The facile preparation of a C 4 -symmteric tetratriazolium salt and its subsequent metalation to generate a series of tetranuclear mesoionic carbene gold(I) complexes is presented. The complete structural characterization of the metallic carbenes and the benefits of cooperative catalysis in the processes of hydroamination and hydrohydrazination of terminal alkynes are discussed.
The reaction of 4-substituted imidazol-2-ylidenes with various electrophiles produces a series of 2,4-functionalized imidazolium salts. Subsequent metalation of these precursors using AuCl(SMe) provides the first examples of highly functionalized abnormal carbenegold(I) complexes. The present protocol introduces a new strategy for the synthesis of metallic abnormal carbenes featuring diverse functional groups.
Se prepararon bis(indolil)escuaraínas como materiales potenciales de óptica no lineal aplicados a la obtención de imagen celular por microscopia de fluorescencia, se estudiaron distintos métodos para aislar y estabilizar a los derivados de escuaraínas, de los cuales el encapsulamiento con oligosacáridos cíclicos (ciclodextrinas) resultó ser el más factible.
Blue-LED light or direct sunlight induces cyclization in tryptamine-quinone hybrid compounds. Formation of a C-C bond between the C-2 atom of the indole and the bromo-naphthoquinone takes place in chloroform solution in air without the need for a photocatalyst. The reaction allows the presence of a bromine atom on the indole ring which can be used for subsequent cross coupling reactions. On the other hand, the bromine atom on the naphthoquinone is strictly necessary for the cyclization to occur. The cyclic products of these reactions are blue pigments with broad absorption in the visible region.
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