Description

Galvinoxyl is a stable, persistent phenoxyl radical widely recognized as a standard reference material and a highly effective radical scavenger. Its unique chemical structure makes it an indispensable tool for studying free radical mechanisms and for calibrating analytical instruments like electron paramagnetic resonance (EPR) spectrometers. This compound is critical for researchers and quality control laboratories in the pharmaceutical, polymer, and advanced materials sectors, where precise measurement and control of radical processes are paramount.

Application

• EPR/ESR Spectroscopy Standard: Primary use as a calibration standard and spin concentration reference for Electron Paramagnetic Resonance (EPR) or Electron Spin Resonance (ESR) spectroscopy.
• Radical Scavenging Studies: Used as a model compound to evaluate the antioxidant capacity and radical quenching efficiency of new materials, pharmaceuticals, and biological systems.
• Polymer Chemistry Research: Employed to study and inhibit radical-mediated polymerization processes, aiding in the development of stabilizers and controlled polymerization techniques.
• Organic Synthesis & Mechanistic Studies: Serves as a radical trap or a reagent in synthetic organic chemistry to investigate reaction pathways and intermediate radical species.
• Material Science: Utilized in the research of magnetic materials and organic semiconductors where stable radicals play a key role in material properties.
• Quality Control Reagent: Acts as a reference material in analytical laboratories to ensure the accuracy and reliability of radical detection methods.

Basic Information

Product Name	Galvinoxyl
CAS No.	2370-18-5
Molecular Formula	C₂₉H₄₁O₂
Molecular Weight	421.64 g/mol
Synonyms	2,6-Di-tert-butyl-α-(3,5-di-tert-butyl-4-oxo-2,5-cyclohexadien-1-ylidene)-p-tolyloxy; Galvinoxyl free radical; Galvinoxyl radical; Persistent phenoxyl radical; 2,6-Di-tert-butyl-α-(3,5-di-tert-butyl-4-oxocyclohexa-2,5-dien-1-ylidene)-p-tolyloxy; EPR standard
EINECS	219-132-0

Quality Control

Our Galvinoxyl is produced and handled under strict quality protocols to ensure high purity and batch-to-batch consistency, essential for its role as a reference standard. Each lot undergoes comprehensive analysis, including assay by HPLC and identity confirmation via spectroscopic methods. A detailed Certificate of Analysis (COA) is provided with every shipment, documenting purity, physical properties, and stability data.

Storage

Preserve in a tightly closed container, protected from light. Store under an inert atmosphere (e.g., nitrogen or argon) at a controlled room temperature (15-25°C) to minimize oxidation and degradation. The container should be kept in a cool, dry, and well-ventilated area away from incompatible materials.

Specification

Item	Specification
Appearance	Dark purple to black crystalline powder
Identification (IR)	Conforms to reference spectrum
Identification (EPR)	Exhibits characteristic radical signal
Assay (HPLC)	≥ 98.0%
Melting Point	158 - 162 °C
Loss on Drying	≤ 0.5 %

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