74630-08-3Relevant academic research and scientific papers
Organic ligand, preparation method, quantum dot, quantum dot layer and light emitting diode
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Paragraph 0139, (2017/01/19)
The invention provides a quantum dot organic ligand, a preparation method, a quantum dot, a quantum dot layer and a light emitting diode. The quantum dot organic ligand comprises the following structure: R1-(R2)n-R3, wherein R1 is a chelation group capable of chelating with metals; R2 is a group with a conjugation electron pair, and n is 1 or an integer larger than 1; R3 is an organic group. According to the quantum dot organic ligand provided by the invention, the structure has R2, the R2 is the group with the conjugation electron pair, and due to electron delocalization effect of the conjugation electron pair of the R2 group, the electron conduction capability of quantum dots can be improved; therefore, the efficiency of the quantum dot is improved, and lighting voltage is reduced.
Catalytic asymmetric carbong-carbon bond formation via allylic alkylations with organolithium compounds
Perez, Manuel,Fananas-Mastral, Martin,Bos, Pieter H.,Rudolph, Alena,Harutyunyan, Syuzanna R.,Feringa, Ben L.
experimental part, p. 377 - 381 (2012/01/06)
Carbon-carbon bond formation is the basis for the biogenesis of nature's essential molecules. Consequently, it lies at the heart of the chemical sciences. Chiral catalysts have been developed for asymmetric C-C bond formation to yield single enantiomers from several organometallic reagents. Remarkably, for extremely reactive organolithium compounds, which are among the most broadly used reagents in chemical synthesis, a general catalytic methodology for enantioselective C-C formation has proven elusive, until now. Here, we report a copper-based chiral catalytic system that allows carbon-carbon bond formation via allylic alkylation with alkyllithium reagents, with extremely high enantioselectivities and able to tolerate several functional groups. We have found that both the solvent used and the structure of the active chiral catalyst are the most critical factors in achieving successful asymmetric catalysis with alkyllithium reagents. The active form of the chiral catalyst has been identified through spectroscopic studies as a diphosphine copper monoalkyl species.
