New red phosphorescent iridium(III) complex with 4-tert-Butylphenyl-boronic acid of organic borane
A new phosphorescent (CQ-BP)2Ir(acac), (CMQ-BP)2Ir(acac), (BQ-BP)2Ir(acac) was synthesized for organic light-emitting diodes (OLEDs). OLEDs using phosphorescent iridium(III) complexes attract enormous attention because they allow highly efficient electro phosphorescence. The donor-acceptor type ligands for the Iridium(III) complexes were synthesized by Suzuki coupling reaction. The ligands through changes in oxidative addition materials (electron-acceptor) and organic borane (electron-donor) to get the red color were to study the appropriate Iridium(III) complexes. Oxidative addition materials were used such as 2-chloro-4-methylquinoline, 1-chloroisoquinoline and 2-bromoquinoline. 4-tert-Butylphenyl-boronic acid was used as organic borane. The dopant was synthesized by Nonoyama reaction. Red dopants were observed with an emission peak at approximately 600?nm. Iridium(III) complexes were measured by nuclear magnetic resonance (NMR), UV-visible spectroscopy and photoluminescence (PL). The phosphorescence emission maxima were dependent on the electron density of donor and acceptor moiety of the ligands.
Rh(iii)-catalyzed alkynylation: Synthesis of functionalized quinolines from aminohydrazones
Rhodium-catalyzed, chemo- and regioselective synthesis of functionalized quinolines using 2-aminohydrazones and terminal alkynes has been described. The reaction is oxidant/base-free and tolerates a wide variety of functional groups and has been successfu
Kumar, Pradeep,Garg, Vineeta,Kumar, Manoj,Verma, Akhilesh K.
supporting information
p. 12168 - 12171
(2019/10/22)
Simple and Clean Photo-induced Methylation of Heteroarenes with MeOH
Heteroarene methylation utilizing a cheap and safe methylation source without involving transition metals represents an important yet challenging objective. Here, a simple and clean catalyst-free protocol for the methylation of various heteroarenes (including six- and five-membered types) is described under light irradiation. This protocol employs cheap, readily available, and abundant MeOH as both the solvent and the methylation source. It was found that adding dichloromethane (DCM) as a co-solvent could significantly increase the yield of the methylation products. Heteroarenes bearing various functional groups could be methylated and tri-deuteromethylated successfully. Deuterium labeling studies suggested that the newly generated methyl group in the products consisted of two hydrogens from the methyl group and one hydrogen from the OH group in MeOH.
Cu(ii)-promoted three-component coupling sequence for the efficient synthesis of substituted quinolines
The copper-promoted three-component coupling sequence for substituted quinoline formation from aldehydes, anilines and acetone is described. Various 2-arylquinolines were selectively obtained in good yields under mild conditions. The reaction tolerated a wide range of functionalities.