Oxidative C(sp<sup>3</sup>)–H bond cleavage, C–C and CC coupling at a boron center with O<sub>2</sub> as the oxidant mediated by platinum(<scp>ii</scp>)
作者:S. Pal、P. Y. Zavalij、A. N. Vedernikov
DOI:10.1039/c3cc47445c
日期:——
Platinum(ii) 1,5-cyclooctanediyldi(2-pyridyl)borates react with O2via C(sp3)–H bond cleavage and stepwise C–C and CC coupling of the borate ligand.
Vinyl Carbocations Generated under Basic Conditions and Their Intramolecular C–H Insertion Reactions
作者:Benjamin Wigman、Stasik Popov、Alex L. Bagdasarian、Brian Shao、Tyler R. Benton、Chloé G. Williams、Steven P. Fisher、Vincent Lavallo、K. N. Houk、Hosea M. Nelson
DOI:10.1021/jacs.9b02110
日期:2019.6.12
Here we report the surprising discovery that high-energy vinyl carbocations can be generated under strongly basicconditions, and that they engage in intramolecular sp3 C-H insertion reactions through the catalysis of weakly coordinating anion salts. This approach relies on the unconventional combination of lithium hexamethyldisilazide base and the commercially available catalyst, triphenylmethylium
Nickel Hydride Complexes Supported by a Pyrrole-Derived Phosphine Ligand
作者:Joel D. Collett、Jeanette A. Krause、Hairong Guan
DOI:10.1021/acs.organomet.1c00694
日期:2022.2.14
The synthesis of two nickel hydride complexes bearing the pyrrole-derived phosphine ligand CyPNH (2-(dicyclohexylphosphino)methyl-1H-pyrrole) was developed, namely, (κP-CyPNH)(κP,κN-CyPN)NiH and the acid-stable trans-(κP-CyPNH)2Ni(OAc)H·HOAc. (κP-CyPNH)(κP,κN-CyPN)NiH stoichiometrically reduces benzaldehyde and acetophenone in a metal–ligand cooperative manner and catalytically dimerizes ethylene and
开发了吡咯衍生膦配体Cy PN H (2-(dicyclohexylphosphino)methyl-1 H -pyrrole) 的两种氢化镍配合物的合成,即(κ P - Cy PN H )(κ P ,κ N - Cy PN)NiH 和酸稳定的反式-(κ P - Cy PN H ) 2 Ni(OAc)H·HOAc。(κ P - Cy PN H )(κ P ,κ N - CyPN)NiH 化学计量以金属配体协同的方式还原苯甲醛和苯乙酮,并催化乙烯二聚化和环异构化 1,5-环辛二烯和 1,5-己二烯。trans -(κ P - Cy PN H ) 2 Ni(OAc)H·HOAc,可从 (κ P - Cy PN H )(κ P ,κ N - Cy PN)NiH 用乙酸质子化得到,催化环化异构化1,5-环辛二烯的合成更有效,并产生热力学上不太有利的 1,5-环辛二烯的环状异构体。
Gold‐Mediated Isomerization of Cyclooctyne to Ring Fused Olefinic Bicycles
作者:Animesh Das、Yuanda Hua、Muhammed Yousufuddin、Thomas R. Cundari、Junha Jeon、H. V. Rasika Dias
DOI:10.1002/ejic.201600021
日期:2016.3
Isomerization reactions of cyclooctyne mediated by N-heterocyclic carbene supported gold(I) leading to ring-contraction and the formation of 5/5-fused bicyclic alkenes have been observed. Isolation and complete characterization, including X-ray structural data of the cationic gold(I) complexes featuring the precursor alkyne and the product alkenes are also described.
已经观察到由 N-杂环卡宾负载的金 (I) 介导的环辛炔异构化反应导致环收缩和 5/5 稠合双环烯烃的形成。还描述了以前体炔烃和产物烯烃为特征的阳离子金 (I) 配合物的分离和完整表征,包括 X 射线结构数据。
Sulfur-bridged carbocycles. II. Extrusion of the sulfur bridge