89346-58-7Relevant articles and documents
Synthesis of highly substituted fluorenones via metal-free TBHP-promoted oxidative cyclization of 2-(aminomethyl)biphenyls. Application to the total synthesis of nobilone
Bracher, Franz,Jourjine, Ilya A. P.,Krau?, Jürgen,Zeisel, Lukas
supporting information, p. 2668 - 2679 (2021/11/30)
Highly substituted fluorenones are readily prepared in mostly fair to good yields via metal- and additive-free TBHP-promoted cross-dehydrogenative coupling (CDC) of readily accessible N-methyl-2-(aminomethyl)biphenyls and 2-(aminomethyl)biphenyls. This methodology is compatible with numerous functional groups (methoxy, cyano, nitro, chloro, and SEM and TBS-protective groups for phenols) and was further utilized in the first total synthesis of the natural product nobilone.
High-performance sky-blue phosphorescent organic light-emitting diodes employing wide-bandgap bipolar host materials with thermally activated delayed fluorescence characteristics
Zhang, Yuan-Lan,Ran, Quan,Wang, Qiang,Tian, Qi-Sheng,Kong, Fan-Cheng,Fan, Jian,Liao, Liang-Sheng
, (2020/03/03)
Up to date, several kinds of thermally activated delayed fluorescence (TADF) host molecules have been rapidly developed to fulfill the increasing demand of high-efficiency phosphorescent organic light-emitting diodes (PHOLEDs). Herein, three wide-bandgap TADF materials BPCN-Cz2Ph, BPCN-2Cz, and BPCN-3Cz are newly designed and synthesized as host materials for sky-blue PHOLEDs. By modulation of carbazole-units in the molecular skeleton, we find that the optimized molecules can realize both high triplet energies and balanced carrier transport properties with obvious TADF properties. The sky-blue PHOLEDs with ultralow phosphor doping ratio employing BPCN-Cz2Ph, BPCN-2Cz, and BPCN-3Cz as host materials demonstrate really high performance with alleviated roll-offs and achieve impressive current efficiencies (CEs) of 46.5 cd A?1, 50.0 cd A?1, and 34.5 cd A?1, power efficiencies (PEs) of 40.6 lm W?1, 46.8 lm W?1, and 34.8 lm W?1, and external quantum efficiencies (EQEs) of 22.2%, 24%, and 15.8%, respectively. More encouragingly, even at an applied luminance of 1000 cd m?2, the EQEs could maintain high levels of 21.0%, 21.5% and 12.8%, respectively, which represents the potential utility value of the new family of these molecules in blue PHOLEDs. Our molecular design strategy provides a practical way to construct promising wide-bandgap TADF host materials with an excellent combination of TADF property, high triplet energy, and balanced carrier-transporting ability for high-performance devices.
Process for synthesizing boscalid
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Paragraph 0061-0064, (2019/05/02)
The invention discloses a process for synthesizing boscalid. The process comprises the following steps: (1) coupling o-chlorobenzonitrile with benzene to obtain 2-cyanobiphenyl, then carrying out chlorination, reduction and salt formation purification to obtain 4'-chloro-2-aminobiphenyl hydrochloride; (2) carrying out condensation reaction on the prepared 4'-chloro-2-aminobiphenyl hydrochloride and 2-chloronicotinoyl chloride to obtain the boscalid. The process for synthesizing the boscalid has the advantages of simple synthesis process, no need of complex aftertreatment, cheap and easily available basic chemical raw materials, and suitability for industrial production.
