Claims
- 1. A process for making a 4,5-polymethylene-4-isothiazolin-3-one by reacting a compound of general formula I ##STR8## with an oxidising agent in a solvent, wherein R.sup.1 and R.sup.2 taken together, and R.sup.3 and R.sup.4 taken together, independently represent a polymethylene chain having 3 or 4 carbon atoms;
- R.sup.5 and R.sup.7 are both hydrogen; and
- R.sup.6 and R.sup.8 are independently hydrogen, hydrocarbyl or substituted hydrocarbyl.
- 2. A process for making a compound of general formula IV ##STR9## by reacting a compound of general formula V ##STR10## with an oxidising agent in a solvent wherein R.sup.1 and R.sup.2 taken together represent a polymethylene chain having 3 or 4 carbon atoms; and
- R.sup.6 is hydrogen, hydrocarbyl or substituted hydrocarbyl.
- 3. A process as claimed in claim 1 wherein the oxidising agent is an oxyhalide of sulphur.
- 4. A process as claimed in claim 1 wherein the oxidising agent is sulphuryl chloride.
- 5. A process as claimed in claim 1 wherein the solvent is a mixture of a strong organic acid and a halogenated aliphatic hydrocarbon.
- 6. A process as claimed in claim 5 wherein the strong organic acid is formic acid.
- 7. A process as claimed in claim 5 wherein the halogenated aliphatic hydrocarbon is methylene chloride.
- 8. A process for making a compound of general formula V ##STR11## by reacting a compound of general formula IV with a reducing agent in a solvent wherein
- R.sup.1 and R.sup.2 taken together represent a polymethylene chain having 3 or 4 carbon atoms or a Polymethylene chain having 3 or 4 carbon atoms substituted by at least one lower alkyl radical having from 1 to 4 carbon atoms; and
- R.sup.6 is hydrogen, hydrocarbyl or substituted hydrocarbyl.
Priority Claims (1)
Number |
Date |
Country |
Kind |
9020933 |
Sep 1990 |
GBX |
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Parent Case Info
This is a division of application Ser. No. 07/763,276, filed Sep. 20, 1991 now U.S. Pat. No. 5,224,980.
US Referenced Citations (11)
Foreign Referenced Citations (10)
Number |
Date |
Country |
0001193 |
Mar 1979 |
EPX |
0187349 |
Jul 1986 |
EPX |
0342105 |
Nov 1989 |
EPX |
0410726 |
Jan 1991 |
EPX |
295486 |
May 1971 |
DEX |
2821639 |
Mar 1979 |
DEX |
198418 |
Nov 1983 |
JPX |
1532984 |
Nov 1978 |
GBX |
2087388 |
May 1982 |
GBX |
2176187 |
Dec 1986 |
GBX |
Divisions (1)
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Number |
Date |
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Parent |
763276 |
Sep 1991 |
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