Well-defined palladium(0) complexes bearing N-heterocyclic carbene and phosphine moieties: efficient catalytic applications in the Mizoroki–Heck reaction and direct C–H functionalization
作者:Jhen-Yi Lee、Jiun-Shian Shen、Ru-Jiun Tzeng、I-Chen Lu、Jenn-Huei Lii、Ching-Han Hu、Hon Man Lee
DOI:10.1039/c6dt01323f
日期:——
Two series of well-defined palladium(0) complexes with phosphine-functionalized N-heterocyclic carbene ligands were prepared. These complexesfeatured six- and seven-membered chelate rings in the two series. Among the seven-membered chelate complexes, those featuring the PCy2 moiety exhibited observable fluxional behavior on the NMR time scale, corresponding to the interchange between two sets of conformations
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
Stereoselective Photodimerization of (<i>E</i>)-Stilbenes in Crystalline γ-Cyclodextrin Inclusion Complexes
作者:K. S. S. P. Rao、S. M. Hubig、J. N. Moorthy、J. K. Kochi
DOI:10.1021/jo9903149
日期:1999.10.1
Solid-state irradiation of the crystallineinclusioncomplex of (E)-stilbene in gamma-cyclodextrin (gamma-CD) yields a single isomer of syn-tetraphenylcyclobutane stereoselectively in high yield. In contrast, the photodimerization of stilbene in solution is very inefficient and unselective, and no photodimer is observed even upon prolonged irradiation of pure crystals. The monosubstituted stilbenes