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Representative aromatic amines Aromatic ring Name of parent amines Example benzene: aniline: substituted anilines: phenylenediamines: the antioxidant p-phenylenediamine: toluene: toluidines: the pharmaceutical prilocain: diaminotoluenes: the hair dye ingredient 2,5-diaminotoluene: naphthalene: naphthylamines: the dyes Congo red and Prodan ...
This compound is a common hair dye. Its use is being supplanted by other aniline analogues and derivatives such as 2,5-diamino(hydroxyethylbenzene and 2,5-diaminotoluene). Other popular derivatives include tetraaminopyrimidine and indoanilines and indophenols. Derivatives of diaminopyrazole give both red and violet colours. [8]
In terms of its physical properties, 4,4'-benzidine is poorly soluble in cold water but can be recrystallized from hot water, where it crystallises as the monohydrate. It is dibasic, the deprotonated species has K a values of 9.3 × 10 −10 and 5.6 × 10 −11. Its solutions react with oxidizing agents to give deeply coloured quinone-related ...
Aniline (from Portuguese anil 'indigo shrub', and -ine indicating a derived substance) [6] is an organic compound with the formula C 6 H 5 NH 2.Consisting of a phenyl group (−C 6 H 5) attached to an amino group (−NH 2), aniline is the simplest aromatic amine.
One of the most relevant applications of the substance is the synthesis of 3-(diethylamino)phenol, key intermediate for the preparation of several fluorescent dyes (e.g., rhodamine B). Other uses for the compound include hair dye colorants and stabilizers for chlorine-containing thermoplastics. [4]
Certain azo dyes degrade under reductive conditions to release any of a group of defined aromatic amines. Since September 2003, the European Union has banned the manufacture or sale of consumer goods which contain the listed amines. Since only a small number of dyes produced those amines, relatively few products were actually affected. [4]
IARC has categorized most aromatic amines as known carcinogens. Their use spans several industries including use in pesticides, medications, and industrial dyes. [ 17 ] Aromatic amines have also been found in oxidative (permanent) hair dyes; however due to their potential for carcinogenicity, they were removed from most hair dye formulations ...
4-Aminobiphenyl (4-ABP) is an organic compound with the formula C 6 H 5 C 6 H 4 NH 2.It is an amine derivative of biphenyl.It is a colorless solid, although aged samples can appear colored. 4-Aminobiphenyl was commonly used in the past as a rubber antioxidant and an intermediate for dyes. [5]