Organic compounds -- part of the class 532-570 series – Organic compounds – Heterocyclic carbon compounds containing a hetero ring...
Patent
1979-04-30
1981-01-13
Jiles, Henry R.
Organic compounds -- part of the class 532-570 series
Organic compounds
Heterocyclic carbon compounds containing a hetero ring...
546333, 546149, 422 56, C07D21326, C07D21510, C07D21512, C07D21710
Patent
active
042450969
ABSTRACT:
Bis-(2,4-dinitrophenyl)-methylpyridinium compounds useful as a pH indicator or for the detection of ammonia having the formula: ##STR1## wherein one of R.sub.1 and R.sub.2 is a bis-(2,4-dinitrophenyl)-methyl radical and the other is a lower alkyl radical;
REFERENCES:
patent: 2632761 (1953-03-01), Cheney
patent: 2764590 (1956-09-01), Kottler et al.
patent: 3290281 (1966-12-01), Weinstein et al.
patent: 3627469 (1971-12-01), Cheng
Guthlein Werner
Rittersdorf Walter
Rothe Anselm
Werner Wolfgang
Boehringer Mannheim GmbH
Harkaway Natalia
Jiles Henry R.
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