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Chemical product profile

HONGKUN / PRODUCT DIRECTORY

Bromaminic acid | CAS 116-81-4

A brominated anthraquinone intermediate for dye synthesis, combining an amino group and sulfonic-acid functionality with the substitution site used in published Reactive Blue 19 routes; acid form and organic assay need separate confirmation.

CAS116-81-4
Molecular formulaC14H8BrNO5S
Molecular weight382.19 g/mol

Product overview

Bromaminic acid places amino, bromo and sulfonic-acid groups on an anthraquinone framework. The CAS 116-81-4 record refers to the acid formula C14H8BrNO5S. Its monosodium salt is a separate chemical form, an important distinction when comparing product descriptions or calculating a reaction charge. The brominated position provides a connection point for the amination chemistry used in downstream colourant assembly. Qualification should therefore establish the complete substituted anthraquinone identity and a selective organic assay. Water, inorganic residue and insoluble material can be additional purchasing criteria according to the receiving dye process; they should not be hidden within an undifferentiated purity description.

Chemical identity

Chemical name
Bromaminic acid
CAS number
116-81-4
Molecular formula
C14H8BrNO5S
Molecular weight
382.19 g/mol

Application context

Bromaminic acid is an intermediate in anthraquinone dye chemistry. Published routes to C.I. Reactive Blue 19 use the bromo-substituted anthraquinone as a partner for aryl amination, introducing the side-chain-bearing aromatic amine into the colourant structure. The amino and sulfonic-acid substituents are already present on the starting anthraquinone framework.

For a dye producer, useful qualification links the organic identity and assay to the intended condensation and finishing process. Specify whether the order is for free acid or a salt and agree the basis used to calculate active intermediate content. A chromatographic profile can distinguish organic related substances, while separate water, inorganic-residue and insoluble-matter tests address other portions of the sample. Any comparative colour or downstream reaction assessment should use a defined method and a representative reference lot.

Chemistry and synthetic role

The anthraquinone carbonyl framework carries a brominated aromatic position available for the documented amination. The sulfonic-acid group also makes the acid-versus-counterion description relevant to formula and content calculations.

Quality review

Identify acid or salt

Match CAS, formula and counterion information before comparing offered assays.

Use a selective organic assay

Total bromine cannot establish the complete substituted anthraquinone structure or separate organic impurities.

Account for non-organic fractions

Agree water, inorganic residue and insoluble-matter tests where required by the dye process.

Preparing a specification

Specify bromaminic acid CAS 116-81-4, chemical form, assay basis and related-anthraquinone limits. Add water, residue, insolubles and a comparative reaction test when the receiving process requires them.

Packaging and storage

Confirm pack material, closure and net weight for the specified chemical form. Check storage and transport against the selected manufacturer’s SDS.

Documentation

Request identity data, COA, SDS and assay method; confirm counterion or acid-equivalent information, chromatograms and relevant water/residue results.

Procurement questions

Is the monosodium salt covered by this acid CAS?

The acid and monosodium salt have distinct identities. State the required form explicitly.

Can bromine analysis replace an organic assay?

No. It does not establish the whole structure or the related-anthraquinone profile.

How should two commercial offers be compared?

Use the same chemical form and content basis, then compare organic impurities and relevant water, residue and insolubles.

Technical sources
  1. PubChem CAS-resolved identity, CID 22628NCBI / National Library of Medicine
  2. Bromamine acid specificationHindprakash
  3. Intermediate chemicals for dyes appendixU.S. International Trade Commission
  4. Process for C.I. Reactive Blue 19, DE4422160C2Google Patents / patent publication
  5. Synthesis of active blue dyestuff, CN1017805BGoogle Patents / patent publication