Benzopyrans for use in recording systems

Details Benzopyrans for use in recording systems Benzopyrans for use in recording systems

1989-03-16

1990-10-30

Ford, John M.

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

549399, 549406, 549407, C07D31158, C07D31192

Patent

active

049669834

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: 3634414 (1972-01-01), Sureau
patent: 3896112 (1975-07-01), Kubota et al.
Chemical Abstracts, Feb. 8, 1988, vol. 108, No. 6, 39652n.

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