作者:Zhongtao Feng、Yuanyuan Chong、Shuxuan Tang、Huapeng Ruan、Yong Fang、Yue Zhao、Jun Jiang、Xinping Wang
DOI:10.1002/cjoc.202100188
日期:2021.5
to make new category of stable luminescent radicals with desired emission wavelength. In this study, we have isolated two dioxoborocyclic radicals (3 and 4) by a direct synthetic route. They were characterized by UV, EPR spectroscopy and SQUID measurements. Their structures were obtained by single‐crystalX‐ray diffraction. Both radicals produce blue‐photoluminescence (458 nm for 3 and 478 nm for 4)
迫切需要开发合成策略以制备具有所需发射波长的新型稳定发光基团。在这项研究中,我们通过直接合成途径分离了两个二氧杂硼环自由基(3和4)。通过紫外线,EPR光谱和SQUID测量对它们进行了表征。它们的结构是通过单晶X射线衍射获得的。根据理论计算,两个自由基都通过从高激发态(D 2 / D 3)到基态(D 0)的辐射衰减而产生蓝色光致发光(3 458 nm,4 478 nm),这打破了卡沙法则。该作品记录了一种新型的自由基发射体和带有蓝色发射带的第一个稳定自由基。
Synthesis of Highly Functionalized 9,10-Phenanthrenequinones by Oxidative Coupling Using MoCl<sub>5</sub>
作者:Simon Trosien、Siegfried R. Waldvogel
DOI:10.1021/ol300948u
日期:2012.6.15
The strong oxidative power of molybdenum pentachloride gives rise to an efficient oxidative C-C bond formation of benzil derivatives to the corresponding 9,10-phenanthrenequinones. A highly complementary method to previous approaches was developed. The required derivatives are accessible in a modular fashion and in excellent yields. By this approach the orchid-derived natural product cypripediquinone A was synthesized for the first time.
Synthesis of alkyl- and alkoxy-substituted benzils and oxidative coupling to tetraalkoxyphenanthrene-9,10-diones
作者:Bernhard Mohr、Volker Enkelmann、Gerhard Wegner
DOI:10.1021/jo00082a022
日期:1994.2
Intermolecular Friedel-Crafts acylation of various substituted alkyl- or alkoxybenzenes with oxalyl chloride using carbon disulfide as solvent gave rise to the benzils 1a-k. Subsequent intramolecular oxidative coupling with either thallium(III) oxide/trifluoroacetic acid or vanadium(V) oxyfluoride/boron trifluoride diethyl etherate resulted in the corresponding phenanthrene-9,10-diones 2a-d. It has been shown that oxygen functionalities at the 3, 3', 4, and 4' positions are necessary for coupling to occur. These substituted benzils and phenanthrene-9,10-diones constitute precursors for ligands in the field of discotic metallomesogens or polymeric mesogens.
Brass; Stroebel, Chemische Berichte, 1930, vol. 63, p. 2617,2618