Method relating to manufacture of coumarin derivatives

Details Method relating to manufacture of coumarin derivatives Method relating to manufacture of coumarin derivatives

1973-12-19

1976-01-20

Todd, G. Thomas

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

C07D40504

Patent

active

039338479

ABSTRACT:
A coumarin dye of the formula (Ia), ##SPC1##
Wherein R.sub.1 is hydrogen, chlorine or C.sub.1 -C.sub.2 alkyl, R.sub.2 and R.sub.3 are hydrogen or C.sub.1 -C.sub.4 alkyl, or a quarternary salt thereof having the formula (Ib), ##SPC2##
Wherein R.sub.1, R.sub.2 and R.sub.3 are as defined above, R.sub.4 is C.sub.1 -C.sub.2 alkyl or benzyl, and X.sup.- is an anion, is prepared by an improved method, which comprises reacting a diamine of the formula, ##SPC3##
Wherein R.sub.1 is as defined above, with a compound of the formula,

REFERENCES:
patent: 3259619 (1966-07-01), Siegrist et al.
patent: 3617210 (1971-11-01), Dehnert et al.
patent: 3681397 (1972-08-01), Knupfer et al.
Bukowski et al., Chem. Abstracts 75:63691v (1971).

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