Nonene appears as a clear colorless liquid with a sharp odor. Flash point 75°F. Insoluble in water and less dense than water. Hence floats on water. May irritate skin on contact. Inhalation of vapors may cause irritation. Prolonged inhalation may lead to breathing difficulty. Ingestion causes abdominal discomfort, nausea and diarrhea.
underwent structural transformation in the presence of H2O2 but regenerated to their initial state at the end of the reaction. In particular, the highly dispersed Nb oxoclusters can absorb a large amount of polar organic solvents and thus were swollen greatly, which exhibited “pseudo” liquid phase behavior, and enabled the substrate molecules to be highly accessible to the catalytic center of Nb oxocluster
我们在这里提出了一种新型的铌氧簇,它可以通过羧酸盐离子液体有效地稳定下来。这些功能化的IL在本工作中分别命名为[TBA] [LA],[TBA] [PA]和[TBA] [HPA],其中TBA代表四丁基铵,LA,PA和HPA分别指乳酸,丙酸酯,3 -羟基丙酸酯阴离子。已通过元素分析,NMR,IR,XRD,TGA和HRTEM对合成的Nb氧簇进行了表征。发现[TBA] [LA]稳定的Nb氧簇(Nb-OC @ [TBA] [LA])均匀分散,平均粒径为2-3 nm,并具有极高的催化活性,可选择性氧化各种硫醚。在催化剂负载量低至0.0033 mol%(1 ppm)时,Nb-OC @ [TBA] [LA]催化剂的周转数超过56000。与此同时,通过仅使用0.065mol%的催化剂(50ppm),该催化剂还显示出对烯烃和烯丙基醇的环氧化的高活性。的表征93 Nb NMR光谱表明,Nb氧簇在H 2 O 2存
Highly selective and efficient olefin epoxidation with pure inorganic-ligand supported iron catalysts
efficient and selective epoxidation of alkenes via the design of specialized ligands, which facilitates to control the activity and selectivity of the reactions catalyzed by iron atom. Herein, we report the development of the olefinepoxidation with inorganic-ligand supported iron-catalysts using 30% H2O2 as an oxidant, and the mechanism is similar to iron-porphyrin type. With the catalyst 1, (NH4)3[FeMo6O18(OH)6]
在过去的二十年中,在过渡铁催化的烯烃选择性氧化为环氧化物方面取得了重大进展。在药物,分离的天然产物和精细化学品中发现的常见结构。这些方法中的许多已通过专门配体的设计实现了烯烃的高效和选择性环氧化,这有助于控制铁原子催化的反应的活性和选择性。本文中,我们报道了使用30%H 2 O 2作为氧化剂的无机配体负载的铁催化剂进行烯烃环氧化的研究进展,其机理与铁卟啉类型相似。对于催化剂1,(NH 4)3 [FeMo 6O 18(OH)6 ],各种芳族和脂肪族烯烃均以优异的收率以及化学和立体选择性成功地转化为相应的环氧化物。该催化体系具有能够避免使用昂贵的,有毒的,对空气/湿气敏感的和商业上不可用的有机配体的优点。该方法的通用性易于操作,具有较高的催化活性和优异的稳定性,这使其有可能在工业规模上使用,并可能为通过无机配体配位的铁催化进行催化氧化反应开辟一条道路。。
Metal-Free Catalytic Reductive Cleavage of Enol Ethers
作者:Karina Chulsky、Roman Dobrovetsky
DOI:10.1021/acs.orglett.8b02932
日期:2018.11.2
In contrast to the well-known reductivecleavage of the alkyl–O bond, the cleavage of the alkenyl–O bond is much more challenging especially using metal-free approaches. Unexpectedly, alkenyl–O bonds were reductively cleaved when enol ethers were reacted with Et3SiH and a catalytic amount of B(C6F5)3. Supposedly, this reaction is the result of a B(C6F5)3-catalyzed tandem hydrosilylation reaction and
与众所周知的烷基-O键的还原裂解相反,烯基-O键的裂解更具挑战性,尤其是使用无金属方法时。出乎意料的是,当烯醇醚与Et 3 SiH和催化量的B(C 6 F 5)3反应时,烯基-O键被还原性裂解。据推测,该反应是B(C 6 F 5)3催化的串联氢化硅烷化反应和硅辅助的β-消除的结果。基于实验和密度泛函理论(DFT)计算,提出了这种裂解反应的机理。
Methylformate as replacement of syngas in one-pot catalytic synthesis of amines from olefins
general approach for the one-pot hydroaminomethylation of olefinsusing methylformate as formylating agent instead of synthesis gas (syngas) has been proposed. Herein we report that a Ru–Rh catalytic system demonstrates high activity in a tandem conversion of a series of n-alkenes into aminesusing methylformate with yields 58–92% (6 h). The selectivity for the normal amine reached 96% with catalysis by
Hydroformylation in perfluorinated solvents; improved selectivity, catalyst retention and product separation
作者:Douglas F Foster、David Gudmunsen、Dave J Adams、Alison M Stuart、Eric G Hope、David J Cole-Hamilton、Gary P Schwarz、Peter Pogorzelec
DOI:10.1016/s0040-4020(02)00215-6
日期:2002.5
hydroformylation of linear terminal alkenes using rhodium based catalysts under fluorous biphasic conditions in the presence and absence of toluene is reported. Using fluorinated ponytails to modify triarylphosphites and triarylphosphines, good selectivities and reactivities can be obtained, along with good retention of the catalyst and ligand within the fluorous phase. Using P(O–4-C6H4C6F13)3 (P/Rh=3:1) as the
据报道,在氟的双相条件下,在存在和不存在甲苯的情况下,使用铑基催化剂将线性末端烯烃加氢甲酰化。使用氟化的马尾辫来修饰亚磷酸三芳基酯和亚磷酸三芳基酯,可以获得很好的选择性和反应性,以及催化剂和配体在氟相中的良好保留。使用P(O–4-C 6 H 4 C 6 F 13)3(P / Rh = 3∶1)作为甲苯/全氟-1,3-二甲基环己烷中的配体,在60℃下获得了良好的结果,但是随着温度的升高,催化剂和/或配体发生分解。通过以更高的速率,更好的l / b比以及以全氟化碳溶剂形式更好地保留催化剂和亚磷酸酯而省略甲苯,可以获得更令人印象深刻的结果。竞争性异构化将线性醛的选择性限制在<76%。当P(4-C 6 H 4 C 6 F 13)3在没有甲苯的情况下将其用作配体,甚至可以获得更令人印象深刻的结果,线性醛的选择性高达80.9%,高速率,保留率高达99.95%的铑和高达96.7%的膦在氟相中。将这些结果