Patent · US Expired

Bis-(2,4-dinitrophenyl)-methyl-pyridinium and quinolinium compounds

US4245096A · kind A · utility

2Cited by

4References

10Claims

0Family size

Assignee

Boehringer Mannheim GmbH · DE

Inventors

Anselm Rothe · Birkenau, DE
Werner Guthlein · Mannheim, DE
Walter Rittersdorf · Mannheim, DE
Wolfgang Werner · Hersbruck, DE

Key dates

Filing date	Apr 30, 1979
Grant date	Jan 13, 1981
Priority date	—
Expiry date	Apr 30, 1999

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC07D217/10
WIPO fieldOrganic fine chemistry
WIPO sectorChemistry

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; PA1 R.sub.2 can also be hydrogen atom or trifluoromethyl; PA1 R.sub.3 and R.sub.4 are hydrogen or, together with the carbon atoms to which they are attached, represent a benzene ring; and PA1 X.sup..crclbar. is an appropriate acid anion or said compounds are betaines.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.