The first Pd-catalyzed multicomponent reaction of aryl iodides, alkenyl bromides, and strained alkenes has been developed, which allowed us to synthesize a variety of multisubsituted olefins in yields of 45-96% with excellent stereoselectivity. The configuration of the product was controlled by the configuration of the alkenyl bromides. Moreover, this practical methodology employing readily available substrates was found to be tolerant to a wide range of functional groups. Fifty six examples of highly stereoselective tri- or tetrasubstituted olefins have been successfully synthesized via this methodology. Most of the synthesized tetrasubstituted olefins are good aggregation-induced emission (AIE) luminogens.
A new series of octahedral rhodium(III) complexes 1–8 of the type [(Ln)2Rh(dppz)]Cl (n = 1–6) and [(Ln)2Rh(dppz)](PF6) {n = 1, 7, 8; L = 2‐phenylpyridine, with different modifications, as the C,N‐chelating ligand; and dppz = dipyrido[3,2‐a:2′,3′‐c]phenazine} have been synthesized and fully characterized. The photophysical properties of the complexes have been investigated. The single‐crystal X‐ray diffraction structures of five complexes – [(L1)2Rh(dppz)](PF6), [(L2)2Rh(dppz)]Cl, [(L3)2Rh(dppz)](PF6), [(L4)2Rh(dppz)](PF6), and [(L8)2Rh(dppz)](PF6) – have confirmed the anticipated structure and have revealed the effect of substitution on the structure of the complex, which has been reasonably explained through experimental electrochemical characterization. The interaction of complexes 1–8 with calf thymus DNA (CT DNA) has been verified by the fluorescent detection of ethidium bromide (EB) displacement studies. The result clearly suggests that the DNA‐binding abilities of these Rh complexes are not only influenced by the DNA‐intercalator dppz, but are also highly influenced by the electronic and steric properties of the C,N‐chelating ligands.
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