Carbazole containing benzopyrans

Details Carbazole containing benzopyrans Carbazole containing benzopyrans

1987-03-12

1989-06-20

Ramsuer, Robert W.

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

Organic compounds

Four or more ring nitrogens in the bicyclo ring system

544151, 546196, 548439, 548444, C07D40506, C07D41314

Patent

active

048410500

ABSTRACT:
Benzopyrans of the formula ##STR1## where X is a radical ##STR2## and R.sup.1, R.sup.2, R.sup.3, R.sup.4 and the ring A have the meanings stated in the description, a process for their preparation, and their use in pressure-sensitive or heat-sensitive layers.

REFERENCES:
patent: 3909260 (1975-09-01), Seoka et al.

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