results. Common methods for the synthesis of Grignard reagents from metallic magnesium present safety issues and exhibit a batch-to-batch variability. Tubular reactors of solid reagents combined with solution-phase reagents enable the continuous-flow preparation of organomagnesium reagents. The use of stratified packed-bed columns of magnesium metal and lithium chloride for the synthesis of highly concentrated
Preparation of Polyfunctionalized Aromatic Nitriles from Aryl Oxazolines
作者:A. Hess、H. C. Guelen、N. Alandini、A. Mourati、Y. C. Guersoy、P. Knochel
DOI:10.1002/chem.202103700
日期:2022.1.3
Aryl nitriles from oxazolines: We report a new method for for preparing highly functionalized tri-, tetra- and penta-substituted aromaticnitriles by using two successive magnesiations with sBu2Mg in toluene followed by trapping reactions with a broad range of electrophiles followed by an efficient conversion of the oxazolyl-directing group to a nitrile function by using oxalyl chloride and catalytic
来自恶唑啉的芳基腈:我们报道了一种制备高官能化三、四和五取代芳香腈的新方法,该方法通过在甲苯中使用s Bu 2 Mg 进行两次连续的镁化,然后与多种亲电子试剂发生捕获反应,然后使用草酰氯和催化量的 DMF(50 °C,4 小时)将恶唑基导向基团有效转化为腈官能团。
Palladium(I) Dimer Enabled Extremely Rapid and Chemoselective Alkylation of Aryl Bromides over Triflates and Chlorides in Air
Disclosed herein is the first general chemo- and site-selective alkylation of C-Br bonds in the presence of COTf, C-Cl and other potentially reactive functional groups, using the air-, moisture-, and thermally stable dinuclear PdI catalyst, [Pd(μ-I)PtBu3 ]2 . The bromo-selectivity is independent of the substrate and the relative positioning of the competing reaction sites, and as such fully predictable
作者:Manuel Guisán-Ceinos、Rita Soler-Yanes、Daniel Collado-Sanz、Vilas B. Phapale、Elena Buñuel、Diego J. Cárdenas
DOI:10.1002/chem.201300882
日期:2013.6.24
reaction involving cyclization followed by cross‐coupling allows the formation of up to three alkyl–alkyl bonds in a single operation by using alkene‐containing alkyl iodides and Grignard reagents (see scheme; acac=acetylacetonate; TMEDA=N,N′,N′‐tetramethyl ethylenediamine). Mechanistic experimental and computational studies suggest a NiI–NiII–NiIII catalytic cycle and the intermediacy of radicals.
提出新颖的断开连接:强大的镍催化级联反应,包括环化和交叉偶联,通过使用含烯烃的烷基碘化物和格利雅试剂,一次操作最多可形成三个烷基-烷基键(请参阅方案; acac =乙酰丙酮酸酯) ; TMEDA = N,N ',N'-四甲基乙二胺)。力学实验和计算研究表明,Ni I –Ni II –Ni III催化循环和自由基的中介。
Polymerization of supramolecular assemblies: Comparison of lamellar and inverted hexagonal phases
作者:Warunee Srisiri、Youn-Sik Lee、Thomas M. Sisson、Bruce Bondurant、David F. O'Brien
DOI:10.1016/s0040-4020(97)00969-1
日期:1997.11
extended this strategy to successfully polymerize the inverted hexagonal (HII) phase. This report is the first comparison of radical chain polymerizations in lamellar and HII phases. The number average degree of polymerization of polymers obtained in both lamellar and HII phases depended strongly on the initiation chemistry, but were insensitive to the lipid phases. The immediate benefit of these studies