Benzopyran derivatives

Details Benzopyran derivatives Benzopyran derivatives

1988-07-19

1990-09-18

Lee, Mary C.

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

Organic compounds

Four or more ring nitrogens in the bicyclo ring system

544130, 544131, 544143, 544151, 546135, 546194, 546196, 548374, 548455, 548524, 548525, 549398, 549399, 549404, 549407, 549408, C07D31100, C07D31158, C07D40504, C07D40506

Patent

active

049580213

ABSTRACT:
Benzopyran derivatives of the formula ##STR1## where X is the radical ##STR2## and R.sup.1, R.sup.2, R.sup.3, R.sup.4 and also the ring A have defined meanings are used in pressure- or heat-sensitive layers.

REFERENCES:
patent: 2800457 (1957-07-01), Green et al.
patent: 2800458 (1957-07-01), Green et al.
patent: 3103404 (1963-09-01), Salvin et al.
patent: 3843384 (1974-10-01), Adachi et al.
patent: 3872023 (1975-03-01), Baum et al.
patent: 3896112 (1975-08-01), Kubota et al.
patent: 4183553 (1980-01-01), Petitpierre
patent: 4187233 (1980-02-01), Petitpierre
patent: 4406816 (1983-09-01), Sliwka
Chemical Abstracts, 98(15), 125819d (1983).

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