Bis(2,6-dichloro­benz­yl)selane

The title mol­ecule, C₁₄H₁₀Cl₄Se, features a selenide bridge between two dichloro­benzyl units. The dihedral angle between the two benzene rings is 107.9 (16)°. In the crystal, weak π–π face-to-face aromatic inter­actions are observed [centroid–centroid distance between two adjacent (but crystallographically different) phenyl rings = 3.885 (5) Å], providing some packing stability. Short Cl...Cl contacts of 3.41 (2) Å are observed.

1,2-Bis(4-methyl­benz­yl)diselane

The title mol­ecule, C₁₆H₁₈Se₂, features a diselenide bridge between two 4-methyl­benzyl units, in which the central C-Se-Se-C torsion angle is 88.1 (3)°, while the two Se-Se-C-C fragments assume gauche conformations, with torsion angles of -51.8 (5) and 59.1 (4)°. The dihedral angle between the benzene rings is 78.9 (2)°.

6′-Amino-3′-methyl-11H,2′H-spiro­[indeno­[1,2-b]quinoxaline-11,4′-pyrano[2,3-c]pyrazole]-5′-carbonitrile ethanol monosolvate

In the title spiro­indeno­quinoxaline compound, C₂₂H₁₄N₆O·C₂H₆O, the five-membered ring of the indene unit and the pyran ring are perpendicular [89.11 (3)°]. In the crystal, N—H...N hydrogen bonds connect the spiro­indeno­quinoxaline mol­ecules, and the ethanol solvent mol­ecules complete the hydrogen-bond network via O—H...N and N—H...O inter­actions.

rac-Ethyl 4-hy­droxy-4-trifluoro­methyl-6-(2,4,5-trimeth­oxy­phen­yl)-2-thio-1,3-diazinane-5-carboxyl­ate

In the title compound, C₁₇H₂₁F₃N₂O₆S, the hexa­hydro­pyrimidine ring adopts a half-chair conformation: the mean plane formed by the ring atoms excluding the C atom bonded to the eth­oxy­carbonyl group has an r.m.s. deviation of 0.0427 Å and forms a dihedral angle of 66.41 (5)° with the benzene ring. The mol­ecular conformation is stabilized by an intra­molecular hydroxyl O—H...O_carbox­yl hydrogen bond, generating an S(6) ring. In the crystal, pairs of N—H...S and N–H...O hydrogen bonds give rise to the formation of two-dimensional networks lying parallel to the ab plane, which incorporate graph-set motifs R²₂(8) and R²₂(16), respectively.