Method of preparing styryl-like compounds

Details Method of preparing styryl-like compounds Method of preparing styryl-like compounds

1976-10-21

1979-04-03

Curtis, Allen B.

Harness for working animal

542455, 542456, 542457, 544 32, 544 89, 2603067R, 260307F, C07D49804, C07D51304

Patent

active

041478622

ABSTRACT:
This invention relates to color-changing styryl-like compounds and the preparing of the same. A compound according to the present invention has, as its principal ring, an indoline ring of 2nd position, and has, at stimulation reversible or irreversible change(s) between a closed ring structure of a non-plane molecular structure indicated by the following chemical formula(1) showing white or pale color, and an open ring structure of a plane molecular structure indicated by the following chemical formula(2) showing vivid visible color: ##STR1## wherein Q, R.sub.1, R.sub.2, R.sub.3, Y, Z, A and X are defined in the detailed specification.

REFERENCES:
patent: 3975379 (1976-08-01), Schmitt
Abramenko, P. I., "Polymethine Dyes . . ." in Chem. Abs. vol. 78, p. 80, 1973, 85893b.

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