Preparation of esterified rhodamine dyes

Details Preparation of esterified rhodamine dyes Preparation of esterified rhodamine dyes

1988-03-11

1990-01-23

Hollrah, Glennon H.

Organic compounds -- part of the class 532-570 series

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

C07D31188

Patent

active

048959618

ABSTRACT:
Completely esterified rhodamine dyes of the formula ##STR1## where R, R.sup.2 and R.sup.4 are independently of one another methyl or ethyl, R.sup.1 and R.sup.3 are independently of one another hydrogen, methyl or ethyl, R.sup.5 and R.sup.6 are independently of one another hydrogen or methyl and A.sup..crclbar. is an anion, are prepared from compounds of the formula II ##STR2## or from the corresponding water addition products by esterification with dialkyl sulfates in solvents by using .gamma.-butyrolactone, alkylene carbonates, dialkyl carbonates, methoxypropyl acetate or dialkyl phthalates as solvent and working in the presence of an excess of a base, based on dialkyl sulfate.

REFERENCES:
patent: 438053 (1890-10-01), Boedeker
patent: 1981516 (1931-10-01), Kyrides
patent: 2153059 (1939-04-01), Eckert et al.
patent: 3767358 (1973-10-01), Stryker
patent: 3849065 (1974-11-01), Schmeidl
Chem. Abstract, 107: 41694a, 1987 (Ger. Pat. No. DE 3,531,272, 3.12.87, filed 9-2-85).

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