irradiation has been shown to have a beneficial effect on catalyst preparation. The catalyst exhibited excellent activity in ligand‐free C−C Suzuki and Heck couplings with a large number of aryl iodide and bromides, in which microwave irradiation use cuts down reaction time. Pd/Si‐CD have shown high activity and selectivity in the hydrogenationreaction, and the semihydrogenation of phenyl acetylene was also
Studies in photochemistry. Part VII. The photocyclisation of some nuclear-substituted stilbenes to substituted phenanthrenes
作者:E. V. Blackburn、C. E. Loader、C. J. Timmons
DOI:10.1039/j39680001576
日期:——
Photocyclodehydrogenation of trans-9-styryl-1,2,3,4,5,6,7,8-octahydroanthracene in cyclohexane solution formed a mixture of 11-butyl- and 11-but-3-enyl-1,2,3,4-tetrahydrochrysene in very small yield, identified by their i.r., u.v., 1H n.m.r., and mass spectra. 2,4,6-Trimethylstilbene photocyclised to 1,3-dimethylphenanthrene with the elimination of a methyl group. 3,3′,5,5′-Tetramethylstilbene formed
在环己烷溶液中反式-9-苯乙烯基-1,2,3,4,5,6,7,8-八氢蒽的光环脱氢反应形成11-丁基-和11-丁-3-烯基-1,2,3的混合物通过其ir,uv,1 H nmr和质谱鉴定的1,4-四氢丙烯收率非常低。2,4,6-三甲基sti光环化为1,3-二甲基菲并消除了甲基。当在环己烷溶液中照射时,3,3',5,5'-四甲基sti形成了2,4,5,7-四甲基菲。类似地,4,4′-二溴-和4,4′-二氰基-sti形成相应的3,6-二取代的菲。
Straightforward synthesis of phenanthrenes from styrenes and arenes
作者:Hu Li、Ke-Han He、Jia Liu、Bi-Qin Wang、Ke-Qing Zhao、Ping Hu、Zhang-Jie Shi
DOI:10.1039/c2cc33100d
日期:——
Semi-one-pot synthesis of phenanthrenesfrom styrenes and arenes was developed through cross-dehydrogenative coupling. A sequence of Heck-type coupling and photo-cyclization were involved and a variety of functionalities were tolerated. This method provides an effective and practical protocol towards the synthesis of substituted phenanthrenes.
Synthesis of Stilbenes by Rhodium-Catalyzed Aerobic Alkenylation of Arenes via C–H Activation
作者:Xiaofan Jia、Lucas I. Frye、Weihao Zhu、Shunyan Gu、T. Brent Gunnoe
DOI:10.1021/jacs.0c03935
日期:2020.6.10
Arenealkenylation is commonly achieved by late transition metal-mediated C(sp2)-C(sp2) cross-coupling, but this strategy typically requires prefunctionalized substrates (e.g., with halides or pseudohalides) and/or the presence of a directing group on the arene. Transition metal-mediated areneC-Hactivation and alkenylation offers an alternative method to functionalize arene substrates. Herein, we
[EN] METHODS OF ARENE ALKENYLATION<br/>[FR] PROCÉDÉS D'ALCÉNYLATION D'ARÈNE
申请人:UNIV VIRGINIA PATENT FOUNDATION
公开号:WO2021236764A1
公开(公告)日:2021-11-25
The present disclosure provides for a rhodium-catalyzed oxidative arene alkenylation from arenes and styrenes to prepare stilbene and stilbene derivatives. For example, the present disclosure provides for method of making arenes or substituted arenes, in particular stilbene and stilbene derivatives, from a reaction of an optionally substituted arene and/or optionally substituted styrene. The reaction includes a Rh catalyst or Rh pre-catalyst material and an oxidant, where the Rh catalyst or Rh catalyst formed Rh pre-catalyst material selectively functionalizes CH bond on the arene compound (e.g., benzene or substituted benzene).