Coumarin compounds

Details Coumarin compounds Coumarin compounds

1973-08-27

1976-03-02

Coughlan, Jr., Paul M.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

260 37N, C07D28524

Patent

active

039417808

ABSTRACT:
The invention relates to compounds of formula I, ##SPC1##
in which either, each of
R.sub.1 and R.sub.2, which may be the same or different, signifies a hydrogen atom or an unsubstituted or substituted (C.sub.1.sub.-7) alkyl or (C.sub.2.sub.-7) alkenyl radical, with the proviso that that when one of R.sub.1 and R.sub.2 signifies a hydrogen atom, the other has a significance other than hydrogen, or
R.sub.1 and R.sub.2, together with the nitrogen atom to which they are attached, from a five or six-membered substituted or unsubstituted heterocyclic ring system,
R.sub.3 signifies a hydrogen atom or an unsubsstituted (C.sub.1.sub.-7) alkyl radical,
R.sub.4 signifies the atoms necessary to complete an aromatic carbocyclic or heterocyclic ring system, which ring system in addition to bearing up to two sulphonic groups is further unsubstituted or further substituted,
M is hydrogen or alkali metal,
n is 1 or 2, and the ring A is further unsubstituted or further substituted, which compounds are useful as water-soluble fluorescent dyes.

REFERENCES:
patent: 3311620 (1967-03-01), Bell et al.
patent: 3461122 (1969-08-01), Wei et al.

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