Abstract: A 3-indolyl-3-bis-aminophenyl-phthalide compound of the formula ##STR1## wherein R.sub.1 represents alkyl which has at most 12 carbon atoms and is unsubstituted or substituted by halogen, hydroxyl, cyano or lower alkoxy, cycloalkyl, or unsubstituted or substituted phenyl or benzyl wherein the substituents are halogen, nitro, lower alkyl or lower alkoxy,R.sub.2 represents hydrogen, alkyl which has at most 12 carbon atoms and is unsubstituted or substituted by halogen, hydroxyl, cyano or lower alkoxy, cycloalkyl, or benzyl which is unsubstituted or substituted by halogen, nitro, lower alkyl or lower alkoxy, orR.sub.1 and R.sub.2 together with the nitrogen atom linking them represent a 5- or 6-membered heterocyclic radical,X.sub.1 and X.sub.2 independently of one another represent hydrogen, lower alkyl, cycloalkyl, benzyl which is unsubstituted or substituted by halogen, nitro, lower alkyl or lower alkoxy, or acyl having 1 to 8 carbon atoms, and X.sub.

Abstract: A new process for the manufacture of a chromenoindole compound of the general formula ##STR1## which process comprises reacting a carbinol compound of the general formula ##STR2## with a (2-(2'-hydroxyphenyl)-indole compound of the general formula ##STR3## and oxidizing the reaction product to a compound of the formula (1).

Abstract: A heat-sensitive recording material which contains as color former at least one azo compound of the formula ##STR1## WHEREIN D represents a phenyl radical which is unsubstituted or substituted by halogen, alkyl, alkoxy, aryloxy, alkoxycarbonyl, N,N-dialkylaminocarbonyl, acylamino, N-acyl-N-alkylamino or the group ##STR2## wherein each of Y.sub.1 and Y.sub.2 independently represents alkyl or aryl or, together with the nitrogen atom to which they are attached, represent a heterocyclic ring which optionally contains an oxygen atom,X.sub.1 represents hydrogen or alkyl,X.sub.2 represents alkyl, cyanoalkyl or arylmethyl, or X.sub.1 and X.sub.2, together with the nitrogen atom to which they are attached, represent a heterocyclic ring which optionally contains an oxygen atom,X.sub.3 represents alkyl or aryl, and n is 1 or 2; said color former being dispersed or dissolved in a fusible binder layer on a substrate, and the material also containing an electron acceptor substance as a color developer.

Abstract: 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.