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US 4,396,767 AGranted
2,6-Bis(heteroaryl)pyridines
AssigneeSterling Drug Inc.
InventorsPaul J. Schmidt, William M. Hung
Life of this patent
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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.
Claims2
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.
1 more element
Dependencies are inferred from the claim text.