Process for producing di[bis-(indolyl)ethylenyl]tetrahalophthali

Details Process for producing di[bis-(indolyl)ethylenyl]tetrahalophthali Process for producing di[bis-(indolyl)ethylenyl]tetrahalophthali

1990-08-02

1991-08-13

Shen, Cecilia

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

544 581, 544 586, 544142, 544143, 546200, 546201, 548427, 548450, 548451, C07D40500, C07D20956

Patent

active

050398210

ABSTRACT:
Preparation of novel symmetrical and unsymmetrical chromogenic di-[bis-(indolyl)ethylenyl]tetrahalophthalides is disclosed. Specifically these compounds are chromogenic di-[bis-(indolyl)ethylenyl]tetrahalophthalides of the formula ##STR1## wherein L and X are as hereinafter defined. The process disclosed involves condensing bis(indolyl)ethylenes with tetrahalophthalic anhydride in acetic anhydride, in the presence of an electron acceptor or preferably an acetate of Group I or II of the Periodic Table. Optionally, and preferably, where unsymmetrical di-[bis-(indolyl)ethylenyl]tetrahalophthalides are desired, indoles are reacted with an acylindole in the presence of a Vilsmeier reagent to form the starting bis(indolyl)ethylene.

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