Organic compounds -- part of the class 532-570 series – Organic compounds – Carboxylic acids and salts thereof
Patent
1997-03-13
1999-06-08
Gerstl, Robert
Organic compounds -- part of the class 532-570 series
Organic compounds
Carboxylic acids and salts thereof
564 91, C07C20559
Patent
active
059106042
ABSTRACT:
A process for the purification of a compound of general formula I: ##STR1## wherein R.sup.1 is hydrogen or C.sub.1 -C.sub.6 alkyl, C.sub.2 -C.sub.6 alkenyl or C.sub.2 -C.sub.6 alkynyl, any of which may optionally be substituted with one or more substituents selected from halogen and hydroxy; or COOR.sup.4, COR.sup.6, CONR.sup.4 R.sup.5 or CONHSO.sub.2 R.sup.4 ;
REFERENCES:
patent: 4031131 (1977-06-01), Johnson
patent: 5446197 (1995-08-01), Sandison et al.
Brown Stephen Martin
Gott Brian David
Gray Thomas
Tavana Seyed Mehdi
Burkhard Dianne
Gerstl Robert
Zeneca Limited
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