# US 4,396,767 A · 2,6-Bis(heteroaryl)pyridines

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- Number: US 4,396,767 A
- Document ID: US4396767A
- Status: Granted
- Kind: A
- Application number: 06/244,490
- Filed: 1981-03-16
- Granted: 1983-08-02
- Earliest claimed: 1981-03-16
- Assignees: Sterling Drug Inc.
- Inventors: Paul J. Schmidt; William M. Hung
- Web page: https://patentgrep.com/patent/US4396767A

## CPC

- B41M 5/136: Organic colour formers, e.g. leuco dyes
- C07D 213/38: having only hydrogen or hydrocarbon radicals attached to the substituent nitrogen atom
- C07D 213/55: Acids; Esters
- C07D 455/04: containing a quinolizine ring system condensed with only one six-membered carbocyclic ring, e.g. julolidine
- B41M: PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING, (correction of typographical errors B41J; processes for applying transfer pictures or the like B44C1/16; fluid media for correction of typographical errors by coating C09D10/00; printing textiles D06P)
- C07D: HETEROCYCLIC COMPOUNDS (macromolecular compounds C08)

## Abstract

Novel 4-[4-(substituted-amino)phenyl]- or heteroaryl-2,6-bis(heteroaryl)pyridines which are useful as color formers in pressure-sensitive carbonless duplicating systems and thermal marking systems are prepared by reacting a heteroaryl methyl ketone with a 2-R.sub.4 -4-NR.sub.5 R.sub.6 -benzaldehyde or a heteroaryl aldehyde in the presence of ammonia or an ammonia-releasing agent.

## Claims

### Claim 1

A compound having the formula ##STR12## wherein: Ar is a substitutent having the formula ##STR13## in which: R.sub.1 is hydrogen or non-tertiary lower-alkyl;
X is O or S;
Z is 9-julolidinyl.

### Claim 2 (depends on 1)

A compound according to claim 1 wherein Ar is a substituent having the formula ##STR14## wherein R.sub.1 is hydrogen or non-tertiary lower-alkyl and X is O or S.