Description

5-Methyl-3-(1,1,3,3-Tetramethylbutyl)Pyrocatechol is a sterically hindered phenolic antioxidant featuring a catechol core substituted with a bulky tert-octyl group and a methyl moiety. It delivers exceptional oxidative stability in demanding high-temperature and long-term aging applications where conventional antioxidants degrade or volatilize prematurely. This compound is essential for formulators in polymer stabilization, specialty lubricants, and high-performance synthetic esters requiring non-volatile, metal-deactivating antioxidant protection.

Application

• Primary antioxidant in high-temperature polyolefins (PP, HDPE) for automotive under-hood components
• Stabilizer for synthetic compressor oils and turbine oils operating above 150°C
• Co-antioxidant with phosphites in engineering thermoplastics (e.g., PBT, PPS) to suppress color formation
• Stabilization of unsaturated polyester resins and vinyl ester matrices in composites
• Additive in high-purity silicone fluids for aerospace hydraulic systems
• Antioxidant component in specialty greases containing lithium complex or polyurea thickeners
• Stabilizer for bio-based ester lubricants (e.g., TMP trioleate) exposed to thermal cycling

Basic Information

Product Name	5-Methyl-3-(1,1,3,3-Tetramethylbutyl)Pyrocatechol
CAS No.	2213-68-5
Molecular Formula	C15H24O2
Molecular Weight	236.35 g/mol
Synonyms	5-Methyl-3-(3,3-dimethylbutyl)catechol; 5-Methyl-3-(1,1,3,3-tetramethylbutyl)-1,2-benzenediol; 5-Methyl-3-neohexylcatechol; 3-tert-Octyl-5-methylcatechol; 5-Methyl-3-(2,2-dimethylpropyl)pyrocatechol; NSC 17191; 5-Methyl-3-(3,3-dimethyl-1-oxobutyl)catechol (incorrect tautomer listing — excluded); 3-(1,1,3,3-Tetramethylbutyl)-5-methylbenzene-1,2-diol; 5-Methyl-3-(3,3-dimethylbutyl)-1,2-dihydroxybenzene
EINECS	218-642-2

Quality Control

Our products undergo rigorous quality testing to ensure compliance with industry standards. Certificates of Analysis (COA) are available upon request. All batches conform to ACS Reagent Grade specifications for identity, purity, and impurity profile, and are manufactured under ISO 9001:2015-certified processes. Testing includes full spectral verification (FT-IR, HPLC), residual solvent analysis (GC), and heavy metals screening (ICP-MS).

Storage

Preserve in a tightly closed container, protected from light. Store at room temperature (15–25°C) in a dry, well-ventilated area. Due to its easily oxidized nature, it is recommended to store under inert atmosphere (nitrogen or argon) after opening. Avoid exposure to moisture and strong oxidizing agents.

Specification

Item	Specification
Appearance	White to off-white crystalline powder
Assay (by HPLC)	≥ 98.5%
Melting Point	84–87°C
Loss on Drying	≤ 0.3%
Residue on Ignition	≤ 0.1%
Heavy Metals (as Pb)	≤ 10 ppm
Chlorinated Compounds	Not detected (by GC-ECD)
Identification (IR)	Conforms to reference spectrum

Note: Specifications can be tailored. Please contact us for the detailed technical data sheet of a specific grade.