Transition-metal chloride mediated addition reaction of diorganomagnesium to easily enolizable ketones
作者:Mutsumi Sada、Seijiro Matsubara
DOI:10.1016/j.tet.2011.02.009
日期:2011.4
is difficult to perform with Grignardreagent (RMgX) or with diorganomagnesium (R2Mg), because a deprotonation to form a magnesium enolate occurs predominantly. To avoid the prior enolization, a complex reagent of a transition-metal salt and R2Mg was examined: A combination of R2Mg with iron(II) chloride (FeCl2) or ytterbium(III) chloride (YbCl3) gave a complex reagent that can realize a nucleophilic
The Head-to-Head ReductiveCoupling of Homoallylic Alcohols Promoted by Titanium(II)-OlefinComplexes
作者:Oleg G. Kulinkovich、Vladimir E. Isakov
DOI:10.1055/s-2003-39300
日期:——
main products in moderate to good yields. The head-to-head regioselectivity in reductive coupling of 4-penner-1-ol and 5-hexen-2-ol was also observed. Coupling of 2-methyl-5-hexen-2-ol, as well as unsaturated alcohols in which vinyl and hydroxyl groups are more distant from one another, proceeded with head-to-tail or tail-to-tail regioselectivity. It is supposed, that the unusual head-to-head regioselectivity
Gram‐Scale Synthesis of the 1,1,
<i>n</i>
,
<i>n</i>
‐Tetramethyl[
<i>n</i>
](2,11)teropyrenophanes
作者:Kiran Sagar Unikela、Parisa Ghods Ghasemabadi、Václav Houska、Louise N. Dawe、Yuming Zhao、Graham J. Bodwell
DOI:10.1002/chem.202003828
日期:2021.1.4
A gram‐scalesynthesis of a series of 1,1,n,n‐tetramethyl[n](2,11)teropyrenophanes (n=7–9) has been accomplished as well as the first synthesis of the next higher homologue 1,1,10,10‐tetramethyl[10](2,11)teropyrenophane. The scale‐up of the original small‐scalesynthesis required the development of several heavily modified synthetic methods, including a chlorination/Friedel–Crafts alkylation protocol
一系列1,1,n,n-四甲基[ n ](2,11)萜品庚烯(n =7–9)以及下一个更高的同系物1,1,10,10-四甲基[10](2,11)邻苯二甲醛的首次合成已经完成。原始小规模合成的放大规模要求开发几种经过重大改进的合成方法,包括氯化/弗里德尔-克来福特烷基化方案和碘化/ Wurtz偶联方案,它们分别在25-30 g和30-60上进行g鳞片。在合成途径结束时,为关键的萜烯形成环脱氢反应开发了两套独立的条件,一种用于两个不太紧张的同类物的酸促进方法,另一个用于两个紧张的同系物的无酸方法。
Iron(II) Chloride-mediated Addition of Dialkylmagnesium to Carbonyl Compounds
作者:Mutsumi Sada、Seijiro Matsubara
DOI:10.1246/cl.2008.800
日期:2008.7.5
Addition reactions to carbonyl compounds with a complex reagent, prepared from organomagnesium and iron(II) chloride, were examined. The reagent works as effective nucleophile to an easily enolizab...
研究了使用由有机镁和氯化铁 (II) 制备的复杂试剂与羰基化合物的加成反应。该试剂作为有效的亲核试剂可轻松烯醇化...
Acyclic monomers which when cured are reworkable through thermal decomposition
申请人:Cornell Research Foundation, Inc.
公开号:US06355702B1
公开(公告)日:2002-03-12
Compounds containing unsaturated aliphatic moieties which are linked to each other by a tertiary oxycarbonyl containing acyclic moiety are basis for compositions which are cured to polymer networks which are thermally decomposable to provide residue which can be dissolved to allow repair of inoperative assemblies by replacement of inoperative components or recovery or recycling of operative elements which are affixed in assemblies by the cured compositions.