4-But-oxy-3-(2,4-dichloro-phen-yl)-1-oxaspiro-[4.5]dec-3-en-2-one.

In the title compound, C(19)H(22)Cl(2)O(3), the cyclo-hexane ring adopts a chair conformation. The furan ring plane forms dihedral angles of 81.88 (2) and 50.19 (3)°, respectively, with the benzene ring and the plane formed by the butyl C atoms. The crystal structure is stabilized by weak inter-molecular C-H⋯O hydrogen bonds.

4-Benz-yloxy-3-(2,4-dichloro-phen-yl)-1-oxaspiro-[4.5]dec-3-en-2-one.

In the title compound, C(22)H(20)Cl(2)O(3), the cyclo-hexyl ring adopts a chair conformation. The furanyl ring plane makes dihedral angles of 70.10 (2) and 86.12 (3)° with the 2,4-dichloro-phenyl ring and aromatic ring of the benzyl group, respectively. The crystal structure features weak inter-molecular C-H⋯O and C-H⋯Cl hydrogen bonds.

4-[(6-Chloro-2-pyrid-yl)meth-oxy]-3-(2,4-dichloro-phen-yl)-1-oxaspiro-[4.5]dec-3-en-2-one.

In the title compound, C(21)H(18)Cl(3)NO(3), the cyclo-hexane ring is in a chair conformation. The five-membered ring forms a dihedral angle of 69.89 (2)° with the benzene ring. The dihedral angle between the benzene and pyridine rings is 14.03 (7)°.

Erratum: 4-[(6-Chloro-2-pyrid-yl)meth-oxy]-3-(2,4-dichloro-phen-yl)-1-oxaspiro-[4.5]dec-3-en-2-one. Corrigendum.

The chemical name of the title compound in the paper by Xu, Huang & Guo [Acta Cryst. (2009), E65, o846] is corrected and the structural diagram is updated.[This corrects the article DOI: 10.1107/S1600536809010101.].