Abstract
The syntheses of N-hexylcarbazol-2-yl- and -3-yl-boron- ic acids (1 and 2) are described on a ca. 7 g scale, starting from com- mercially available 2,5-dibromonitrobenzene (4) and carbazole (11), respectively. Compounds 1 and 2 underwent efficient palladi- um-catalyzed cross-coupling reactions under Suzuki-Miyaura con- ditions to yield products 17, 18 and 20. Compound 18 reacted with IrCl3 to give the tris-cyclometalated (pyridin-2-yl)carbazole iridi- um(III) complex 21, the X-ray crystal structure of which is reported.
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