palladium-catalyzed three-component cascade reaction has been developed for the facile construction of phenanthrene frameworks. The transformation is driven by a controlled reaction sequence of Suzuki–Miyaura coupling followed by the insertion of alkynes, and finally, annulation to yield phenanthrene derivatives via C–H activation. This methodology is able to accommodate a variety of substrates and affords
was prepared, and their structures and dynamic behaviors were both theoretically and experimentally investigated. A more twisted and crowded phenanthrene backbone was associated with a lower barrier to the rotation of an aryl group.
LAI YEE-HING, J. CHEM. SOC. PERKIN TRANS.,(1986) N 11, 1667-1670
作者:LAI YEE-HING
DOI:——
日期:——
LAI, YEE-HING;LEE, SIOK-MUN, J. ORG. CHEM., 53,(1988) N 19, C. 4472-4476
作者:LAI, YEE-HING、LEE, SIOK-MUN
DOI:——
日期:——
Conformational studies of 9,10-ditolylphenanthrenes: high rotational barriers for the syn–anti interconversion
作者:Yee-Hing Lai
DOI:10.1039/p29860001667
日期:——
recrystallization. The chemical shifts for the methyl protons of isomers of the latter are almost identical in most solvents but they are clearly resolved in nitrobenzene. Conformational studies have revealed exceptionally high barriers to rotation (ΔG‡ > 155 kJ mol–1) for the aryl rings in 9,10-di-o-tolyphenanthrene. At room temperature, restricted free rotation of the aryl rings was also observed in
已经合成了9,10- di - o-和9,10- di - m-甲苯基菲。所述的存在顺式和反前者的异构体是显而易见的1个H NMR数据和所述异构体之一通过分级重结晶得到纯的。后者的异构体的甲基质子的化学位移在大多数溶剂中几乎相同,但是清楚地在硝基苯中得到解析。构象研究表明,9,10-二邻甲苯基菲中的芳基环具有极高的旋转壁垒(ΔG ‡ > 155 kJ mol –1)。在室温下,在9,10-di-米-tolylphenanthrene(Δ ģ č ‡ 85千焦耳摩尔-1)。