1268162-33-9Relevant academic research and scientific papers
Palladium-Catalyzed Direct Decarbonylative Phosphorylation of Benzoic Acids with P(O)–H Compounds
Zhang, Ji-Shu,Chen, Tieqiao,Han, Li-Biao
supporting information, p. 1148 - 1153 (2020/02/27)
A direct decarbonylative phosphorylation of benzoic acids catalyzed by palladium was disclosed. Under the reaction conditions, a wide range of benzoic acids coupled readily with all the three kinds of P(O)–H compounds, i.e. secondary phosphine oxides, H-phosphinates and H-phosphonates, producing the corresponding organophosphorus compounds in good to high yields. This reaction could be conducted at a gram scale and applied in the late-stage phosphorylative modification of carboxylic acids drug molecules. These results well demonstrated the potential synthetic value of this new reaction in organic synthesis.
Asymmetrically difunctionalized dibenzo[b,d]furan-based hole blocking materials for high-performance blue phosphorescent organic light-emitting diodes
Chung, Won Jae,Hong, Soojin,Jang, Seokhoon,Lee, Jun Yeob,Lee, Youngu,Yu, Gyeonghwa
, (2020/05/25)
Many researchers have reported dibenzo[b,d]furan segment as a building block of organic light-emitting diode (OLED) materials because it has high thermal stability and triplet energy. However, most of the research has focused on symmetrically substituting the same functional groups at 2-position due to easy functionalization or substituting the same functional groups at different positions of dibenzo[b,d]furan. Herein, we design and synthesize three new hole blocking materials based on asymmetrically difunctionalized dibenzo[b,d]furan, diphenyl (2-(pyridin-3-yl)dibenzo[b,d]furan-6-yl)phosphine oxide (DBFPO-Py), diphenyl(2-(pyrimidin-5-yl)dibenzo[b,d]furan-6-yl)phosphine oxide (DBFPO-Pyr), and diphenyl(2-(4-(triphenylsilyl)phenyl)dibenzo[b,d]furan-6-yl)phosphine oxide (DBFPO-Si) for high-performance phosphorescent OLEDs. Phosphine oxide, tetraphenylsilane, pyridine, and pyrimidine segments are successfully introduced into the asymmetric position of a dibenzo[b,d]furan. It is found that DBFPO-Py, DBFPO-Pyr, and DBFPO-Si possess high thermal stability; high triplet energies of 2.96, 2.98, and 2.80 eV; and deep highest occupied molecular orbital (HOMO) energy levels of ?7.13, ?7.23 and ?7.07 eV; respectively. Blue phosphorescent OLEDs with DBFPO-Py, DBFPO-Pyr, and DBFPO-Si show low turn-on voltages, high current and power efficiencies, and superior external quantum efficiencies. Blue phosphorescent OLEDs with DBFPO-Py and DBFPO-Pyr showed improved performance in terms of current and power efficiencies, etc, compared with the device with 1,3-bis(3,5-dipyrid-3-yl-phenyl)benzene (BmPyPB), which is commonly used as a hole blocking layer. More importantly, the blue phosphorescent OLEDs with DBFPO-Pyr showed the best performance with maximum external quantum efficiency of 23.6%, current efficiency of 29.8 cd A?1, power efficiency of 26.0 lm W?1, and low efficiency roll-off of 6.38%. Novel hole blocking materials based on asymmetrically difunctionalized dibenzo[b,d]furan are expected to make a significant contribution to the development of blue phosphorescent OLEDs.
Aromatic phosphorus oxide compounds and preparation method for aromatic phosphorus oxide medicines of same
-
Paragraph 0063-0064, (2019/12/25)
The invention discloses a plurality of aromatic phosphorus oxide compounds and a preparation method of aromatic phosphorus oxide medicines of the same. The preparation method comprises the following steps: weighing 1.2 times equivalent of aromatic carboxy
Towards highly efficient blue-phosphorescent organic light-emitting diodes with low operating voltage and excellent efficiency stability
Han, Chunmiao,Xie, Guohua,Xu, Hui,Zhang, Zhensong,Yu, Donghui,Zhao, Yi,Yan, Pengfei,Deng, Zhaopeng,Li, Qiang,Liu, Shiyong
supporting information; experimental part, p. 445 - 449 (2011/03/18)
Let there be light! An effective strategy for the design of highly efficient phosphine oxide light-emitting-diode hosts with an ortho-linked structure has been demonstrated by synthesizing 4-diphenylphosphoryl dibenzofuran. The ortho linkage of the phosph
