catena-Poly[[(tetra­hydro­furan-κO)potas­sium]-di-μ-dimethyl­amido-κ⁴N:N-aluminium-di-μ-dimethyl­amido-κ⁴N:N-potassium-di-μ-dimethyl­amido-κ⁴N:N-aluminium-di-μ-dimethyl­amido-κ⁴N:N]

The title compound, [Al₂K₂(C₂H₆N)₈(C₄H₈O)]_n, formed during the sonochemical reaction between Al(NMe₂)₃ and sodium–potassium alloy in the presence of tetra­hydro­furan (THF). Its asymmetric unit has two inequivalent K⁺ sites. One site is coordinated by a THF ligand, and crystallizes as a one-dimensional polymer with a backbone of catenated AlN₂K rings. A twofold rotation axis bis­ects one K⁺ site and the THF ligand; the second K⁺ site is situated on an inversion centre, resulting in a planar four-coordination by N atoms. The latter symmetry operation generates the second half of the THF mol­ecule and fills out the coordination sphere of the potassium sites. The chains extend along the c-axis direction and zigzag at the THF-coordinated K⁺ sites by an angle of 106.02 (5)°.

3,3′-(1-Oxopropane-1,3-di­yl)bis­(1,3-thia­zolidine-2-thione) chloro­benzene hemisolvate

The title compound, C₉H₁₂N₂OS₄·0.5C₆H₅Cl, which contains two 1,3-thia­zolidine-2-thione rings, is a by-product of the synthesis of 3-acryloyl-1,3-thia­zolidine-2-thione. The dihedral angle between these rings is 79.95 (9)°, with both rings displaying a twisted conformation. The twist angle of the amide group is 5.6 (1)°. In the crystal, the molecules are linked into [001] chains by C—H...O interactions. The chloro­benzene solvent mol­ecule was found to show unresolvable disorder about a centre of inversion and its contribution to the scattering was removed with the SQUEEZE option in PLATON [Spek (2009). Acta Cryst. D65, 148–155].