Ciba-Geigy Corporation

Sigmund Gunzenhauser

Heinz Balli

Ian J Fletcher

Davor Bedekovic

Jean C Petitpierre

The invention relates to chromogenic dihydroquinazolines of the general formula: ##STR1## wherein: the ring A is a monocyclic or polycyclic, unsubstituted or substituted heterocyclic radical which may contain further heteroatoms as ring members,

Chromogenic dihydroquinazolines

The invention relates to chromenoazaindolizines of the general formula ##STR1## wherein each of Y, X.sub.1 and X.sub.2 independently of the other is hydrogen, halogen, lower alkyl, lower alkanoylamino or a group of the formula ##STR2## each of R.sub.1, R.sub.2, R.sub.3 and R.sub.4 independently of the other is hydrogen, C.sub.1 -C.sub.12 alkyl which is unsubstituted or substituted by halogen, hydroxy, cyano or lower alkoxy, or is cycloalkyl, phenyl, benzyl, or phenyl or benzyl each substituted by halogen, nitro, lower alkyl or lower alkoxy, or

Chromenoazaindolizine compounds

The invention relates to chromogenic dihydroquinazolines of the general formula ##STR1## wherein the ring A is a monocyclic or polycyclic, unsubstituted or substituted heterocyclic radical which may contain further heteroatoms as ring members,

A chromenoindole compound of the formula ##STR1## wherein R.sub.1 and R.sub.2 independently of one another represent hydrogen, alkyl which has at most 12 carbon atoms and is unsubstituted or substituted by halogen, hydroxyl, cyano or lower alkoxy; cycloalkyl, phenyl, benzyl, or phenyl or benzyl which are substituted by halogen, lower alkyl or lower alkoxy, or R.sub.1 and R.sub.2, together with the nitrogen atom which links them, represent a 5-membered or 6-membered heterocyclic radical, Q is hydrogen, lower alkyl, phenyl, benzyl or the groups of the formulae (1a) or (1b) ##STR2## X and X' each represent hydrogen, halogen, lower alkyl or lower alkoxy, Y represents hydrogen, alkyl of 1 to 12 carbon atoms, phenyl or benzyl and the rings A and B independently of one another are unsubstituted or substituted by halogen, nitro, lower alkyl, lower alkoxy, phenoxy, amino or amino substituted by lower alkyl, phenyl or benzyl; these compounds are particularly useful as color formers which give intense red to blue color shades of excellent light fastness when they are brought into contact with an electron acceptor.

Chromenoindole color formers

A chromenoindole compound of the formula ##STR1## wherein R.sub.1 and R.sub.2 independently of one another represent hydrogen, alkyl which has at most 12 carbon atoms and is unsubstituted or substituted by halogen, hydroxyl, cyano or lower alkoxy; cycloalkyl, phenyl, benzyl, or phenyl or benzyl which are substituted by halogen, lower alkyl or lower alkoxy, or R.sub.1 and R.sub.2, together with the nitrogen atom which links them, represent a 5-membered or 6-membered heterocyclic radical, Q is hydrogen, lower alkyl, phenyl, benzyl or the groups of the formulae (1a) or (1b) ##STR2## X and X' each represent hydrogen, halogen, lower alkyl or lower alkoxy, Y represents hydrogen, alkyl of 1 to 12 carbon atoms, phenyl or benzyl and the rings A and B independently of one another are unsubstituted or substituted by halogen, nitro, lower alkyl, lower alkoxy, phenoxy, amino or amino substituted by lower alkyl, phenyl or benzyl; these compounds are particularly useful as colour formers which give intense red to blue colour shades of excellent light fastness when they are brought into contact with an electron acceptor.

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Arlesheim, Switzerland

Sigmund Gunzenhauser