Selective and Efficient Cycloisomerization of Alkynols Catalyzed by a New Ruthenium Complex with a Tetradentate Nitrogen-Phosphorus Mixed Ligand
作者:Pei Nian Liu、Fu Hai Su、Ting Bin Wen、Herman H.-Y. Sung、Ian D. Williams、Guochen Jia
DOI:10.1002/chem.200903441
日期:——
The new ruthenium complex [Ru(N3P)(OAc)][BPh4] (4), in which N3P is the N,P mixed tetradentate ligand N,N‐bis[(pyridin‐2‐yl)methyl]‐[2‐(diphenylphosphino)phenyl]methanamine was synthesized. The complex was found to be catalytically active for the endo cycloisomerization of alkynols. The catalytic reactions can be used to synthesize five‐, six‐, and seven‐membered endo‐cyclic enol ethers in good to
Visible‐Light‐Promoted Ring‐Opening Alkynylation, Alkenylation, and Allylation of Cyclic Hemiacetals through β‐Scission of Alkoxy Radicals
作者:Jiang‐Ling Shi、Zixuan Wang、Rui Zhang、Yuankai Wang、Jianbo Wang
DOI:10.1002/chem.201901762
日期:2019.7.5
The alkoxy radicals that are derived fromcyclic hemiacetals have been generated through the visible‐light‐promoted reaction of the corresponding N‐alkoxyphthalimides with Hantzsch ester as the reductant. The alkoxy radicals subsequently undergo β‐scission of the C−C bond to generate carbon‐centered radicals, which are trapped by alkynyl‐, alkenyl‐, or allylsulfones.
The formation of peroxides from vinyl ethers in the presence of silica-gel
作者:F Kovač
DOI:10.1016/s0040-4039(01)00968-6
日期:2001.7
Silica-gel containing H2O2 or ROOH transforms vinyl alkyl or vinyl aryl ethers into the corresponding α-alkoxy hydroperoxides and dialkyl peroxides under very mild reaction conditions.
含有H 2 O 2或ROOH的硅胶在非常温和的反应条件下将乙烯基烷基或乙烯基芳基醚转化为相应的α-烷氧基氢过氧化物和二烷基过氧化物。
Alkyne Hydrofunctionalization Mechanism Including an Off-Cycle Alkoxycarbene Deactivation Complex
作者:Devon E. Chapple、Megan A. Hoffer、Paul D. Boyle、Johanna M. Blacquiere
DOI:10.1021/acs.organomet.2c00170
日期:2022.6.27
the supporting ligand effectively mediated proton-transfer steps and mitigated a vinyl ammonium deactivation pathway that was previously favored with a more nucleophilic N-benzyl substituent. A select set of substrates were cyclized to uncover mechanistic opportunities and limitations of Ru2 and related catalysts. Isotopic labeling and kinetic studies, using the variable time normalization analysis