Hypervalente Bromverbindungen: kleine Analoga von hypervalenten Iodverbindungen oder “Enfants Terribles”?

Abstract

Alkinkupplung · Hypervalente Bromverbindungen · Hypervalente Iodverbindungen · Michael-Additionen · Oxidationen Highlights Schema 5. Alkinkupplungen mit Aryl(alkinyl)-l 3 -bromanen 5.Schema 6. Reaktionen von Aryl(alkinyl)-l 3 -bromanen 5 mit Schwefelnucleophilen.Schema 7. Synthese von Aryl(alkenyl)-l 3 -bromanen 6.Schema 8. Bildung a,b-ungesättigter Carbonylverbindungen 19 aus Alkinen und Ethanol in Gegenwart von Arylbromdifluorid 8.Schema 4. Synthese von p-Trifluormethylphenyl(alkinyl)-l 3 -bromanen 5. Angewandte Chemie

Palladium-catalyzed synthesis of N-arylated carbazoles using anilines and cyclic diaryliodonium salts

“…Cyclic diarylbromonium salts are considerably less explored than their iodonium congeners as can be seen by only a handful of synthetic methods described in the literature [32,36–41]. In general, bromonium salts are more reactive but have similar reaction behaviour [32,36]. Thus they could be helpful substrates for the synthesis of N -arylcarbazoles from anilines.…”

Hypervalent iodine chemistry and light: photochemical reactions involving hypervalent iodine chemistry

“…[1][2][3][4] These reagents are known to achieve various oxidative transformations under mild and environment friendly reaction conditions. [5][6][7][8][9][10][11][12][13][14][15][16][17] Several hypervalent iodine reagents have been identified as potential oxidants. [18][19][20][21][22][23] Additionally, these reagents have been successfully applied to obtain several synthetic transformations including cyclizations, [24][25][26][27][28][29][30] aminations, [31][32][33][34] functionalizations of carbonyl compounds, [35][36][37][38] arylations, [39][40][41] atom-transfer reactions, 42 cycloaddition reactions, [43][44][45] and oxidative rearrangements.…”