Results 51 to 60 of about 45,374 (213)

Catalytic, Z-Selective, Semi-Hydrogenation of Alkynes with a Zinc–Anilide Complex [PDF]

, 2022
The reversible activation of dihydrogen with a molecular zinc anilide complex is reported. The mechanism of this reaction has been probed through stoichiometric experiments and DFT calculations. The combined evidence suggests that H2 activation occurs by
Mark, Crimmin, Andrew , White, Ian, Casely, Damian, Grainger, Greg, Baker   +4 more
core   +2 more sources

Electrophilic Additions of Positive Iodine to Alkynes through an Iodonium Mechanism [PDF]

, 1990
Alkynes react with bis(pyridine)iodonium(I) tetrafluoroborate (1) and nucleophiles (CH3COOH, HCOOH, Cl-, pyridine, Br-, I-) to give 1,2-iodofunctionalized alkenes.
Barluenga, J., Rodríguez, M.A., Campos, P.J.   +2 more
core   +1 more source

Hydroboration of Terminal Alkynes Catalyzed by a Mn(I) Alkyl PCP Pincer Complex following Two Diverging Pathways [PDF]

A stereo- and regioselective Mn(I)-catalyzed hydroboration of terminal alkynes with pinacolborane (HBPin) is described. The hydroboration reaction is highly Z-selective in the case of aryl alkynes and E-selective in the case of aliphatic alkynes.
Karl, Kirchner, Berthold, Stoeger, Daniel, Zobernig, Luis, Veiros   +3 more
core   +2 more sources

Hydrostannation of Alkynes [PDF]

, 2019
International audienceIn this review, we present an overview of hydrostannation of alkynes until the end of 2018. Mechanism of the tin hydride addition on a triple bond is discussed at the beginning of this review in the presence of metal catalysts as Pd,
Alami, Mouad, Provot, Olivier, Hamze, Abdallah   +2 more
core   +1 more source

Gold- and Iodine-Mediated Internal Oxygen Transfer of Nitrone- and Sulfoxide-Functionalized Alkynes

, 2011
Gold- and Iodine-Mediated Internal Oxygen Transfer of Nitrone- and Sulfoxide-Functionalized AlkynesIntramolecular oxygen transfer of nitrone- and sulfoxide-alkynes was achieved using a catalytic amount of Au(I) and a stoichiometric amount of iodine.
AiqunJia, 李兴伟, Song, Guoyong, Chen, Dan, Jia, Aiqun, Li, Xingwei   +5 more
core   +1 more source

Cascade CuH-Catalyzed Conversion of Alkynes to Enantioenriched 1,1-Disubstituted Products [PDF]

, 2019
Enantioenriched α-aminoboronic acids play a unique role in medicinal chemistry and have emerged as privileged pharmacophores in proteasome inhibitors. Additionally, they represent synthetically useful chiral building blocks in organic synthesis. Recently,
Tian-Zhang, Qiao, Peng, Liu, Xin, Wang, De-Wei, Gao, Yang, Gao, Jason, Chen, Brittany, Sanchez, Keary, Engle, Huiling, Shao   +8 more
core   +2 more sources

Rhodium(III)-Catalyzed Oxidative Coupling of 5-Aryl-1H-pyrazoles with Alkynes and Acrylates

, 2011
Rhodium(III)-Catalyzed Oxidative Coupling of 5-Aryl-1H-pyrazoles with Alkynes and Acrylates[RhCp*Cl(2)](2)-catalyzed oxidative coupling of 5-aryl-1H-pyrazoles with alkynes and acrylates has been achieved using Cu(OAc)(2) as an oxidant.
李兴伟, Zhao, Miao, Li, Xingwei
core   +1 more source

1,3-Butadiynamides the Ethynylogous Ynamides: Synthesis, Properties and Applications in Heterocyclic Chemistry

Molecules, 2023
1,3-butadiynamides—the ethynylogous variants of ynamides—receive considerable attention as precursors of complex molecular scaffolds for organic and heterocyclic chemistry.
Illia Lenko, Carole Alayrac, Igor Bożek, Bernhard Witulski   +3 more
doaj   +1 more source

Recent advances in transition-metal-catalyzed intermolecular carbomagnesiation and carbozincation

Beilstein Journal of Organic Chemistry, 2013
Carbomagnesiation and carbozincation reactions are efficient and direct routes to prepare complex and stereodefined organomagnesium and organozinc reagents.
Kei Murakami, Hideki Yorimitsu
doaj   +1 more source

E‐Selective Radical Difunctionalization of Unactivated Alkynes: Preparation of Functionalized Allyl Alcohols from Aliphatic Alkynes

Advanced Science
Radical difunctionalization of aliphatic alkynes provides direct access to valuable multi‐substituted alkenes, but achieving a high level of chemo‐ and stereo‐control remains a formidable challenge.
Jie Wang, Xinxin Wu, Zhu Cao, Xu Zhang, Xinxin Wang, Jie Li, Chen Zhu   +6 more
doaj   +1 more source