Description

Bis(2-ethylhexyl) hydrogen phosphite (CAS No. 3658-48-8) is a high-purity organophosphorus compound widely utilized in industrial and research applications. With the molecular formula C₁₆H₃₄O₃P+, this chemical serves as a versatile intermediate in synthesis, stabilizer, and additive formulations. Its unique phosphite structure enhances its utility as a chelating agent, antioxidant, and flame retardant in polymer systems, lubricants, and specialty chemicals. Available in liquid form with a purity of 96% or higher, it is characterized by excellent thermal stability and compatibility with organic matrices. Ideal for researchers and scientists requiring precision-grade reagents for advanced material science, catalysis, or polymer modification studies. Proper handling under inert conditions is recommended due to its sensitivity to moisture and oxidation.

Properties

• CAS Number: 3658-48-8
• Complexity: 212
• IUPAC Name: bis(2-ethylhexoxy)-oxo-phosphonium
• InChI: InChI=1S/C16H34O3P/c1-5-9-11-15(7-3)13-18-20(17)19-14-16(8-4)12-10-6-2/h15-16H,5-14H2,1-4H3/q+1
• InChI Key: ZLMKQJQJURXYLC-UHFFFAOYSA-N
• Exact Mass: 305.22455694
• Molecular Formula: C16H34O3P+
• Molecular Weight: 305.41
• SMILES: CCCCC(CC)CO[P+](=O)OCC(CC)CCCC
• Topological: 35.5
• Monoisotopic Mass: 305.22455694
• Physical Description: Liquid
• Color/Form: Mobile, colorless liquid
• Odor: Mild odor
• Boiling Point: 150 °C at 1 mm Hg
• Solubility: Insoluble in water, hydrolyzes very slowly; miscible with most common organic solvents
• Density: 0.93 g/cu cm at 25 °C
• Vapor Density: Vapor specific gravity: 10.6
• Vapor Pressure: 0.000058 [mmHg]
• Viscosity: 6.6 cSt at 25 °C
• Refractive Index: Index of refraction: 1.4420 at 20 °C/D
• Synonyms: Bis(2-ethylhexyl) phosphite, 3658-48-8, Bis(2-ethylhexyl) phosphonate, BIS(2-ETHYLHEXYL) HYDROGEN PHOSPHITE, Diisooctyl phosphite, Chelex H 8, Di-2-ethylhexyl phosphite, Phosphonic acid, bis(2-ethylhexyl) ester, Bis(2-ethylhexyl) phosphonic acid, Di-2-ethylhexyl hydrogen phosphite, Phosphorous acid, bis(2-ethylhexyl) ester, NSC 2664, J9H3L1N82V, DTXSID2044927, HSDB 2607, NSC-2664, EINECS 222-904-6, BRN 1711893, DTXCID0024927, PHOSPHONIC ACID DI(2-ETHYLHEXYL) ESTER, BIS(2-ETHYLHEXYL) HYDROGEN PHOSPHITE [HSDB], Di2ethylhexyl phosphite, Bis(2ethylhexyl) phosphite, Bis(2ethylhexyl) phosphonate, Di2ethylhexyl hydrogen phosphite, Bis(2ethylhexyl) phosphonic acid, DTXCID90818712, Phosphonic acid, bis(2ethylhexyl) ester, Phosphorous acid, bis(2ethylhexyl) ester, 222-904-6, dtxsid20871037, nocas_871037, bis(2-ethylhexoxy)-oxophosphanium, bis(2-ethylhexyl)phosphite, Bis(2-ethyl-1-hexyl) phosphite, UNII-J9H3L1N82V, MFCD00009490, di(2-ethylhexyl) phosphonate, SCHEMBL329554, CHEMBL3186250, SCHEMBL11301766, NSC2664, ZLMKQJQJURXYLC-UHFFFAOYSA-N, Bis(2-ethylhexyl) phosphite, 96%, Tox21_301682, NCGC00256148-01, Phosphonic acid, di-2-ethyl hexyl ester, CAS-3658-48-8, DB-048976, NS00021136, I10180, Q27281381

Bis(2-ethylhexyl) hydrogen phosphite is primarily employed as a stabilizer in PVC and other polymers to mitigate thermal degradation. It acts as an effective antioxidant in lubricants and synthetic oils, extending operational lifespans. Additionally, its chelating properties make it valuable in metal extraction and catalysis. Researchers also explore its use as a flame retardant synergist in halogen-free systems.

Safety and Hazards

GHS Hazard Statements

• H315 (90.9%): Causes skin irritation [Warning Skin corrosion/irritation]
• H318 (14.3%): Causes serious eye damage [Danger Serious eye damage/eye irritation]
• H319 (76.6%): Causes serious eye irritation [Warning Serious eye damage/eye irritation]
• H335 (74%): May cause respiratory irritation [Warning Specific target organ toxicity, single exposure; Respiratory tract irritation]

Precautionary Statements

• P261, P264, P264+P265, P271, P280, P302+P352, P304+P340, P305+P351+P338, P305+P354+P338, P317, P319, P321, P332+P317, P337+P317, P362+P364, P403+P233, P405, and P501

Hazard Classes and Categories

• Skin Irrit. 2 (90.9%)
• Eye Dam. 1 (14.3%)
• Eye Irrit. 2 (76.6%)
• STOT SE 3 (74%)

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Disclaimer: Sold exclusively for laboratory research. Prohibited for commercial use, diagnostics, or human/animal applications. Buyers assume all compliance liability.