Cross-Coupling of Non-activated Chloroalkanes with Aryl Grignard Reagents in the Presence of Iron/<i>N</i>-Heterocyclic Carbene Catalysts
作者:Sujit K. Ghorai、Masayoshi Jin、Takuji Hatakeyama、Masaharu Nakamura
DOI:10.1021/ol2031729
日期:2012.2.17
An efficient and high-yielding cross-couplingreaction of various primary, secondary, and tertiary alkyl chlorides with aryl Grignard reagents was achieved by using catalytic amounts of N-heterocyclic carbene ligands and iron salts. This reaction is a simple and efficient arylation method having applicability to a wide range of industrially abundant chloroalkanes, including polychloroalkanes, which
Fe-promoted cross coupling of homobenzylic methyl ethers with Grignard reagents via sp3 C–O bond cleavage
作者:Shuang Luo、Da-Gang Yu、Ru-Yi Zhu、Xin Wang、Lei Wang、Zhang-Jie Shi
DOI:10.1039/c3cc43616k
日期:——
The first iron-catalyzed formal cross coupling of homobenzylic methyl ethers with alkyl Grignardreagents is realized. The reaction is proposed to proceed through a sequence of dehydroalkoxylation to form the vinyl-intermediate, followed by Fe-catalyzed selective carbometalation to form a benzylic Grignardreagent.
Synergistic effects of alkali metals in the alkylation of naphthalene and toluene with ethene in the ArH–alkali metal systems in THF (ArH – naphthalene, phenanthrene)
synergistic effect of lithium and sodium was found on studying the toluene alkylation with ethene in the phenanthrene–Li–Na systems in THF (a (Li + Na):phenanthrene ratio is 3:1). An addition of potassium to sodium also considerably increases the efficiency of the toluene and naphthalene alkylation with ethene in the naphthalene-based systems. The possible mechanism of the alkalimetal synergism in the above-mentioned
在THF中的萘-碱金属体系中使用金属锂和钠的混合物会导致在室温和大气压下萘与乙烯的烷基烷基化协同促进作用。Li∶Na摩尔比为2∶1时,观察到最大的协同作用。在这些条件下,萘到烷基化产物(线性的1-烷基萘及其二氢衍生物)的总转化率在24小时后(a(Li + Na):C 10 H 8)达到88%。比例为2:1)。然而,在这种体系中使用金属锂和钾的混合物导致烷基化过程的协同延迟。在Li∶K摩尔比为1∶1时观察到最强的阻滞作用。在THF中萘-碱金属体系中,甲苯与乙烯进行烷基甲苯烷基化的效率也随着混合物中锂或钠的替代而提高。Li:Na摩尔比为1:3可获得最佳结果。在这个Li:Na比的情况下,甲苯几乎定量地转化为线性和α-支化的高级单烷基苯(24 h,(Li + Na):C 10 H 8 = 2:1)。在将锂和钠的混合物引入系统中之后,在甲苯存在下萘与乙烯的烷基烷基化速率也得以提高。但是,活性的最大值在这里向更高的锂含量(Li:Na
Process for preparing long chain alkylaromatic compounds
申请人:Mobil Oil Corporation
公开号:US05516954A1
公开(公告)日:1996-05-14
Long chain alkyl aromatic compounds are prepared by alkylating an alkylatable aromatic compound with a long chain alkylating agent in the presence of a catalyst comprising an acidic solid material which comprises a Group IVB metal oxide, such as zirconia, modified with an oxyanion of a Group VIB metal, such as tungstate.
Redox-photosensitized reaction of indene using photosensitive surfactant in emulsion: dependence on oil droplet size and surfactant charge
作者:Yasuharu Yoshimi、Tatsuya Itou、Minoru Hatanaka
DOI:10.1016/j.tetlet.2006.03.038
日期:2006.5
A redox-photoscrisitized reaction of indene 2 using a photosensitive surfactant la in an oil-in-water emulsion proceeded efficiently to give alcohol 3 as a major product and is strongly influenced by the oil droplet size and surfactant charge. (c) 2006 Elsevier Ltd. All rights reserved.