Synthesis and Crystal Structure of the Tetrabutylbis(3,5-Dichloro-4-Hydroxybenzoato)Distannoxane Dimer, {[(C4H9)2SnO2CC6H2(Cl)2(OH)]2O}2

Reaction of di- n -butyltin oxide with 3,5-dichloro-4-hydroxybenzoic acid yields the title compound which crystallizes as the usual dicarboxylatotetraorganodistannoxane dimer. A crystal structure determination of the compound reveals the presence of a centrosymmetric planar Sn2O2 unit connected to exocyclic Sn atom via two bidentate bridging carboxylate ligands. The remaining two carboxylate ligands are coordinated to the exocyclic Sn atom in the monodentate mode.