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2-METHOXYMETHYL-P-PHENYLENEDIAMINE.

Valuable CAS 337906-36-2 / HAIR DYEING

A specialized oxidative hair dye intermediate engineered with a methoxymethyl side chain to reduce allergic sensitization compared to traditional PPD-based dyes. This water-soluble precursor undergoes controlled oxidation reactions to create permanent color pigments within the hair shaft, offering a safer alternative for individuals with known PPD sensitivities.

Summary

hair dyeing

Science

Mechanism of Action

Functions as a primary intermediate in oxidative hair coloring by penetrating the hair cuticle through its small molecular structure. Under alkaline conditions with hydrogen peroxide, it undergoes redox coupling reactions to form large, trapped pigment molecules. The methoxymethyl modification specifically disrupts binding to HLA-DR molecules on immune cells, reducing sensitization potential.

Research

Clinical Evidence

High confidence
Effective range 1.8–2%
Optimal

1.8%

Key findings

  1. 01 Cross-reactivity study showing 48% reaction rate in PPD-allergic subjects at 2.0% versus 84% for standard PPD
  2. 02 LLNA sensitization testing demonstrating moderate sensitizer classification with EC3 value of 4.3%
  3. 03 Safety assessment confirming 1.8% concentration is well-tolerated for eyelash applications

Transparency

Dusting Analysis

Not commonly dusted

Specialized hair dye ingredient with established regulatory limits, not typically subject to cosmetic dusting practices

The Formula

Formulation

Solubility
Water
Optimal pH 9 – 11.5
0 7 14

Stability

Extremely oxygen-sensitive requiring airtight storage. Maintains stability in acidic developer solutions (pH 2.0-5.0) but requires alkaline activation environment for hair cuticle penetration and oxidation.

Synergies

  • Hydrogen peroxide (oxidizing agent)
  • EDTA chelators (metal ion protection)

Conflicts

  • Strong oxidizing agents
  • Metal ions
  • Air/oxygen exposure

Safety

Safety Profile

CIR Status
Not reviewed
Max tested
1.8%
Sensitization risk Moderate

SCCS-approved for hair and eyelash dyes at maximum 1.8% on-head concentration. Regulated under EU Cosmetics Regulation Annex III/292 with significantly lower sensitization potential than conventional PPD alternatives.

Your Skin

Skin Compatibility

No Normal
No Dry
No Oily
No Sensitive
Irritancy Low
Comedogenicity Unknown

Our Assessment

Verdict

Valuable

An engineered improvement over traditional hair dye intermediates, offering reduced sensitization risk while maintaining effective coloring performance within regulated concentrations.

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