Shandong Huashang Chemical Co., Ltd. is a high-tech enterprise specializing in the research and development, manufacturing, and sales of fine chemicals. Headquartered in Jinan, Shandong, China, we are committed to delivering high-quality products to our global partners. Currently, over 90% of our products are exported to developed markets, including North America, Europe, Japan, South Korea, and the Middle East.
Product Description
9,10-Dihydro-9-oxa-10-phosphaphenanthrene 10-oxide (CAS: 35948-25-5), commonly abbreviated as DOPO, is an organic phosphorus compound with a unique tricyclic structure. It appears as a white to off-white crystalline powder, odorless, and is a key non-halogen flame retardant intermediate with excellent thermal stability and flame-retardant performance. This compound is widely used in the synthesis of flame-retardant materials, organic synthesis, and pharmaceutical research, and also serves as a research reagent in material science and analytical chemistry studies]. It is environmentally friendly, avoiding the pollution problems caused by halogen-containing flame retardants, making it highly valuable in green flame-retardant material development.
Uses
Flame-Retardant Material Synthesis: A critical intermediate in the production of non-halogen flame retardants, widely used in modifying epoxy resins, polyesters, polyurethanes, and other polymers. It can be grafted onto polymer molecular chains to improve the flame-retardant performance of materials, and is often used in the preparation of flame-retardant composites such as graphene/EP resin composites, playing a synergistic flame-retardant role with other materials. It is also applied in flame-retardant coatings, electronic packaging materials, and fiber materials.
Organic Synthesis & Laboratory Research: Used as a key reagent in organic synthesis reactions, such as addition and substitution reactions, to introduce phosphorus-containing groups into target molecules. In laboratory research, it serves as a reference standard for the detection and analysis of phosphorus-containing flame retardants, and is used in studies on the flame-retardant mechanism of phosphorus-containing compounds and the modification of polymer materials.
Molecular Formula & Structure
- Molecular Formula: C??H?O?P
- Molecular Weight: 216.17 g/mol
- IUPAC Name: 9,10-Dihydro-9-oxa-10-phosphaphenanthren-10-oxide
- Synonyms: DOPO; 9,10-Dihydro-9-oxa-10-phosphaphenanthrene oxide; 9-Oxa-10-phosphaphenanthrene 10-oxide;
- EINECS Number: 252-605-8
- MDL Number: MFCD00014483
- SMILES Code: O=P1OC2C3=CC=CC=C3C=CC=2C1
- Chemical Structure: A tricyclic structure composed of a 9-oxa-10-phosphaphenanthrene ring system, with a phosphorus atom (P=O) as the core, connected to two benzene rings and an oxygen atom to form a stable cyclic structure. This unique structure endows it with excellent thermal stability and flame-retardant activity, which can release free radical scavengers during combustion and promote the formation of carbon residues.
Physical & Chemical Properties
- Appearance: White to off-white crystalline powder, odorless, with no visible impurities.
- Density: 1.38 g/cm3; Melting Point: 118–122 °C.
- Solubility: Slightly soluble in water; soluble in common organic solvents such as ethanol, acetone, benzene, and DMSO; compatible with most organic reaction solvents and polymer monomers.
- Boiling Point: 397.7 °C at 760 mmHg; Flash Point: 194.3 °C.
- Stability: Stable under normal temperature and dry conditions; thermal decomposition temperature above 300 °C, with excellent thermal stability; incompatible with strong oxidizing agents and strong acids; avoid moisture, high temperature, and direct sunlight.
- Toxicity: Low acute toxicity; mild irritation may occur upon direct skin or eye contact; non-carcinogenic and non-mutagenic; safe for handling under standard laboratory and industrial operating conditions.
- pKa: 5.80±0.20 (predicted); LogP: 2.45; PSA: 47.11 ?2.
Synthesis & Storage
- Synthesis: Typically prepared via the Diels-Alder reaction, using o-phenylphenol and phosphorus trichloride as raw materials, followed by cyclization and oxidation reactions, and purification through recrystallization or column chromatography to obtain high-purity products suitable for industrial and research use.
- Storage: Sealed in airtight, light-proof containers; stored at room temperature (or 2–8 °C for long-term storage) in a cool, dry, well-ventilated place; avoid moisture, high temperature, strong oxidants, and strong acids; shelf life is 2–3 years under proper storage conditions.
- Safety: Operate in a well-ventilated environment or fume hood; wear basic protective gear (nitrile gloves, goggles, lab coat) to avoid direct contact with skin and eyes; wash thoroughly with soap and water after handling; dispose of waste in accordance with industrial chemical waste regulations.
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