The title compound, [Ru(C47H51O6P3)(C4H6)]·0.5C4H10O, consists of an RuII atom coordinated by 1,1,1-tris-{[bis-(4-meth-oxy-phen-yl)phosphan-yl]meth-yl}ethane in κ3-coordination mode and an η4-coordinating tri-methyl-ene-methane ligand. The complex mol-ecule... ...