Optically active pentacyclic binuclear diorganotin compounds

Three new optically active compounds bearing two penta-coordinated (tbp) tin atoms in a planar pentacyclic system were prepared from an oxalamide. Two of them were submitted to a NMR detailed study in order to assign their 1H, 13C and 119Sn data. The X-ray analysis of one compound showed a rigid framework with 12 intramolecular hydrogen bonds.