3-[(4-amino-o-tolyl)azo]naphthalene-1,5-disulphonic acid is a complex organic compound with the chemical formula C18H16N4O5S2. It is a derivative of naphthalene, featuring a disulfonic acid group and an azo linkage with a 4-amino-o-tolyl group. 3-[(4-amino-o-tolyl)azo]naphthalene-1,5-disulphonic acid is known for its potential applications in the field of chemistry, particularly in the synthesis of dyes and pigments due to its chromophoric properties. The presence of the amino group and the disulfonic acid groups contribute to its solubility and reactivity, making it a versatile building block for the creation of various colorants. The compound's structure allows for the formation of strong color through the interaction of light, which is a characteristic that is exploited in the production of industrial and commercial colorants.

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Basic information
1. Product Name: 3-[(4-amino-o-tolyl)azo]naphthalene-1,5-disulphonic acid
2. Synonyms: 1,5-Naphthalenedisulfonic acid, 3-(2-(4-amino-2-methylphenyl)diazenyl)-; 3-((4-Amino-2-methylphenyl)azo)-1,5-naphthalenedisulfonic acid; 1,5-Naphthalenedisulfonic acid, 3-((4-amino-2-methylphenyl)azo)-; 3-((4-Amino-o-tolyl)azo)naphthalene-1,5-disulphonic acid; 3-[(E)-(4-amino-2-methylphenyl)diazenyl]naphthalene-1,5-disulfonic acid; 3-(4-amino-2-methyl-phenyl)azonaphthalene-1,5-disulfonic acid
3. CAS NO:84-94-6
4. Molecular Formula: C₁₇H₁₅N₃O₆S₂
5. Molecular Weight: 421.4475
6. EINECS: 201-575-2
7. Product Categories: N/A
Chemical Properties
1. Melting Point: N/A
2. Boiling Point: N/A
3. Flash Point: N/A
4. Appearance: N/A
5. Density: 1.61g/cm³
6. Refractive Index: 1.712
7. Storage Temp.: N/A
8. Solubility: N/A
9. CAS DataBase Reference: 3-[(4-amino-o-tolyl)azo]naphthalene-1,5-disulphonic acid(CAS DataBase Reference)
10. NIST Chemistry Reference: 3-[(4-amino-o-tolyl)azo]naphthalene-1,5-disulphonic acid(84-94-6)
11. EPA Substance Registry System: 3-[(4-amino-o-tolyl)azo]naphthalene-1,5-disulphonic acid(84-94-6)
Safety Data
1. Hazard Codes: N/A
2. Statements: N/A
3. Safety Statements: N/A
4. WGK Germany:
5. RTECS:
6. HazardClass: N/A
7. PackingGroup: N/A
8. Hazardous Substances Data: 84-94-6(Hazardous Substances Data)

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Check Digit Verification of cas no

The CAS Registry Mumber 84-94-6 includes 5 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 2 digits, 8 and 4 respectively; the second part has 2 digits, 9 and 4 respectively.
Calculate Digit Verification of CAS Registry Number 84-94:
(4*8)+(3*4)+(2*9)+(1*4)=66
66 % 10 = 6
So 84-94-6 is a valid CAS Registry Number.

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