Photoredox-catalyzed deoxyfluorination of activated alcohols with Selectfluor®
作者:María González-Esguevillas、Javier Miró、Jenna L. Jeffrey、David W.C. MacMillan
DOI:10.1016/j.tet.2019.05.043
日期:2019.8
Herein we disclose a deoxyfluorination of alcohols with an electrophilic fluorine source via visible-light photoredox catalysis. This radical-mediated C–F coupling is capable of fluorinating secondary and tertiary alcohols efficiently, complementing previously reported nucleophilic deoxyfluorination protocols.
1,1,2,2-Tetrafluoroethyl-N,N-dimethylamine: a new selective fluorinating agent
作者:Viacheslav A. Petrov、Steve Swearingen、Wonpyo Hong、W. Chris Petersen
DOI:10.1016/s0022-1139(01)00372-4
日期:2001.6
The title compound has been prepared in 96–98% yield by the reaction of tetrafluoroethylene and dimethylamine. 1,1,2,2-Tetrafluoroethyl-N,N-dimethylamine (1) is found to be an effective reagent for the conversion of alcohols into alkyl fluorides. Reaction of 1 and primary alcohols proceeds with high yield formation of the corresponding alkyl fluorides at elevated temperature. However, the reaction
The Uranyl Cation as a Visible‐Light Photocatalyst for C(sp
<sup>3</sup>
)−H Fluorination
作者:Julian G. West、T. Aaron Bedell、Erik J. Sorensen
DOI:10.1002/anie.201603149
日期:2016.7.25
transformation have used bench‐stable fluorine atom sources; however, many still rely on the use of UV‐active photocatalysts for the requisite high‐energy hydrogenatomabstraction event. Uranyl nitrate hexahydrate is described as a convenient, hydrogenatomabstraction catalyst that can mediate fluorinations of certain alkanes upon activation with visiblelight.
Method for producing organic compounds by substituting halogen atoms
申请人:MITSUI CHEMICALS, INC.
公开号:EP1486479A1
公开(公告)日:2004-12-15
The invention pertains to a method in which a halogen atom of an organic compound is replaced with a group derived from a nucleophilic agent, at high yield and high efficiency, by the following method which includes a step of reacting the nucleophilic agent with an organic material having a halogen atom bonded to a carbon atom having four σ bonds, more specifically: a method for producing an organic compound having Q, the method including a step of reacting a compound represented by general formula (2) with an organic starting material having at least one halogen atom bonded to a carbon atom having four σ bonds so as to replace the halogen atom in the organic starting material with Q:
MQa (2)
(wherein M represents an alkali metal atom, an alkali earth metal atom, or a rare earth metal atom; Q represents a moiety of an inorganic acid or an active hydrogen compound derived by eliminating a proton, wherein Q is a halogen atom different from the halogen atom in the organic starting material having the halogen atom bonded to the carbon atom having the four σ bonds; and a represents an integer of 1 to 3) in the presence of a compound represented by general formula (1)
(wherein Z- represents an anion derived by eliminating a proton from an inorganic acid or an active hydrogen compound; R2 is the same or different; R2 each independently represent a C1-C10 hydrocarbon group or two R2 on the same nitrogen atom may be bonded with each other to form a ring with the nitrogen atom).
Stabilization of Photocatalytically Active Uranyl Species in a Uranyl–Organic Framework for Heterogeneous Alkane Fluorination Driven by Visible Light
作者:Xuan Zhang、Peng Li、Matthew Krzyaniak、Julia Knapp、Michael R. Wasielewski、Omar K. Farha
DOI:10.1021/acs.inorgchem.0c00850
日期:2020.12.7
When photoactivated, the uranyl ion is a powerful oxidant capable of abstracting hydrogenatoms from nonactivated C–H bonds. However, the highly reactive singly reduced [UVO2]+ intermediate is unstable with respect to disproportionation to the uranyl dication and insoluble tetravalent uranium phases, which limits the usage of uranyl ions as robust photocatalysts. Herein, we demonstrate that photoactivated
当被光活化时,铀酰离子是一种强大的氧化剂,能够从未活化的C–H键中提取氢原子。但是,高反应性会单独还原[U V O 2 ] +中间体在关于铀酰指示剂和不溶性四价铀相的歧化方面是不稳定的,这限制了将铀酰离子用作坚固的光催化剂。在这里,我们证明光活化的铀酰离子可以通过在铀酰-有机骨架非均相催化剂NU-1301中固定和分离它们而稳定。X射线光电子能谱和随时间变化的电子顺磁共振表明,NU-1301中可见光激活的铀酰离子比同质对应物具有更长寿命的U(V)和自由基。非活化烷烃氟化的稳定性。