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Ethyltriphenylphosphonium bromide
1. Basic Product Information
Product Name: Ethyltriphenylphosphonium bromide
Abbreviation: ETPPBr
CAS Number: 1530-32-1
Molecular Formula: C??H??BrP
Molecular Weight: 361.27
Synonyms: Triphenylethylphosphonium bromide
Product Category: Organic phosphonium salt, Wittig reaction reagent, organic synthetic intermediate, phase transfer catalyst
2. Physical and Chemical Properties
Physical Indicators
- Appearance: White to off-white crystalline powder
- Odor: Odorless
- Solubility: Soluble in dichloromethane, chloroform, ethanol, methanol; slightly soluble in acetone; insoluble in water, petroleum ether, hexane
- Melting Point: 203–206 °C
- Density (20 °C): 1.23 g/cm3
- Hygroscopicity: Slightly hygroscopic under high humidity conditions
- Aqueous Stability: Stable in neutral cold water; slow hydrolysis occurs under strong alkaline heating
Chemical Characteristics
- Molecular Structure: Quaternary phosphonium salt with one ethyl group and three phenyl groups attached to central phosphorus atom, paired with bromide anion
- Core Reactivity: Classic Wittig reagent precursor; deprotonated by strong bases to generate ethylidene Wittig ylide, which converts aldehydes/ketones into terminal alkenes
- Phase Transfer Catalysis: Acts as lipophilic quaternary phosphonium phase transfer catalyst for biphasic organic synthesis reactions
- Photostability: Mildly light-sensitive; prolonged UV exposure causes slight yellowing and minor decomposition
- Thermal Stability: Stable below 180 °C; decomposes above melting point, releasing irritating organophosphorus and bromide volatile fumes
- Chemical Compatibility: Compatible with anhydrous polar organic solvents; incompatible with strong aqueous alkali, strong oxidants and metal reducing agents
3. Main Application Fields
- Core Application: Wittig Reaction Synthetic Reagent
Primary raw material for the preparation of terminal alkenes via carbonyl olefination; widely used in the synthesis of pharmaceutical intermediates, fine chemicals and natural product skeletons - Phase Transfer Catalyst
High-efficiency phosphonium phase transfer catalyst for biphasic substitution, condensation and cyclization reactions - Laboratory Organic Chemistry Research Substrate
Standard reagent for carbonyl olefination methodology research and organic heterocycle construction - Fine Chemical & Fragrance Intermediate Raw Material
Key building block for synthesizing alkene-containing perfume compounds and cosmetic raw materials
4. Platform Category & Product Group Selection Guide
1) Domestic B2B Platform Category
Recommended Path: Organic Intermediates / Organic Intermediates
Reason: It is a quaternary phosphonium organic synthetic reagent, general fine organic intermediate without exclusive pharmaceutical or catalyst-only classification.
2) English Product Group Dropdown Options
Recommended Selection: Basic Organic Chemicals
Do NOT select Pharmaceutical Chemicals; it is a universal laboratory & industrial synthesis reagent rather than regulated human pharmaceutical bulk drug.
3. Standard Foreign Trade Packaging Specification
1kg aluminum foil vacuum bag for laboratory samples; 25kg fiber drum lined with double PE inner bags for bulk industrial orders; customized packaging specifications are available upon request
5. Quality Specification Table
| Test Item | Standard Requirement |
| CAS Number | 1530-32-1 |
| Molecular Formula | C??H??BrP |
| Appearance | Uniform white crystalline powder without yellow discoloration |
| HPLC Purity | Synthetic Grade ≥99.0%, Lab Reagent Grade ≥99.5% |
| Melting Point | 203–206 °C |
| Water Content (KF Method) | ≤0.20% |
| Single Unknown Impurity | ≤0.10% |
| Total Related Substances | ≤0.40% |
| Heavy Metals (Pb) | ≤10 ppm |
| Standard Storage Package | Light-proof nitrogen-sealed aluminum foil vacuum bag, 25kg PE lined fiber drum |
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