4-(4-chloro-phenylazo)-benzenesulfonic acid is an organic compound with the chemical formula C12H9ClN2O3S. It is a derivative of benzenesulfonic acid, featuring a phenylazo group attached to the 4-position of the benzene ring, and a 4-chlorophenyl group attached to the azo nitrogen. 4-(4-chloro-phenylazo)-benzenesulfonic acid is known for its potential applications in the synthesis of dyes and pigments, as well as in various chemical reactions due to its reactive functional groups. The presence of the sulfonic acid group imparts water-solubility, while the azo linkage and chloro substituent contribute to its color and reactivity.

2491-66-9

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Basic information
1. Product Name: 4-(4-chloro-phenylazo)-benzenesulfonic acid
2. Synonyms: 4-(4-chloro-phenylazo)-benzenesulfonic acid
3. CAS NO:2491-66-9
4. Molecular Formula:
5. Molecular Weight: 296.734
6. EINECS: N/A
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: N/A
6. Refractive Index: N/A
7. Storage Temp.: N/A
8. Solubility: N/A
9. CAS DataBase Reference: 4-(4-chloro-phenylazo)-benzenesulfonic acid(CAS DataBase Reference)
10. NIST Chemistry Reference: 4-(4-chloro-phenylazo)-benzenesulfonic acid(2491-66-9)
11. EPA Substance Registry System: 4-(4-chloro-phenylazo)-benzenesulfonic acid(2491-66-9)
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: 2491-66-9(Hazardous Substances Data)

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Check Digit Verification of cas no

The CAS Registry Mumber 2491-66-9 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 2,4,9 and 1 respectively; the second part has 2 digits, 6 and 6 respectively.
Calculate Digit Verification of CAS Registry Number 2491-66:
(6*2)+(5*4)+(4*9)+(3*1)+(2*6)+(1*6)=89
89 % 10 = 9
So 2491-66-9 is a valid CAS Registry Number.

2491-66-9Upstream product

4340-77-6 4-chloroazobenzene

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