Description

21-Methyl-2,5,8,11,14,17,20-Heptaoxadocosane is a high-purity, non-ionic polyether compound, specifically a methyl-capped polyethylene glycol derivative. This chemical is valued for its excellent solubility in water and organic solvents, making it a versatile intermediate and functional additive. It is primarily used by manufacturers in the pharmaceutical, agrochemical, and specialty polymer industries for applications requiring precise molecular weight control and low toxicity.

Application

• Pharmaceutical Intermediate: Used in the synthesis of prodrugs, drug conjugates, and as a solubilizing agent in formulations.
• Polymer & Resin Modification: Acts as a plasticizer, viscosity modifier, or reactive diluent in polyurethane and epoxy resin systems.
• Agrochemical Formulations: Serves as a non-ionic surfactant and adjuvant in pesticides and herbicides to enhance spreading and absorption.
• Chemical Synthesis: Employed as a phase-transfer catalyst or a protecting group in organic synthesis due to its polyether chain.
• Personal Care Products: Functions as a humectant and emollient in cosmetic and skincare formulations.
• Laboratory Research: Utilized as a standard or reagent in chemical research and material science studies.

Basic Information

Product Name	21-Methyl-2,5,8,11,14,17,20-Heptaoxadocosane
CAS No.	100258-43-3
Molecular Formula	C15H32O7
Molecular Weight	324.41 g/mol
Synonyms	Methyl-PEG7; 2,5,8,11,14,17,20-Heptaoxadocosan-21-ol, 2-methyl-; Poly(ethylene glycol) methyl ether (n≈7); MPEG-350; Methoxy polyethylene glycol 350; 3,6,9,12,15,18,21-Heptaoxatritriacontan-1-ol; PEG-7 methyl ether; α-Methyl-ω-hydroxyhepta(oxyethylene)
EINECS	Contact for details

Quality Control

Our 21-Methyl-2,5,8,11,14,17,20-Heptaoxadocosane is manufactured under a strict quality management system. Each batch undergoes rigorous analytical testing, including HPLC, NMR, and Karl Fischer titration, to ensure high purity and consistent molecular weight distribution. Certificates of Analysis (COA) detailing all specifications are available upon request.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated area at room temperature (15-25°C). Due to its hygroscopic nature, the container must be kept tightly sealed to prevent moisture absorption, which can affect product quality.

Specification

Item	Specification
Appearance	Colorless to pale yellow viscous liquid
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 98.0%
Water Content (KF)	≤ 0.5%
Molecular Weight (Avg.)	320 - 330 g/mol
Refractive Index (20°C)	1.455 - 1.465
Density (20°C)	1.10 - 1.15 g/mL

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