NOVEL REACTIONS OF AMINOOXOSULFONIUM YLIDE WITH EPOXIDES
作者:Kentaro Okuma、Kenshin Nishimura、Hiroshi Ohta
DOI:10.1246/cl.1984.93
日期:1984.1.5
Reactions of (dimethylamino)phenyloxosulfonium methylide with epoxides were carried out. When aromatic epoxides were used as substrates, cyclopropyl sulfones and oxetanes were obtained. When aliphatic epoxides were used, the products were only the cyclopropyl sulfones. While the aminooxosulfonium ylide acts as a methylene transfer reagent to give the corresponding oxetanes, an intramolecular SN2 type
Stereospecific Consecutive Epoxide Ring Expansion with Dimethylsulfoxonium Methylide
作者:Ekaterina D. Butova、Anastasiya V. Barabash、Anna A. Petrova、Christian M. Kleiner、Peter R. Schreiner、Andrey A. Fokin
DOI:10.1021/jo101330p
日期:2010.9.17
Consecutive ring-expansion reactions of oxiranes with dimethylsulfxonium methylide were studied experimentally and modeled computationally at the density functional theory (DFT) and second-order Møller−Plesset (MP2) levels of theory utilizing a polarizable continuum model (PCM) to account for solvent effects. While the epoxide to oxetane ring expansion requires 13−17 kcal mol−1 activation and occurs
Highly selective and direct electroreductive ring-opening carboxylation of epoxides with CO2 in an undivided cell to yield synthetically important β-hydroxy acids is described. CO2functions not only as a carboxylative reagent in this reaction but also as a promoter to enable efficient and chemoselective transformation of epoxides under additive-free electrochemical conditions.
描述了在未分裂的电池中用 CO 2对环氧化物进行高选择性和直接的还原性开环羧化,以产生合成重要的β-羟基酸。CO 2不仅在该反应中充当羧化试剂,而且还充当促进剂以在无添加剂的电化学条件下实现环氧化物的有效和化学选择性转化。
CURABLE COMPOSITION FOR SEALING OPTICAL SEMICONDUCTOR
申请人:Daicel Corporation
公开号:EP3006481A1
公开(公告)日:2016-04-13
A curable composition according to the present invention for sealing optical semiconductor includes components (A), (B), and (C). Another curable composition according to the present invention for sealing optical semiconductor further includes a component (D) in addition to the components (A), (B) and (C). The component (A) is a compound containing at least one functional group selected from the group consisting of epoxy groups, oxetanyl groups, vinyl ether groups, and (meth)acryloyl groups. The component (B) is a cycloaliphatic epoxy compound. The component (C) is a curing catalyst including a cationic component and an anionic component and generating an acid upon application of light or heat, where the cationic component contains an aromatic ring, and the anionic component contains a central element selected from boron and phosphorus. The component (D) is conductive fiber-bearing particles each including a particulate substance and a fibrous conductive substance lying on or over the particulate substance.