A series of N,N′-mono substituted acyclic thiourea ligands are found to be highly active phosphine-free catalysts for palladium catalyzed Heck reaction of aryl iodides and bromides with olefins. We have achieved high turnover numbers for aryl iodides with olefins (TONs up to 970,000 for the reaction of iodobenzene with styrene).
Highly Efficient Fluorine-Promoted Intramolecular Condensation of Benzo[<i>c</i>]phenanthrene: A New Prospective on Direct Fullerene Synthesis
作者:Konstantin Yu. Amsharov、Mikhail A. Kabdulov、Martin Jansen
DOI:10.1002/ejoc.200900976
日期:2009.12
intramolecular condensation of benzo[c]phenanthrene under flash vacuum pyrolysis conditions. Methyl and fluorine functionalization were found to be promising approaches. Unexpectedly high selectivity was observed in the cyclization of fluorinated benzo[c]phenanthrenes. The mechanism for the condensation reaction and the advantages of fluorine as a promoter for the rational synthesis of fullerenes are discussed
Practical Cross-Coupling between O-Based Electrophiles and Aryl Bromides via Ni Catalysis
作者:Zhi-Chao Cao、Qin-Yu Luo、Zhang-Jie Shi
DOI:10.1021/acs.orglett.6b02656
日期:2016.12.2
Cross-coupling of various O-based electrophiles with aryl bromides was developed through Ni-catalyzed C–O activation in the presence of magnesium. Beside carboxylates, carbamates, and ethers, phenols exhibited excellent reactivity under modified conditions. This chemistry was featured as a simple and environmentally benign process with low catalyst loading and easy manipulations. The method exhibited
Absolute asymmetric synthesis. I. Mechanism of the photochemical synthesis of nonracemic helicenes with circularly polarized light. Wavelength dependence of the optical yield of octahelicene
作者:William J. Bernstein、Melvin Calvin、Ole Buchardt