TW360643B - A process for making a 1,2-benzisothiazolin-3-ones - Google Patents
A process for making a 1,2-benzisothiazolin-3-onesInfo
- Publication number
- TW360643B TW360643B TW085102349A TW85102349A TW360643B TW 360643 B TW360643 B TW 360643B TW 085102349 A TW085102349 A TW 085102349A TW 85102349 A TW85102349 A TW 85102349A TW 360643 B TW360643 B TW 360643B
- Authority
- TW
- Taiwan
- Prior art keywords
- formula
- benzisothiazolin
- bisulphite
- bunte salt
- making
- Prior art date
Links
Landscapes
- Thiazole And Isothizaole Compounds (AREA)
Abstract
A process for making a 1,2-benzisothiazolin-3-one of formula 1, which comprises reacting a bisamide of formula 2, in water or an organic liquid containing water with a bisulphite or bisulphite-release agent or mixture thereof at a temperature of from 0 DEG to 100 DEG to form a Bunte salt of formula, wherein M is an alkali metal or ammonium cation, and cyclising the Bunte salt in the presence of alkali to form the 1,2-benzisothiazolin-3-one, wherein R is cycloalkyl containing up to 8 carbon atoms or C1-20-alkyl optionally substituted by phenyl. A process for making a 1,2-benzisothiazolin-3-one of formula 1, which comprises reacting a polysulphide of formula 4; or a bisamide of formula 2 containing a polysulphide of formula 4 in water or an organic liquid containing water with bisulphite or bisulphite-release agent or mixture thereof at a temperature of from 0 DEG C to 100 DEG C to form a Bunte salt of formula, wherein M is an alkali metal or ammonium cation, and cyclising the Bunte salt in the presence of alkali to form the 1,2-benzisothiazolin-3-one, wherein R is as defined in claim 1; and p is 1 or 2. A process for making a 1,2-benzisothiazolin-3-one for formula 1, which comprises treating a mixture of 1,2-benzisothiazolin-3-one of formula 1 and bisamide of formula 5, wherein R is as defined in claim 1; and q is 0, 1 or 2 in water or an organic liquid containing water with bisulphite or bisulphite-release agent or a mixture thereof at a temperature of from 0 DEG C to 100 DEG C to form a Bunte salt of formula, wherein M is an alkali metal or ammonium cation, and cyclising the Bunte salt in the presence of alkali to form the 1,2-benzisothiazolin-3-one.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GBGB9603989.6A GB9603989D0 (en) | 1995-03-17 | 1996-02-26 | Process |
Publications (1)
Publication Number | Publication Date |
---|---|
TW360643B true TW360643B (en) | 1999-06-11 |
Family
ID=57940672
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
TW085102349A TW360643B (en) | 1996-02-26 | 1996-02-28 | A process for making a 1,2-benzisothiazolin-3-ones |
Country Status (1)
Country | Link |
---|---|
TW (1) | TW360643B (en) |
-
1996
- 1996-02-28 TW TW085102349A patent/TW360643B/en not_active IP Right Cessation
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
MM4A | Annulment or lapse of patent due to non-payment of fees |