Copper catalyzed hydrodefluorination of propargylic gem-difluorides with “triple bonds migration”
作者:Ting Wang、Zhirong Li、Jiayi Hu、Tao Wu
DOI:10.1016/j.tet.2022.132897
日期:2022.8
A copper catalyzed hydrodefluorination of propargylic gem-difluorides was reported, in which two C–F bonds was reductive converted to C–H bonds and a new alkyne product was afforded with the triple bond migrating one methylene. Mechanistic studies show that the products are achieved by stepwise C–F bond reductive hydrogenation, and an allenyl monofluoride is proposed to be one of the active intermediates
Access to Chiral <i>O</i>,<i>O</i>‐Acetals Enabled by Palladium‐Catalyzed Asymmetric Addition of Oximes to Alkoxyallenes
作者:Zhuo‐Wei Xu、Shaozhong Wang
DOI:10.1002/chem.202301883
日期:2023.11.21
A palladium-catalyzed chemo-, regio- and stereoselective coupling of oximes and alkoxy allenes enables the access to enantiomerically pure O,O-acetals, in which the hydrogen bonding interaction between the amide group of the diphosphine ligand and the alkoxy allene is decisive for the high enantioselectivity.
钯催化的肟和烷氧基丙二烯的化学、区域和立体选择性偶联能够获得对映体纯的O , O -缩醛,其中二膦配体的酰胺基团和烷氧基丙二烯之间的氢键相互作用对于高对映选择性。
Benzylpropargylether as nitrification inhibitors
申请人:BASF SE
公开号:US11021413B2
公开(公告)日:2021-06-01
The present invention relates to the use of compounds of formula (I) for reducing nitrification and to compositions comprising the compounds of formula (I) and to agricultural mixtures comprising at least one compound of formula (I) and at least one fertilizer. Furthermore, the present invention relates to a method for reducing nitrification comprising treating a plant growing on soil or soil substituents and/or the locus or soil or soil substituents where the plant is growing or is intended to grow with a compound of formula (I) or a composition comprising a compound of formula (I).
Mercuric Triflate Catalyzed Hydroxylative Carbocyclization of 1,6-Enynes
作者:Mugio Nishizawa、Veejendra K. Yadav、Mariusz Skwarczynski、Hiroko Takao、Hiroshi Imagawa、Takumichi Sugihara
DOI:10.1021/ol034201u
日期:2003.5.1
[GRAPHICS]Hg(OTf)(2) exhibits remarkable catalytic activity for the hydroxylative cyclization of 1,6-enynes. The present procedure should involve a sequence of mercuration of a terminal alkyne, carbocyclization, hydration, and protodemercuration that regenerates the catalyst.