The use of tetrabutylammonium, biflouride as stable and easily available source of flouride ion in nucleophilic substitution process with different substrates is reported.
Stereospecific Electrophilic Fluorination of Alkylcarbastannatrane Reagents
作者:Xinghua Ma、Mohamed Diane、Glenn Ralph、Christine Chen、Mark R. Biscoe
DOI:10.1002/anie.201704672
日期:2017.10.2
Speed matters: Site-specific fluorination reactions of isolable primary and secondary alkylcarbastannatrane nucleophiles occur fast, without the need for transition metal catalysis, or in situ activation of the nucleophile. The reaction conditions can also be extended to stereospecific chlorination, bromination, and iodination reactions.
functional group tolerant cobalt-catalyzed method for the intermolecular hydrofunctionalization of alkenes with oxygen- and nitrogen-based nucleophiles is reported. This protocol features a strategic use of hypervalent iodine(III) reagents that enables a mechanistic shift from conventional cobalt-hydride catalysis. Key evidence was found supporting a unique bimetallic-mediated rate-limiting step involving
Stable Dialkyl Ether/Poly(Hydrogen Fluoride) Complexes: Dimethyl Ether/Poly(Hydrogen Fluoride), A New, Convenient, and Effective Fluorinating Agent<sup>1</sup><sup>a</sup>
作者:Imre Bucsi、Béla Török、Alfonso Iza Marco、Golam Rasul、G. K. Surya Prakash、George A. Olah
DOI:10.1021/ja0124109
日期:2002.7.1
characterization as well as with DFT-based theoretical calculations of stable dialkyl ether/poly(hydrogenfluoride) complexes are reported. Dimethyl ether/poly(hydrogenfluoride) (DMEPHF), are stable complexes of particular interest and use. The DFT calculations, that are in agreement with NMR data, suggest a cyclic poly(hydrogenfluoride) bridged structure for DMEPHF. The complex, DME-5 HF was found to be a convenient
报道了稳定二烷基醚/聚(氟化氢)配合物的制备、1H、13C 和 19F NMR 结构表征以及基于 DFT 的理论计算。二甲醚/聚(氟化氢)(DMEPHF)是特别感兴趣和使用的稳定复合物。DFT 计算与 NMR 数据一致,表明 DMEPHF 具有环状聚(氟化氢)桥接结构。发现复合物 DME-5 HF 是一种方便有效的新型氟化剂,易于处理,可应用于多种氟化反应,例如烯烃的氢氟化和溴氟化,以及醇的氟化,收率高,收率高选择性。同源二烷基醚/聚(氟化氢) (R2O/[HF]n,, R = Et,
A Polycomponent Metal-Catalyzed Aliphatic, Allylic, and Benzylic Fluorination
A group effort: Reported is the title reaction using a polycomponent catalytic system involving commercially available Selectfluor, a putative radical precursor N‐hydroxyphthalimide, an anionic phase‐transfer catalyst (KB(C6F5)4), and a copper(I) bis(imine). The catalyst system formed leads to monofluorinated compounds selectively (see example) without the necessity for an excess of the alkane substrate
共同努力:报告为使用多组分催化体系的标题反应,涉及可商购的Selectfluor,推定的自由基前体N-羟基邻苯二甲酰亚胺,阴离子相转移催化剂(KB(C 6 F 5)4)和铜(I)二(亚胺)。形成的催化剂体系选择性地产生单氟化化合物(参见实施例),而无需过量的烷烃底物。