Method of synthesizing dyes and precursor compounds therefor

Details Method of synthesizing dyes and precursor compounds therefor Method of synthesizing dyes and precursor compounds therefor

1995-06-07

1997-10-21

Richter, Johann

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

548189, 548187, C07D27724, C07D27726, C07D27728

Patent

active

056797958

ABSTRACT:
A method of synthesizing a compound having a 1,3-thiazolidin-4-one ring appended at the 2-position by a double bond to the active methylene position of a ketomethylene or malononitrile moiety, which comprises reacting the corresponding ketomethylene compound or malononitrile with an isothiocyanate in the presence of a base, reacting the resulting product with a haloacetic acid or haloacetic ester, followed by eliminating water or alcohol to form the 1,3-thiazolidin-4-one ring. A fragment necessary to complete a merocyanine, oxonol, hemicyanine, benzylidene, cinnamylidene or holopolar cyanine dye can be appended to the 1,3-thiazolidin-4-one ring to obtain the desired dye.

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