A process for preparing monoesters comprises the step of reacting at least one diol with at least one carboxylic acid in a biphasic solvent system, the carboxylic acid being sufficiently water soluble to allow esterification to occur, and the biphasic solvent system comprising water and at least one aprotic solvent in which the resulting monoester has greater solubility than in water.
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。
The Development of Synthetic Routes to 1,1,<i>n</i>,<i>n</i>-Tetramethyl[<i>n</i>](2,11)teropyrenophanes
作者:Kiran Sagar Unikela、Bradley L. Merner、Parisa Ghods Ghasemabadi、C. Chad Warford、Christopher S. Qiu、Louise N. Dawe、Yuming Zhao、Graham J. Bodwell
DOI:10.1002/ejoc.201900707
日期:2019.7.31
BIG BEND chimes in – this is not second hand news! Every minute detail of the synthesis of a striking series of 1,1,n,n‐tetramethyl[n](2,11)teropyrenophanes (n=7–9) is described. The end‐to‐end bend in the teropyrene system clocks in at as much as 177.9°.
大弯曲声响起–这不是二手新闻!详细介绍了惊人的1,1, n, n-四甲基[ n ](2,11)萜烯基庚烯( n = 7–9)系列的合成。萜品system体系的端对端弯曲时脉可达177.9°。
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.