| 摘要 |
Preparation of novel mono(indolylethylenyl) phthalides is disclosed. Specifically, these compounds are chromogenic mono(indolylethylenyl)phthalides of the formula (see formula I) wherein A is as hereinafter defined and selected from moieties of the type (see formula II, III, IV, V) -28- wherein L is an indole moiety as hereinafter defined; wherein B is a moiety of the type as hereinafter defined. The process disclosed comprises condensing indolylethylene with a keto acid or its derivative and an electron acceptor in an organic solvent. -29-
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