10.1080/15421406.2011.600145
The study focuses on the synthesis of new conjugated polymers based on fluorene and their application as a hole injection layer (HIL) in organic light-emitting diode (OLED) devices. The researchers synthesized a series of crosslinkable conjugated copolymers using a Pd-catalyzed polycondensation reaction, specifically the Buchwald-Hartwig reaction. Key chemicals used in the study include 9,9-dioctyl-2,7-dibromofluorene (DODBF), 4-aminobiphenyl, 2-(4-aminophenyl-styryl)pyridine (2-APSP), sodium-tert-butoxide (NaO-Bu), and tris(dibenzylideneacetone) dipalladium (Pd2(dba)3). These chemicals served to create the backbone and functional groups of the conjugated polymers. Additionally, distyrylpyridyl alkyl monomer (DSM) was used as a crosslinking agent to pattern the polymers, which improved their solvent resistance and facilitated the subsequent spin coating of the emitting layer polymer solution. The purpose of these chemicals was to develop novel polymers that could be used as HIL in OLEDs, enhancing device performance and offering advantages such as improved processability and stability.
10.1039/C3976000503a
The study presents a novel method for converting oximes into thio-oximes. The researchers used sodium t-butoxide to generate the thio-oximate anion from benzophenone oxime. This process involved several steps: first, benzophenone oxime was reacted with phenyl isothiocyanate in dimethylformamide (DMF) to form an intermediate oxime thiocarbamate (I). This intermediate was then rearranged to form N-diphenylmethylene-O-phenylthiocarbamoylhydroxylamine (II) under specific conditions, such as stirring in hexane under sunlight or allowing the solid form to remain at room temperature. The final step involved treating compound (II) with sodium t-butoxide in DMF to produce the thio-oximate anion, which was then reacted with 2,4-dinitrofluorobenzene to yield N-(2,4-dinitrophenylthio)diphenylmethyleneamine. The study highlights the synthesis and characterization of these compounds, providing a detailed pathway for the conversion of oximes to thio-oximes, with significant yields and detailed spectral and elemental analysis for product identification.
10.1039/b712227f
The research aims to develop a method for synthesizing indoles with sterically demanding N-substituents using palladium-catalysed tandem aryl and alkenyl C–N bond formation. The study addresses the challenge of synthesizing N-substituted indoles, which are important for their biological and medicinal properties but difficult to produce due to the low nucleophilicity of indole nitrogen atoms. The researchers optimized a catalyst system using Pd(OAc)2, HBF4–PtBu3 ligand, and NaOtBu as base in toluene solvent at 130°C to achieve efficient coupling of bulky amines with dihalogenated styrenes. They demonstrated the versatility of their method by synthesizing a range of indoles with various sterically demanding N-nucleophiles and different styrene substrates. The utility of this method was further highlighted by a short synthesis of the natural product demethylasterriquinone A1, showcasing the potential for creating complex indole-based structures with significant biological functions.