Triisopropylphosphine is the

tertiary phosphine Organophosphines are organophosphorus compounds with the formula PR''n''H3−''n'', where R is an organic substituent. These compounds can be classified according to the value of ''n'': primary phosphines (''n'' = 1), secondary phosphine ...

with the formula P( CH(CH₃)₂)₃. Commonly used as a

ligand In coordination chemistry, a ligand is an ion or molecule with a functional group that binds to a central metal atom to form a coordination complex. The bonding with the metal generally involves formal donation of one or more of the ligand's el ...

organometallic chemistry Organometallic chemistry is the study of organometallic compounds, chemical compounds containing at least one chemical bond between a carbon atom of an organic molecule and a metal, including alkali, alkaline earth, and transition metals, and so ...

, it is often abbreviated to Pi-Pr₃ or PⁱPr₃. This

is one of the most basic alkyl phosphines with a large

ligand cone angle In coordination chemistry, the ligand cone angle (θ) is a measure of the steric bulk of a ligand in a transition metal coordination complex. It is defined as the solid angle formed with the metal at the vertex of a cone and the outermost edge ...

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 Tricyclohexylphosphine is the tertiary phosphine with the formula P( C6H11)3. Commonly used as a ligand in organometallic chemistry, it is often abbreviated to PCy3, where Cy stands for cyclohexyl. It is characterized by both high basicity (p''K ...

. The triisopropyl derivative however, is a liquid at room temperature and more soluble in hydrocarbons.

References

Tertiary phosphines Isopropyl compounds