5-{2-(4-Chloro­phen­yl)-1-[2-(4-chloro­phen­yl)-1-(3,4,5-trimeth­oxy­phen­yl)eth­oxy]eth­yl}-1,2,3-trimeth­oxy­benzene

The title compound, C₃₄H₃₆Cl₂O₇, is a by-product from the reaction of 4-chloro­benzyl­zinc chloride with 3,4,5-trimeth­oxy­benzaldehyde. In each of the two 1,2-diphenyl­ethyl moieties, the two benzene rings are arranged in a trans conformation and make C_ar-C-C-C_ar torsion angles of 163.64 (19) and 174.43 (18)°. The crystal structure is stabilized by van der Waals inter­actions only.

1-Dichloro­acetyl-8a-methyl-1,2,3,4,6,7,8,8a-octa­hydro­pyrrolo­[1,2-a]pyrimidin-6-one

In the title compound, C₁₀H₁₄Cl₂N₂O₂, the five-membered ring adopts an envelope conformation (with the methylene C atom closest to the C—N bridge as the flap), while the conformation of the six-membered ring is close to a twist-boat. In the crystal, mol­ecules are linked by weak C—H...O hydrogen bonds, forming chains along the c-axis direction.

1-(Phenyl­sulfon­yl)naphthalene

In the title compound, C₁₆H₁₂O₂S, the phenyl ring is nearly perpendicular to the naphthalene system [dihedral angle = 80.3 (1)°]. The packing is consolidated by a weak C—H...π inter­action involving neighbouring naphthalene and benzene rings. In addition, there exist two different offset π–π stacking inter­actions between benzene rings and between naphthalene systems of symmetry-related mol­ecules [centroid–centroid distances = 3.876 (9) and 3.566 (4) Å, and slippage = 1.412 and 0.554 Å, respectively.

1-(6-Bromo-3,4-dihydro-2H-1,4-benz­oxazin-4-yl)-2,2-dichloro­ethanone

The title compound, C₁₀H₈BrCl₂NO₂, is a target mol­ecule in our research on herbicide safeners. The oxazine ring has an envelope conformation, with puckering parameters close to ideal values [Q = 0.498 (3) Å, θ = 53.7 (3)° and φ = 253.4 (4)°]. The crystal structure is stabilized by C—H...O, C—H...Cl and C—H...Br inter­actions.