| abstract |
Novel dyestuffs containing amino or imino groups and their preparation are provided. n These dyestuffs have the general formula ##STR1## wherein R is --N(R 3 )CH 2 --Z or --NβCH--Z, X is N or CR 6 where R 6 is a hydrogen atom or an optionally substituted alkyl or aryl group, Y is S.sup.β, O.sup.β, N or N.sup.β R 7 where R 7 is a hydrogen atom or an optionally substituted alkyl or aryl group, R 1 , R 1 and R 2 each represent a hydrogen atom or an alkyl group having from 1 to 4 carbon atoms, or R 1 and R 2 together with the nitrogen atom complete a heterocyclic ring, or one of R 1 and R 2 can be hydrogen and the other of R 1 and R 2 can be aryl, Z is a group which comprises both an activating group which contains at least one double bond system and also a ballasting group and R 4 and R 5 each represent optional substituents or form an annelated benzene ring. The new dyestuffs are useful in the photographic field especially in the photographic dye diffusion transfer process for the production of photographic images. |