Rhodium, di-mu-chlorobis((1,2,5,6-eta)-1,5-cyclooctadiene)di-

Chloro(1,5-cyclooctadiene)rhodium(I) dimer is an air-stable yellow-orange crystalline solid that serves as a versatile precursor in homogeneous catalysis. Its dimeric structure features two rhodium(I) centers, each coordinated to a 1,5-cyclooctadiene ligand through four contiguous carbons (??-hapticity), with two chlorine atoms bridging the metal centers. The compound is soluble in common organic solvents such as chloroform, dichloromethane, acetone, and toluene, and is typically stored refrigerated (2–8 °C) to maintain stability; it decomposes upon melting between 243–255 °C. Widely employed in organic synthesis, it facilitates key transformations including hydrogenation, hydroformylation, and cross-coupling reactions.