Triethylphosphine
Chemical compound From Wikipedia, the free encyclopedia
Triethylphosphine is the organophosphorus compound with the formula P(CH2CH3)3, commonly abbreviated as PEt3. It is a colorless liquid with an unpleasant odor characteristic of alkylphosphines. The compound is a common ligand in organometallic chemistry, such as in auranofin.
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| Names | |
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| Preferred IUPAC name
Triethylphosphane | |
| Identifiers | |
3D model (JSmol) |
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| ChEBI | |
| ChemSpider | |
| ECHA InfoCard | 100.008.245 |
| EC Number |
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| 2485 | |
PubChem CID |
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| UNII | |
CompTox Dashboard (EPA) |
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| Properties | |
| C6H15P | |
| Molar mass | 118.160 g·mol−1 |
| Appearance | colorless liquid |
| Density | 0.802 g/cm3 |
| Boiling point | 127–128 °C (261–262 °F; 400–401 K) |
| Hazards | |
| GHS labelling: | |
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| Danger | |
| H224, H225, H250, H314 | |
| P210, P222, P233, P240, P241, P242, P243, P260, P264, P280, P301+P330+P331, P302+P334, P303+P361+P353, P304+P340, P305+P351+P338, P310, P321, P363, P370+P378, P403+P235, P405, P422, P501 | |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Structure and simple reactions
It is a pyramidal molecule with approximate C3v symmetry.[1]
PEt3 is usually prepared using Grignard reagents:
- 3 CH3CH2MgCl + P(OC6H5)3 → P(CH2CH3)3 + 3 C6H5OMgCl
PEt3 reacts with strong acids to give salts [HPEt3]X.[2] This reaction is reversible. Similarly, it is also easily alkylated to give phosphonium derivatives. PEt3 is easily oxidised to the phosphine oxide with oxygen.
Coordination chemistry
Triethylphosphine is a highly basic ligand that forms coordination complexes with many metals. As a ligand, triethylphosphine's Tolman cone angle is 132°.[3] Being a relatively compact phosphine, several can bind to a single transition metal, as illustrated by the existence of Pt(PEt3)4.[4] As a phosphine ligand, triethylphosphine gained acceptance earlier than did the simpler trimethylphosphine, as illustrated by the preparation of the hydride complex trans-PtHCl(PEt3)2.[5]
Safety
PEt3 is toxic. It converts to a low toxicity phosphine oxide upon treatment with sodium hypochlorite or hydrogen peroxide.
References
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