Organic compounds -- part of the class 532-570 series – Organic compounds – Carboxylic acids and salts thereof
Reexamination Certificate
2005-01-25
2005-01-25
Richter, Johann (Department: 1621)
Organic compounds -- part of the class 532-570 series
Organic compounds
Carboxylic acids and salts thereof
C562S553000, C562S574000, C562S602000
Reexamination Certificate
active
06846952
ABSTRACT:
A process for producing 4-bromo-2-oxyimino butyric acid, predominantly as the (Z)-isomer of formula (I),wherein R is hydrogen; a linear or branched C1-4alkyl group; a linear or branched C1-4alkyl group substituted by a carboxylic acid or an aryl group; a substituted or unsubstituted cyclic alkyl group of 3-6 carbon atoms or a substituted or unsubstituted aryl group. The product is produced by reacting bromine with a 2-(oxyimino)-3-oxo butyric acid derivative of formula (II)wherein R is as defined above and R1is a tert-butyl group in presence of an organic solvent and in presence of a C1-4alcohol and acetyl bromide at a temperature ranging from about −15° C. to about +15° C. Bromine is used in a proportion of about 0.90 to about 1.35 moles per mole of compound (II), preferably 0.90 to 1.10 moles. The acetyl bromide is used in molar proportions of 0.9 to 2 moles per mole of compound (II), preferably 0.9 to 1.5 moles.
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Abraham Susan Ajay
Deshmukh Sanjay
Kansal Vinod Kumar
Rane Dnyandeo Ragho
Richaria Santosh
Lupin Limited
Pendorf & Cutliff
Puttlitz Karl
Richter Johann
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