Triisopropylphosphine

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OtherNames = Triisopropylphosphine
PⁱPr₃
Pi-Pr₃
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Section2 = Chembox Properties
Formula = C₉H₂₁P
MolarMass = 160.24 g mol^-1
Appearance = colourless liquid
Density = 0.839 g/mL
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BoilingPt = 81 °C (22 mm Hg)
Solubility = good in alkanes
Section3 = Chembox Hazards
MainHazards = spontaneously flammable
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Triisopropylphosphine is the tertiary phosphine with the formula P(CH(CH₃)₂)₃. Commonly used as a ligand in organometallic chemistry, it is often abbreviated to Pi-Pr₃ or PⁱPr₃. This ligand is one of the most basic alkyl phosphines with a large ligand cone angle of 160. [cite journal | author = C. A. Tolman | title = Steric Effects of Phosphorus Ligands in Organometallic Chemistry and Homogeneous Catalysis | year = 1977 | journal = Chem. Rev. | volume = 77 | issue = 4 | pages = 313-348 | doi = 10.1021/cr60307a002]

Pi-Pr₃ is similar to the more frequently used tricyclohexylphosphine. The triisopropyl derivative however, is a liquid at room temperature and more soluble in hydrocarbons.

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