2-Chloro-p-Phenylenediamine

AKA: 615-66-7, 2-Chloro-1, 4-diaminobenzene, 1, 4-Benzenediamine, 4-phenylenediamine, Ursol Brown O, 3-Chloro-4-aminoaniline, 4-Diamino-2-chlorobenzene, 4-benzenediamine, O-Chloro-p-phenylenediamine
Synthetic
Not Clean
Origin2-Chloro-p-phenylenediamine is synthesized from p-phenylenediamine through selective chlorination reactions. It is produced by introducing a chlorine atom into the para-substituted aromatic ring structure.
2-chloro-1,4-phenylenediamine is a diamine that is 1,4-phenylenediamine substituted at position 2 by a chloro group. It has a role as a dye. It is a diamine and a member of monochlorobenzenes. It is functionally related to a 1,4-phenylenediamine. It is a conjugate base of a 2-chloro-1,4-phenylenediaminium.
Formula
C6H7ClN2
Mol. Weight
142.58
CAS #
615-66-7
Form
Liquid
State
Solid; [MSDSonline]
Skin Types
●all-skin-types
Best For
General
Pregnancy & Breastfeeding Safe
No
Allergen Warning
⚠️ PPD (Hair Dye)
Functions
Hair Dyeing
Colors Hair
The paper trail
🔬Peer-reviewed1 paper →
⚖️Regulatory1 listing →
🛡️Safety-assessed0 reviews
Counts, not a verdict. A listing isn't a study. The trail, you decide.
EWG
4
CIR
Safe as used
Pregnancy
No
CIR Safety Findings
Not a Skin Irritant
1 study / 1 not irritating (CIR 107)
Eye Irritant in Testing
1 study / 1 irritating / reactions mild (CIR 107)
Sensitizer in Testing
1 study / 1 sensitizing (CIR 107)
Concentration Guide
CIR lists it as not reported to be in use.
CIR · 2007 survey
Regulatory Status
USA✔ permitted
EU⚠ restricted
JAPAN⚠ restricted
CANADA⚠ restricted
Verified Jun 2026
Data: PubChem · CosIng · EWG · CIR