Chromogenic lactams

Details Chromogenic lactams Chromogenic lactams

1993-03-10

1994-11-08

Rizzo, Nicholas

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

Organic compounds

Chalcogen in the nitrogen containing substituent

544 95, 544 54, C07D26512

Patent

active

053628721

ABSTRACT:
The invention relates to chromogenic lactams, to their preparation and to the use thereof in pressure-sensitive or heat-sensitive recording materials.
The novel lactams have the general formula I ##STR1## wherein the ring A is an aromatic or heteroaromatic radical containing 6 ring atoms;

REFERENCES:
patent: 3509147 (1970-04-01), Houlihan
Chemical Abstracts vol. 120 54549(a) 1993.
Journal of the Chemical Society 1965 Abramowitz et al. pp. 2165-2173.

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