LACTONES OF THE DIAZAXANTHENE SERIES AND DYE PRECURSORS FOR COPYING PROCESSES

摘要

1437228 Diazaxanthene lactones BASF AG 4 Sept 1973 [5 Sept 1972] 41467/73 Heading C4P [Also in Division D2] The invention comprises diazaxanthene compounds of the general formula in which R1 and R2 are each independently a hetero ring of the formula or a group -NR3R4 wherein R3 and R4 are each independently H, C 1 -C 6 -alkyl cyano-C 1 - C 6 -alkyl or C 1 -C 6 -hydroxyalkyl, alkoxyalkyl having 2 to 12 carbon atoms, carbalkoxyalkyl having 4 to 11 carbon atoms or phenyl-alkyl having 7 to 12 carbon atoms, X and Y are OH, chlorine or C 1 -C 8 -alkyl, R5 is OH, chlorine, C 1 -C 3 -alkyl, or Z is H, chlorine, nitro, C 1 -C 3 - alkyl, C 1 -C 3 -hydroxyalkyl or C 1 -C 3 -haloalkyl and m and n are each independently 0 or an integer from 1 to 3. They are prepared by condensing a benzoybenzoic acid of the general formula wherein R is H, C 1 -C 4 -alkyl or aryl and R1, X, Y, Z, n and m are as above with a pyrimidine compound of the general formula wherein R1 is H, C 1 -C 4 -alkyl or aryl and R1 and R5 are as defined above in presence of sulphuric acid, polyphosphoric acid, acetic anhydride or zinc chloride at 60-160‹ C. The compounds are used in pressure sensitive recording processes.