TW360643B - A process for making a 1,2-benzisothiazolin-3-ones - Google Patents

A process for making a 1,2-benzisothiazolin-3-ones

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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
Application number
TW085102349A
Other languages
Chinese (zh)
Inventor
Mark Robert James
Original Assignee
Arch Uk Biocides Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from GBGB9603989.6A external-priority patent/GB9603989D0/en
Application filed by Arch Uk Biocides Ltd filed Critical Arch Uk Biocides Ltd
Application granted granted Critical
Publication of TW360643B publication Critical patent/TW360643B/en

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  • 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.
TW085102349A 1996-02-26 1996-02-28 A process for making a 1,2-benzisothiazolin-3-ones TW360643B (en)

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)

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Legal Events

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MM4A Annulment or lapse of patent due to non-payment of fees