What is "tricyclohexylphosphine"

Tricyclohexylphosphine is the tertiary phosphine with the formula P( CH). Commonly used as a ligand in organometallic chemistry, it is often abbreviated to PCy, where Cy stands for cyclohexyl. It is characterized by both high basicity (pK = 9.7) and a large ligand cone angle (170°).

Important complexes containing P(Cy) ligands include the 2005 Nobel Prize-winning Grubbs' catalyst and the homogeneous hydrogenation catalyst Crabtree's catalyst.

Image:Grubbs_Catalyst_1st_Generation.svg|Grubbs' catalyst (first generation) Image:Crabtree.png|Crabtree's catalyst