Pyrene‐Tagged Alcoholic Ionic Liquids as Phase Transfer Catalysts for Nucleophilic Fluorination
作者:Abu Taher、Dong Wook Kim
DOI:10.1002/bkcs.12123
日期:2020.12
Functional group−activity relationships of pyrene‐tagged ionicliquid (PTIL)‐based organocatalysts for nucleophilic fluorination using alkali metal fluorides (MFs) are described, which demonstrate that the pyrene, oligoether and alcohol moieties on the imidazolium ring are vital for efficient catalysis. Further investigation of these findings led to the discovery of new strategy, which showed superior
描述了of标记的离子液体(PTIL)基有机催化剂用于使用碱金属氟化物(MF)进行亲核氟化的官能团活性关系,这表明咪唑环上的pyr,寡醚和醇部分对于有效催化至关重要。对这些发现的进一步研究导致了新策略的发现,该策略显示了卓越的催化剂分离工艺,即使用还原性氧化石墨烯可轻松地从反应混合物中分离出催化剂。PTIL作为相转移催化剂的催化效率通过使用CH 3 CN或t中的MF进行反应物的高转化率(高达98%的氟化产率)得到证明。戊醇。重要的是,该催化剂不仅可以在较短的反应时间内提高双分子亲核取代基(S N 2)的反应性,减少副产物的形成,而且在温和条件下易于分离和分离,可提供高收率。
Pyrene-Tagged Ionic Liquids: Separable Organic Catalysts for S<sub>N</sub>2 Fluorination
作者:Abu Taher、Kyo Chul Lee、Hye Ji Han、Dong Wook Kim
DOI:10.1021/acs.orglett.7b01064
日期:2017.7.7
as organic catalysts for the SN2 fluorination using alkalimetalfluoride (MF). In this system, the PIL significantly enhanced the reactivity of MF due to the phase-transfer catalytic effect of the imidazolium moiety as well as the metal cation−π (pyrene) interactions. Furthermore, this homogeneous catalyst PIL was easily separated from the reaction mixture using reduced graphene oxide by π–π stacking
我们制备了pyr取代的咪唑基离子液体(PIL),作为使用碱金属氟化物(MF)进行S N 2氟化的有机催化剂。在该系统中,由于咪唑部分的相转移催化作用以及金属阳离子-π(py)相互作用,PIL显着提高了MF的反应性。此外,这种均相催化剂PIL易于通过还原石墨烯氧化物与PIL的π-π堆积而从反应混合物中分离出来。
Crosslinkable proppant particulates for use in subterranean formation operations
申请人:Halliburton Energy Services, Inc.
公开号:US10066152B2
公开(公告)日:2018-09-04
Methods including preparing a treatment fluid comprising an aqueous base fluid, a gelling agent, and crosslinkable proppant particulates comprising proppant particulates having covalently grafted thereon a boronic acid functional group; crosslinking the crosslinkable proppant particulates with the gelling agent, thereby suspending the crosslinkable proppant particulates in the treatment fluid; introducing the treatment fluid into a subterranean formation having at least one fracture therein; and placing the crosslinkable proppant particulates into the at least one fracture to form a proppant pack therein.
Direct Functionalization of Arenes by Primary Alcohol Sulfonate Esters Catalyzed by Gold(III)
作者:Zhangjie Shi、Chuan He
DOI:10.1021/ja046890q
日期:2004.10.1
Alkylation of arenes by primary alcohol triflate or methanesulfonate esters can be efficiently catalyzed by AuCl3 with silver triflate.
Synthesis of Poly(1,4-Phenylenevinylene) Derivatives Containing NLO Chromophore within Side Chains
作者:Ki-Jeong Moon、Kwang-Sup Lee、Hong-Ku Shim
DOI:10.1080/10587259608040307
日期:1996.4
Poly(1,4-phenylenevinylene) derivative, 58-poly(NO2STMPV-co-IMPV), consisting of poly[2-methoxy-5-3-(4-nitrostilben-4'-yl-oxy)propoxy}phenylenevinylene] (poly(NO2STMPV)) and poly(2-isopropoxy-5-methoxy-1,4-phenylenevinylene) (poly(IMPV)) was synthesized through the Wessling's precursor method. Films of the precursor copolymers were eliminated either by way of thermal treatment or using strong acidic conditions. The electrical conductivities of FeCl3-doped 58-poly(NO2STMPV-co-IMPV) were found to be between 10(-1)-10(-4) S/cm. The second-order nonlinear optical susceptibility (d(33)) of this copolymer was about 2.0 pm/V.