Triphenyl phosphite
Chemical compound
From Wikipedia, the free encyclopedia
Triphenyl phosphite is the organophosphorus compound with the formula P(OC6H5)3. It is a colourless viscous liquid.
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| Names | |
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| Preferred IUPAC name
Triphenyl phosphite | |
| Identifiers | |
3D model (JSmol) |
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| ChemSpider | |
| ECHA InfoCard | 100.002.645 |
PubChem CID |
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| UNII | |
CompTox Dashboard (EPA) |
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| Properties | |
| C18H15O3P | |
| Molar mass | 310.28 g/mol |
| Appearance | colourless liquid |
| Density | 1.184 g/mL |
| Melting point | 22 to 24 °C (72 to 75 °F; 295 to 297 K) |
| Boiling point | 360 °C (680 °F; 633 K) |
| low | |
| Solubility | organic solvents |
| −183.7·10−6 cm3/mol | |
| Hazards | |
| Occupational safety and health (OHS/OSH): | |
Main hazards |
flammable |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Preparation
Triphenylphosphite is prepared from phosphorus trichloride and phenol in the presence of a catalytic amount of base:
- PCl3 + 3 HOC6H5 → P(OC6H5)3 + 3 HCl
Reactions
Triphenylphosphite is a precursor to trimethylphosphine, it serves as a source of P3+ that is less electrophilic than phosphorus trichloride:[1]
- (C6H5O)3P + 3 CH3MgBr → P(CH3)3 + 3 "MgBrOC6H5"
Triphenylphosphite is quaternized by methyl iodide:[2]
- (C6H5O)3P + CH3I → [CH3(C6H5O)3P]+I−
Coordination complexes
Triphenylphosphite is a common ligand in coordination chemistry. It forms zero-valent complexes of the type M[P(OC6H5)3]4 (M = Ni, Pd, Pt). The nickel complex can be prepared by displacement of the diene from bis(cyclooctadiene)nickel:[3]
- Ni(COD)2 + 4 P(OC6H5)3 → Ni[P(OC6H5)3]4 + 2 COD
Related complexes are homogeneous catalysts for the hydrocyanation of alkenes. It also forms a variety of Fe(0) and Fe(II) complexes such as the dihydride H2Fe[P(OC6H5)3]4.[4]
Polyamorphism
Triphenylphosphite is a notable example of polyamorphism in organic compounds, namely it exists in two different amorphous forms at temperatures about 200 K.[5] One polymorphic modification of triphenyl phosphite was obtained by means of crystallization in ionic liquids.[6]