Benzofuran derivatives, process for preparing them and their use

Details Benzofuran derivatives, process for preparing them and their use Benzofuran derivatives, process for preparing them and their use

1975-11-14

1977-08-02

Rush, Raymond V.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

25230128, 25230124, 542432, 26034622, 26034671, C07D27110

Patent

active

040395553

ABSTRACT:
Condensation of a benzofuran, which is substituted in 2-position by a carboxylic acid hydrazide group bound to the benzofuran nucleus via a bridgemember being in conjugation with the double bonds of the benzofuran, with a benzofuran-2-carboxylic acid halide yields a bisacyl hydrazide which is capable of oxdiazol ring closure while splitting off water. The so-obtained oxdiazoles are optical brighteners, especially for polyester materials.

REFERENCES:
patent: 3772373 (1973-11-01), Schlapfer et al.
patent: 3900419 (1975-08-01), Schlapfer et al.
Matsuo et al.-C.A. 78, 45070z (1973).

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