A highly efficient and stereoselective method for the synthesis of (1Z)-1,2-dihalo-3-vinyl-1,3-dienes featuring palladium-catalyzed coupling of haloalkynes and 2,3-butadienyl acetates was developed. The resulting products were smoothly converted into cis-1,2-dihalostyrene derivatives using the Diels-Alder/aromatization sequence.

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Key indicators: single-crystal X-ray study; T = 296 K; mean (C-C) = 0.004 Å; R factor = 0.024; wR factor = 0.063; data-to-parameter ratio = 13.4.In the title compound, C 10 H 7 NO 2 Se, the two rings are twisted, making a dihedral angle of 12.42 (9) . In the crystal, pairs of molecules are disposed about an inversion center, generating O-HÁ Á ÁO hydrogen-bonded dimers. Related literature

Key indicators: single-crystal X-ray study; T = 296 K; mean (C-C) = 0.007 Å; R factor = 0.047; wR factor = 0.140; data-to-parameter ratio = 13.7.The asymmetric unit of the title salt, [Zn(C 12 ExperimentalCrystal data [Zn(C 12

The title coordination compound, {[Co(C11H15O3)4(C10H8N2)2(H2O)]·7H2O}n, consists of a pair of CoII atoms, four 3-hy­droxy­adamantane-1-carboxyl­ate anions (L), one water mol­ecule, two bridging 4,4′-bipyridine (4,4′-bpy) ligands and seven uncoordinated water mol­ecules. Both of the CoII ions are coordinated in a distorted octa­hedral geometry. Four L ligands bind to each pair of CoII atoms in a plane, two of which bridge the two CoII atoms as bidentate groups while the other two coordinate to a single CoII atom in a monodentate mode. Two half-mol­ecules of 4,4′-bipyridine coordinate the CoII atoms from the upside and underside. The packing features extensice O—H⋯O hydrogen bonding.