Aluminum Hydroxide Secondary Building Units in a Metal–Organic Framework Support Earth-Abundant Metal Catalysts for Broad-Scope Organic Transformations
作者:Xuanyu Feng、Pengfei Ji、Zhe Li、Tasha Drake、Pau Oliveres、Emily Y. Chen、Yang Song、Cheng Wang、Wenbin Lin
DOI:10.1021/acscatal.9b00259
日期:2019.4.5
suggested σ-bond metathesis as a key step for the MIL-53(Al)-CoH-catalyzed addition reactions. MIL-53(Al)-FeCl competently catalyzed oxidative Csp3–H amination and Wacker-type alkene oxidation. XANES analysis revealed the oxidation of FeII to FeIII centers in the activated MIL-53(Al)-FeCl catalyst and suggested that oxidative Csp3–H amination occurs via the formation of FeIII–OtBu species by single electron
氧化铝(Al 2 O 3)表面的固有异质性对氧化铝负载的单中心非均相催化剂的开发提出了挑战,并阻碍了在分子水平上催化物种的表征以及对催化反应机理细节的阐明。 。这里,我们报告与式Al(μ在MIL-53(Al)的金属-有机骨架(MOF)的使用氢氧化铝次级结构单元的(事业部)2 -OH)(BDC)(BDC = 1,4-苯二甲酸)作为Al 2 O 3表面的均匀且在结构上定义的功能模拟物,用于负载地球富集金属(EAM)催化剂。该μ 2MIL-53(Al)SBU中的-OH基很容易去质子化,并用CoCl 2和FeCl 2金属化,从而得到MIL-53(Al)-CoCl和MIL-53(Al)-FeCl预催化剂,其特征在于粉末X射线衍射,氮吸附,元素分析,密度泛函理论和扩展X射线精细结构光谱学。用NaBEt 3 H活化将MIL-53(Al)-CoCl转化为MIL-53(Al)-CoH,可有效催化炔烃和腈的硼
Nickel(II)-Catalyzed Borylation of Alkenyl Methyl Ethers via C–O Bond Cleavage
A new protocol has been developed for the borylation of conjugated alkenyl methyl ethers using B2Pin2 via C–O bond cleavage catalyzed by Ni(II). In this cross-coupling reaction, both E/Z isomers of alkenyl ethers are converted into (E)-alkenyl boronic esters with good reactivity. This transformation exhibits high chemoselectivity in the presence of competitive C–O bonds such as aryl ether, ester, amide
Copper-catalyzed Decarboxylative Hydroboration: Synthesis of Vinyl Boronic Esters
作者:Francis Mariaraj Irudayanathan、Gabriel Charles Edwin Raja、Han-Sung Kim、Kyungsu Na、Sunwoo Lee
DOI:10.1002/bkcs.10706
日期:2016.4
Vinyl boronic esters were synthesized from aryl alkynyl carboxylic acids and bis(pinacolato)diboron using a copper‐catalyzed decarboxylative reaction. The reaction was conducted with CuI (10 mol%), bis‐[2‐(diphenylphosphino)phenyl]ether(20 mol%), and LiOMe (20 mol%) in DMSO at 50 °C for 16 h. This method provided the desired vinyl boronic esters in good‐to‐moderate yields and showed good functional
A highly selective cobalt-catalyzed single and double dehydrogenative borylations (DHBs) of terminal alkenes have been developed for the synthesis of trans-monoborylalkenes and diborylalkenes, respectively. While the cobalt-catalyzed double DHBs of aryl 1-alkenes with 2 equiv of bis(pinacolato)diboron (B2pin2) in the presence of 1 equiv of CsF in DMF produce 1,1-diborylalkenes selectively, the double
Cs
<sub>4</sub>
B
<sub>4</sub>
O
<sub>3</sub>
F
<sub>10</sub>
: First Fluorooxoborate with [BF
<sub>4</sub>
] Involving Heteroanionic Units and Extremely Low Melting Point
作者:Ming Xia、Miriding Mutailipu、Fuming Li、Zhihua Yang、Shilie Pan
DOI:10.1002/chem.202101321
日期:2021.7.7
Herein, a new congruently melting mixed-anion compound Cs4B4O3F10 has been characterized as the first fluorooxoborate with [BF4] involving heteroanionic units. Compound Cs4B4O3F10 possesses two highlyfluorinated anionic clusters and therefore its formula can be expressed as Cs3(B3O3F6) ⋅ Cs(BF4). The influence of [BF4] units on micro-symmetry and structural evolution was discussed based on the parent
在此,一种新的同熔混合阴离子化合物 Cs 4 B 4 O 3 F 10已被表征为第一个具有 [BF 4 ] 的含杂阴离子单元的氟代硼酸盐。化合物Cs 4 B 4 O 3 F 10具有两个高度氟化的阴离子簇,因此其分子式可以表示为Cs 3 (B 3 O 3 F 6 ) ⋅ Cs(BF 4 )。基于母体化合物讨论了[BF 4 ]单元对微对称性和结构演化的影响。更重要的是,Cs 4B 4 O 3 F 10在所有可用的硼酸盐中显示出最低的熔点,从而为此类系统创造了新的记录。这项工作对于使用全氟化 [BF 4 ] 单元丰富和定制硼酸盐的结构具有重要意义。