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Description
TCI C2101 5'-Chloro-3-hydroxy-2',4'-dimethoxy-2-naphthanilide is a naphthanilide-class compound that combines a 3-hydroxy-2-naphthoic acid core with an aniline ring bearing a chlorine substituent and two methoxy groups. Compounds of this type have traditionally been known in industry as coupling components for azoic dyes, that is, colorants formed directly on the fibre. In the laboratory, this material serves as a building block that supplies a ready-to-use naphthol framework, so researchers can focus immediately on the diazotisation and coupling stages without having to prepare the naphthol core first.
The principal characteristic of this compound is the phenolic hydroxyl group at position three of the naphthalene core, which renders the adjacent position highly active toward electrophilic attack by diazonium salts. The amide group links the naphthol core to the aniline ring and contributes intermolecular hydrogen bonding, which gives the resulting pigments good structural compactness. The two methoxy groups add electron density while also influencing solubility and colour shade, whereas the chlorine atom contributes to solvent resistance. The material is supplied as a solid, so it is stable in storage.
In Indonesian laboratories, this building block is typically used in organic synthesis and dye chemistry work at universities, research institutes and industrial development units. Because the naphthol framework is already assembled, teaching laboratories and research groups can run azo coupling experiments efficiently within limited practical hours. Its solid form makes it straightforward to weigh, dispense and keep on the shelf under the warm, humid ambient conditions common across the region.
Laboratory Applications
Azoic dye synthesis: the compound acts as the coupling component that reacts with diazonium salts to form insoluble azo colorants directly on textile fibres.
Organic pigment research: the amide linkage supplies intermolecular hydrogen bonding, giving the resulting pigment structures the compactness that pigment development studies aim to evaluate.
Electrophilic substitution studies: the phenolic hydroxyl at position three activates the neighbouring ring position, making the molecule a clear model substrate for coupling reaction studies.
Structure–colour relationship work: the two methoxy groups and the chlorine substituent allow researchers to examine how substituents influence colour shade, solubility and solvent resistance.
Building block for further derivatisation: the ready-made naphthol framework lets synthetic chemists proceed straight to diazotisation and coupling rather than constructing the naphthol core themselves.
Specifications
Brand: TCI
CAS number: 92-72-8
Category: Chemistry > Building Blocks > Non-Heterocyclic Building Blocks
Chemical name: 5'-Chloro-3-hydroxy-2',4'-dimethoxy-2-naphthanilide
Physical form: solid
Pack sizes: please refer to the packaging options listed for this catalogue item
Storage: store as a solid under stable, dry laboratory storage conditions
Handling and Storage
Store the material in a tightly closed original container, kept dry and away from direct sunlight and sources of heat or ignition. Because the substance is a solid, it is stable in storage, but containers should be resealed promptly after each use to limit exposure to moisture and airborne contaminants. Handle the powder in a fume hood or a well-ventilated area to avoid dust inhalation, and use suitable gloves, safety glasses and a laboratory coat. Use clean, dry spatulas when weighing to prevent cross-contamination, keep the container clearly labelled, and separate it from strong oxidising agents. Consult the manufacturer's safety data sheet before use and dispose of residues and contaminated materials in accordance with applicable chemical waste procedures.
