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An intramolecular, gold-catalyzed alkyne hydroarylation results in the formation of the core pyrroloazepinone framework of the hymenin group of oroidin alkaloids. Elaboration of the cyclic adduct via C2-azidation, bromination of the pyrrole, and deprotection set the stage for global reduction with Mo(CO)6resulting in the formation 2-debromohymenin.

An intramolecular Diels–Alder reaction of a silyl-substituted vinylimidazole delivers a diastereomeric mixture of C4-silyl functionalized dihydrobenzimidazoles. Subsequent diastereoselective reduction and elaboration of the lactone gives rise to a polysubstituted tetrahydrobenzimidazole, which, upon oxidative rearrangement, affords a single spirofused imidazolone containing all of the relevant functionality for an approach to the oroidin dimers axinellamine, massadine, and palau’amine.

Recently prepared Ce3(SiS4)2I exhibits a strong room temperature luminescence in the blue region of the visible spectrum associated to a CeIII-5d1→CeIII-4f1electronic transition. In order to approach the emission mechanisms, the La3−xCex(SiS4)2I family has been investigated by optical techniques at 6 and 300 K. At low temperature luminescence of the two crystallographically distinct cerium cations was evidenced along with an intrinsic luminescence of the lanthanum matrix. The influence of the halogenide on the optical properties has been studied through the substitution of iodine by chlorine and bromine which permits us to follow the increase in energy of the 4f–5dgap in the Cl

The title compounds are characterized by EDS, powder and single crystal XRD, neutron powder diffraction (Cr0.5Fe0.5Ga), magnetic measurements, and TB‐LMTO electronic structure calculations.

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.

For Abstract see ChemInform Abstract in Full Text.

For Abstract see ChemInform Abstract in Full Text.

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.