Description

2,6,7-Trioxa-1-Phosphabicyclo[2.2.2]Octane-4-Carbonyl Chloride, 1-Oxide (9Ci) is a highly reactive and versatile organophosphorus building block, specifically an acyl chloride derivative of a bicyclic phosphate ester. This compound matters for its role as a key intermediate in the synthesis of advanced flame retardants, specialty polymers, and functional materials where phosphorus incorporation is critical for performance. It is primarily needed by R&D chemists and production specialists in the polymer additives, pharmaceutical intermediates, and agrochemical sectors seeking to modify thermal stability and reactivity profiles.

Application

• Flame Retardant Synthon: A crucial intermediate for synthesizing novel, high-efficiency phosphorus-based flame retardants for engineering plastics, epoxy resins, and polyurethane foams.
• Polymer Modification: Used to introduce phosphate ester groups into polymer backbones or side chains to enhance flame retardancy, adhesion, or compatibility.
• Pharmaceutical Intermediates: Serves as a building block in the synthesis of complex molecules for medicinal chemistry and drug discovery programs.
• Agrochemical Synthesis: Employed in the production of advanced pesticides and herbicides where the phosphate moiety is integral to biological activity.
• Ligand and Catalyst Preparation: Useful for preparing specialized phosphorus-containing ligands for catalysis and metal complexation.
• Cross-linking Agent: Can act as a reactive cross-linker in the formulation of specialty coatings and thermoset resins.
• Material Science Research: Key reagent in developing new functional materials, including dendrimers and organic-inorganic hybrids.

Basic Information

Item	Details
Product Name	2,6,7-Trioxa-1-Phosphabicyclo[2.2.2]Octane-4-Carbonyl Chloride, 1-Oxide (9Ci)
CAS No.	120872-19-7
Molecular Formula	C6H6ClO5P
Molecular Weight	224.54 g/mol
Synonyms	4-(Chlorocarbonyl)-2,6,7-trioxa-1-phosphabicyclo[2.2.2]octane 1-oxide; Bicyclo[2.2.2]octane-4-carbonyl chloride, 2,6,7-trioxa-1-phospha-1-oxide; PEPA-acyl chloride; 1-Oxo-2,6,7-trioxa-1-phosphabicyclo[2.2.2]octane-4-carbonyl chloride; PEPA-COCl; Phosphorus heterocycle acyl chloride; Contact for additional synonyms.
EINECS	Contact for details

Quality Control

Our production of 2,6,7-Trioxa-1-Phosphabicyclo[2.2.2]Octane-4-Carbonyl Chloride, 1-Oxide adheres to stringent in-process controls and final batch testing to ensure high purity and consistent reactivity. Each lot is analyzed to confirm identity, purity, and the absence of critical impurities. Certificates of Analysis (COA) detailing specifications such as assay (by HPLC or titration), chloride content, and moisture levels are provided and available upon request to support your quality assurance protocols.

Storage

Preserve in a tightly closed container, protected from light. Due to its hygroscopic (moisture-sensitive) nature, store under an inert atmosphere (e.g., nitrogen or argon) in a cool, dry place. Recommended storage temperature is 2-8°C for long-term stability. Keep the container tightly sealed in a dry environment to prevent hydrolysis and degradation.

Specification

Item	Specification
Appearance	White to off-white crystalline powder or solid
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0%
Water Content (KF)	≤ 1.0%
Chloride Content	Confirmatory
Solubility	Soluble in common organic solvents (e.g., THF, DCM)

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