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, Z = 2. The Cr octahedron is slightly distorted. The distance Cr-C trans to the P atom is shortened to 1.845 (2) Å compared to the average of 1.899 Å for the remaining four. The P₄ ring is bent, the P atoms lie 0.33 Å 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.

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