Process for the preparation of trimethine dyestuffs

Details Process for the preparation of trimethine dyestuffs Process for the preparation of trimethine dyestuffs

1991-03-25

1992-06-09

Springer, David B.

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

548454, 576176, C09B 2306

Patent

active

051208580

ABSTRACT:
This invention relates to a process for preparing trimethine dyestuffs of the formula ##STR1## wherein R.sup.1 is lower alkyl; R.sup.2 is hydrogen, alkyl, cycloalkyl, aryl, aralkyl, alkoxy, cycloalkoxy, aryloxy, aralkoxy, fluorinated alkyl, alkanoyl, aroyl, alkoxycarbonyl, aryloxycarbonyl, aralkoxycarbonyl, alkanoylamino, aroylamino, alkylaminocarbonyl, arylaminocarbonyl, alkoxycarbonylamino, alkylsulfonyl, arylsulfonyl, halogen, cyano, nitro, carbamoyl, or sulfonamido, or two R.sup.2 together form a fused benzene ring; n is an integer of from 1 to 4; and A.sup.- is an anion, by reacting a mixture of

REFERENCES:
patent: 1886485 (1932-11-01), Kuhn et al.
patent: 4419511 (1983-12-01), Raue

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