Organic compounds -- part of the class 532-570 series – Organic compounds – Azo
Patent
1991-12-05
1992-07-07
Lee, Mary C.
Organic compounds -- part of the class 532-570 series
Organic compounds
Azo
534775, 534778, 534780, 534788, C09B 29039, C09B 2910, C09B 2944
Patent
active
051284570
ABSTRACT:
Newly synthesized chromogenic thiol-indicating benzoisthiazolone derivatives having the structure: ##STR1## where R.sup.1, R.sup.2 and R.sup.3 are as defined in the specification, are useful in the detection of thiols, particularly in an aqueous system. This process comprises contacting the aqueous system with a chromogenic thiol-indicating benzoisothiazolone derivative as described herein. Chromophoric changes due to thiol-mediated reduction of the benzothiazolone derivative then occur. Such changes can be in a solution or on an indicator surface in contact or having been in contact with the aqueous system. The chromophoric changes, due to a bathochromic shift in characteristics light absorption upon reduction of the benzoisothiazolone derivative, are proportional to the amount or rate of appearance of thiols in the aqueous system.
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Albarella James P.
Garling David L.
Hatch Robert P.
Coe Roger N.
Lee Mary C.
Miles Inc.
Powers Fiona T.
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