| 摘要 |
Chromogenic dihydrofuropyridinones of the general formula <IMAGE> wherein R1 and R2 independently of each other are hydrogen, C1-C12 alkyl which is unsubstituted or substituted by halogen, hydroxyl, cyano or lower alkoxy, or are cycloalkyl, benzyl or phenyl, or benzyl or phenyl which are substituted by halogen, nitro, lower alkyl or lower alkoxy; or R1 and R2 together with the nitrogen atom to which they are attached are pyrrolidinyl; X is hydrogen, halogen, lower alkyl, lower alkoxy, benzyl, phenyl, benzyloxy, phenoxy, or benzyl or benzyloxy which are substituted by halogen, nitro, lower alkyl or lower alkoxy; Y is C6-C9alkyl; Z is hydrogen, lower alkyl or phenyl; and the ring A is a pyridine radical and the benzene nucleus B is unsubstituted or substituted by halogen, nitro, lower alkyl, lower alkoxy, amino or lower alkylamino. These compounds are useful color formers for pressure-sensitive or heat-sensitive recording materials and produce, in particular, strong, lightfast blue colorations.
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