Efficient Synthesis of Unsymmetrical Dibenzothiophenes by Acid-Mediated Intramolecular Cyclization of Biaryl Methyl Sulfoxides
摘要:
A convenient and high-yielding synthesis of unsymmetrical dibenzothiophenes has been achieved by an acid-mediated ring closure of the biphenyl ring having a sulfoxide substituent at the ortho position. Various functional groups are well tolerated in this methodology.
Experimental and Computational Studies on the Directing Ability of Chalcogenoethers in Palladium‐Catalyzed Atroposelective C−H Olefination and Allylation
作者:Gang Liao、Tao Zhang、Liang Jin、Bing‐Jie Wang、Cheng‐Kai Xu、Yu Lan、Yu Zhao、Bing‐Feng Shi
DOI:10.1002/anie.202115221
日期:2022.3
of chalcogenoether motifs in Pd-catalyzed atroposelective C−Holefination and allylation are presented. The thioether motif was found to be a superior directing group compared to the corresponding ether (−OR) and selenoether in terms of reactivity and enantiocontrol. The selenoether unit (−SeMe) was used for the first time as a suitable directing group in asymmetric C−H activation.
Dibenzothiophenes and related compounds. III. Reactions of 10-substituted 9,9-dimethylthioxanthenium and 5-substituted dibenzothiophenium salts with organolithiums.
In order to elucidate the mechanism of the ligand-exchange reaction between sulfonium salt and organolithium, the reactions of organolithiums with 10-substituted 9, 9-dimethylthioxanthenium salts and dibenzothiophenium salts having a bulky group at 5-position have been carried out to get the results, as shown in Tables I and II. It has been proposed that the SN2 type mechanism is valid for the ligand exchange in the reactions described above.
为了阐明锍盐与有机锂之间配体交换反应的机理,我们进行了有机锂与 10-取代的 9,9-二甲基硫代噻吩盐和 5-位有稠合基团的二苯并噻吩盐的反应,结果如表 I 和表 II 所示。有人提出,SN2 型机理适用于上述反应中的配体交换。
Dibenzothiophenes and related compounds. V. Reactions of 5-substituted dibenzothiophenium salts with organometallic reagents.
In order to compare the mechanisms of reactions of sulfonium salts with organolithiums and Grignard reagents, the reactions between 5-substituted dibenzothiophenium salts and methyllithium, methylmagnesium halides, and phenylmagnesium halides have been investigated to get a large difference as shown in Tables I and II, respectively. The reactions of 5-substituted dibenzothiophenium salts with methyllithium gave ring-opening products (I) as main products in Table I, whereas the reactions of those with methylmagnesium iodide gave no I or only little. Instead, these reactions gave ringopening products (III) as main products in Table II. The mechanisms of the formation of the products of the runs in Table I and II have been explained as shown in Chart 2 and Chart 4, respectively.
为了比较锍盐与有机锂和格氏试剂的反应机理,研究了 5-取代二苯并噻吩盐与甲基锂、甲基卤化镁和苯基卤化镁的反应,结果差异很大,分别如表 I 和表 II 所示。在表 I 中,5-取代二苯并噻吩盐与甲基锂的反应以开环产物(I)为主要产物,而与甲基碘化镁的反应则没有或只有少量的开环产物(I)。相反,这些反应产生的开环产物(III)是表 II 中的主要产物。表 I 和表 II 中运行产物的形成机理分别如图 2 和图 4 所示。
ORGANIC ELECTROLUMINESCENT MATERIALS AND DEVICES
申请人:Universal Display Corporation
公开号:EP3091024A1
公开(公告)日:2016-11-09
Imidazophenanthridine ligands and metal complexes are provided. The compounds exhibit improved stability through a linking substitution that links a nitrogen bonded carbon of an imidizole ring to a carbon on the adjacent fused aryl ring. The compounds may be used in organic light emitting devices, particularly as emissive dopants, providing devices with improved efficiency, stability, and manufacturing. In particular, the compounds provided herein may be used in blue devices having high efficiency.
ORGANIC ELECTROLUMINESCENCE DEVICE AND DIAMINE COMPOUND FOR ORGANIC ELECTROLUMINESCENCE DEVICE
申请人:Samsung Display Co., Ltd.
公开号:EP3828161A2
公开(公告)日:2021-06-02
An organic electroluminescence device of an embodiment includes a first electrode, a hole transport region disposed on the first electrode, an emission layer disposed on the hole transport region, an electron transport region disposed on the emission layer, and a second electrode disposed on the electron transport region, wherein the hole transport region includes a diamine compound represented by Formula 1, thereby showing high emission efficiency: