Pentacarbonyl(1,2,3,4-tetracyclohexylcyclotetraphosphane-P)chromium(0), [Cr(CO)5(chexP)4]

Pentacarbonyl(tetracyclohexylcyclotetraphosphane)chromium(0) crystallizes in the triclinic space group P\overline{1}, Z = 2. The Cr octahedron is slightly distorted. The distance Cr—C trans to the P atom is shortened to 1.845 (2) A compared to the average of 1.899 A for the remaining four. The P4 ring is bent, the P atoms lie 0.33 A alternating out of their least squares plane. The cyclohexyl residues reveal a chair conformation and an all-trans configuration with respect to the P4 ring. They are connected equatorially to the P atoms.