Organic compounds -- part of the class 532-570 series – Organic compounds – Heterocyclic carbon compounds containing a hetero ring...
Reexamination Certificate
2005-05-03
2005-05-03
Desai, Rita (Department: 1626)
Organic compounds -- part of the class 532-570 series
Organic compounds
Heterocyclic carbon compounds containing a hetero ring...
C548S310700
Reexamination Certificate
active
06888005
ABSTRACT:
A process for the preparation of 2-phenylbenzimidazole-5-sulphonic acid, characterized in that 3,4-diaminobenzenesulphonic acid is reacted at a pH between 4 and 7 in aqueous solution with 0.9 to 1.5 mol of benzaldehyde per mole of 3,4-diaminobenzenesulphonic acid and with 1.0 to 3.0 mol of SO2per mole of 3,4-diaminobenzenesulphonic acid, or an agent which comprises 1.0 to 3.0 mol of SO2per mole of 3.4-diaminobenzenesulphonic acid, is described.
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Am. Chem. Soc. 79, 427, month unavailable (1957), D. Hein et al, “The Use of Polyphosphoric Acid in the Synthesis of 2-Aryl- and 2-Alkyl-substituted Benzimidazoles, Benzoxazoles and Benzothiazoles”.
Emde Herbert
Kissener Wolfram
Paetz Klaus-Christian
Rauchschwalbe Günter
Bayer Aktiengesellschaft
Desai Rita
Donesvich Jill
Eyl Diderico van
Seng Jennifer R.
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