Hexa-μ₂-acetato-hexa-n-butyl­hexa-μ₃-oxido-tin(IV) toluene monosolvate

The title compound, [Sn₆(C₄H₉)₆(CH₃COO)₆O₆]·C₇H₈, has one half-toluene mol­ecule and one half-organotin mol­ecule in the asymmetric unit. The latter is situated about an inversion centre and belongs to the class of hexa­meric monoorganooxo­tin carboxyl­ates with a hexa­gonal prismatic or `drum-like' motif of the central tin–oxygen core. Two Sn₃O₃ rings in a flat-chair conformation are linked via six Sn—O bonds and six bridging acetate groups. All Sn atoms have approximate octa­hedral coordination geometry. The Sn—O bonds which are trans to the alkyl group are significantly shorter than the others. One butyl group is disordered over two different sites, with occupancies of 0.9:0.1. Very large atomic displacement parameters of the toluene mol­ecule indicate an unresolvable disorder about the twofold axis.

Diacetatodi-tert-butyltin(IV)

The title compound, [Sn(C₄H₉)₂(CH₃COO)₂], was synthesized in order to study the influence of large organic groups on the mol­ecular structure of diorganotin di­acetates. The title compound exhibits the same structure type as other diorganotin(IV) di­acetates characterized by an unsymmetrical bidentate bonding mode of the two acetate groups to tin. The influence of the t-butyl groups on this mol­ecular structure is expressed in two significant differences: tin—carbon bond lengths are much more longer than in the other di­acetates, as are the additional inter­actions of the acetate groups with the tin atom. Inter­molecular inter­actions are restricted to C—H...O ones similar to those in the other di­acetates, giving rise to a chain-like arrangement of the molecules with the tin atoms and acetate groups in the propagation plane.

3-Methyl­ideneoxolane-2,5-dione

The title compound (itaconic anhydride), C₅H₄O₃, consists of a five-membered carbon–oxygen ring in a flat envelope conformation (the unsubstituted C atom being the flap) with three exocyclic double bonds to two O atoms and one C atom. In contrast to the bond lengths, which are very similar to those in itaconic acid in its pure form or in adducts with other mol­ecules, the bond angles differ significantly because of the effect of ring closure giving rise to strong distortions at the C atoms involved in the exocyclic double bonds. In the crystal, C—H...O inter­actions link the mol­ecules, forming an extended three-dimensional network.