degree.
to 50.
degree.
C.
4.
A process as claimed in claim 2, characterised in that 0.
5 to 0.
6 mole of the dichloro-organosilane (VIII) or 0.
3 to 0.
4 mole of the trichloro-organosilane (IX) or 0
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Molecular Biology 
