What is 4-Butylresorcinol CAS 18979-61-8?

4-Butylresorcinol is a substituted resorcinol with a butyl group at the 4-position. It has CAS 18979-61-8, molecular formula C₁₀H₁₄O₂ and a molecular weight of 166.22.

What is 4-Butylresorcinol used for in cosmetics?

It is used as a skin-brightening active in serums, creams and spot-correcting products. It helps reduce hyperpigmentation, melasma and uneven skin tone by inhibiting tyrosinase and melanin formation.

How does 4-Butylresorcinol compare with kojic acid or arbutin?

4-Butylresorcinol is often selected for its strong tyrosinase-inhibiting activity and high potency at low use levels. Product descriptions commonly describe it as more effective than traditional agents such as kojic acid or arbutin for targeted brightening.

How should 4-Butylresorcinol be stored and handled?

Store it in tightly closed, light-protected containers in a cool, dry area. Use powder-handling controls and appropriate PPE during weighing and transfer.

4-Butylresorcinol CAS 18979-61-8

4-Butylresorcinol (Rucinol), CAS 18979-61-8, is a resorcinol-derived skin-brightening active supplied for cosmetic and dermatological applications. Confirm the required assay, then request a quotation with COA/TDS/SDS for bulk supply.

CAS: 18979-61-8
Synonyms: Rucinol, 4-n-Butylresorcinol, 4-Butylbenzene-1,3-diol, 2,4-Dihydroxy-n-butylbenzene, 4-Butyl Resorcinol
Einecs: 606-191-2
Molecular Formula: C₁₀H₁₄O₂
Grade: Cosmetic / dermatological grade, assay typically ≥99.0% (HPLC/GC)
Package: 1 kg aluminum foil bag (inner) in 5–25 kg fiber drum, or customized packing according to customer requirements.

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Product Description

4-Butylresorcinol, CAS 18979-61-8, also known as Rucinol or 4-n-butylresorcinol, is a substituted resorcinol with a butyl group at the 4-position; the EC/EINECS number is 606-191-2.

Synonyms: Rucinol; 4-n-Butylresorcinol; 4-Butylbenzene-1,3-diol; 2,4-Dihydroxy-n-butylbenzene; 4-Butyl Resorcinol.

CAS: 18979-61-8.

Molecular formula: C₁₀H₁₄O₂.

Molecular weight: 166.22.

EC number: 606-191-2.

It is a white to almost white or pale-yellow crystalline powder with a melting point of about 50–55 °C.

The density is about 1.04–1.09 g/cm³ at 25 °C; the log P (n-octanol/water) is about 2.8.

It is freely soluble in DMSO, ethanol and propylene glycol and has a water solubility of about 2–3 g/L at 25 °C.

It is used as a skin-brightening active in serums, creams and spot-correcting products to reduce hyperpigmentation, melasma and uneven skin tone.

It acts mainly by inhibiting tyrosinase and melanin formation and is often combined with niacinamide, vitamin C derivatives, arbutin or tranexamic acid.

It is frequently selected for strong tyrosinase inhibition and high potency at low use levels compared with traditional agents such as kojic acid or arbutin.

Confirm assay, appearance, melting range, related impurities, residual solvents, heavy metals and water content; cosmetic grades are typically specified at 99.0% or higher by HPLC or GC.

Store in tightly closed, light-protected containers in a cool, dry area, preferably at 2–8 °C for long-term storage; use powder-handling controls and suitable PPE.

Confirm the current product-specific specification.

Confirm packaging with the requested quantity and destination requirements.

Document requirements should be confirmed from the current specification, SDS, COA or other product-specific files.

The page is an RFQ entry point and does not state stock, price, MOQ or fixed lead time.

For an RFQ, state the intended use, required specification, quantity, packaging, destination and document needs.

FAQ - Technical & Supply Chain

Q:
What is 4-Butylresorcinol CAS 18979-61-8?

A: 4-Butylresorcinol is a substituted resorcinol with a butyl group at the 4-position. It has CAS 18979-61-8, molecular formula C₁₀H₁₄O₂ and a molecular weight of 166.22.
Q:
What is 4-Butylresorcinol used for in cosmetics?

A: It is used as a skin-brightening active in serums, creams and spot-correcting products. It helps reduce hyperpigmentation, melasma and uneven skin tone by inhibiting tyrosinase and melanin formation.
Q:
How does 4-Butylresorcinol compare with kojic acid or arbutin?

A: 4-Butylresorcinol is often selected for its strong tyrosinase-inhibiting activity and high potency at low use levels. Product descriptions commonly describe it as more effective than traditional agents such as kojic acid or arbutin for targeted brightening.
Q:
Which specifications should be checked for cosmetic-grade 4-Butylresorcinol?

A: Check assay, appearance, melting range, related impurities, residual solvents, heavy metals and water content. Cosmetic grades are typically specified at 99.0% or higher by HPLC or GC.
Q:
How should 4-Butylresorcinol be stored and handled?

A: Store it in tightly closed, light-protected containers in a cool, dry area. Use powder-handling controls and appropriate PPE during weighing and transfer.

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