Aroyl ketone derivative, UV ray absorber comprising the same, and
申请人:Kao Corporation
公开号:US05191121A1
公开(公告)日:1993-03-02
A novel aroyl ketone derivative represented by formula (I) is disclosed. Ar(COCH.sub.2 COR.sup.1).sub.n (I) wherein R.sup.1 represents a saturated or unsaturated hydrocarbon group having 1-24 carbon atoms, or a linear or branched alkoxyalkyl or alkenyloxyalkyl group having 1-24 carbon atoms, dialkylamino group having 1-24 carbon atoms, Ar represents a benzene or naphthalene ring which may be substituted with one or more hydroxyl groups, alkoxy groups having 1-24 carbon atoms, alkenyloxy groups having 1-24 carbon atoms, polyoxyleneoxy groups, mono- or dialkyl amino groups having 1-24 carbon atoms, or .alpha.-methylenedioxy groups, and n denotes an integer of 1-4. An UV-ray absorber and cosmetic composition comprising the aroyl ketone derivative of formula (I) are also disclosed. Aroyl ketone derivative (I) of the present invention can provide an excellent UV-ray absorbing effect and has outstanding stability against light, and the UV-ray absorber or cosmetic composition containing the aroyl ketone derivative (I) can exhibit an excellent sunscreening effect.
Solid-Supported Acids as Mild and Versatile Reagents for the Deprotection of Aromatic Ethers
作者:Poonsakdi Ploypradith、Pannarin Cheryklin、Nattisa Niyomtham、Daniel R. Bertoni、Somsak Ruchirawat
DOI:10.1021/ol070781+
日期:2007.7.1
p-Toluene sulfonic acid (p-TsOH) immobilized either on polystyrene (PS) or silica (Si) was found to be effective in cleaving aromaticethers containing isopropyl, tert-butyl, allyl, and benzyl groups, as well as mono-, di-, and trimethoxylated benzyl groups, in moderate to excellent yields (54-95%). These protecting groups could be selectively deprotected when they were simultaneously present on the
COMPOUND, SUBSTRATE FOR PATTERN FORMATION, PHOTODEGRADABLE COUPLING AGENT, PATTERN FORMATION METHOD, AND TRANSISTOR PRODUCTION METHOD
申请人:NIKON CORPORATION
公开号:US20190352260A1
公开(公告)日:2019-11-21
Provided is a compound represented by Formula (1).
提供的化合物由化学式(1)表示。
Traceless Photolabile Linker Expedites the Chemical Synthesis of Complex Oligosaccharides by Automated Glycan Assembly
作者:Kim Le Mai Hoang、Alonso Pardo-Vargas、Yuntao Zhu、Yang Yu、Mirco Loria、Martina Delbianco、Peter H. Seeberger
DOI:10.1021/jacs.9b03769
日期:2019.6.5
synthetic oligosaccharides to meet the demand for defined glycans as tools for molecular glycobiology. The linkers used to connect the growing glycan chain to the solid support play a pivotal role in the synthesis strategy as they determine all chemical conditions used during the synthesis and the form of the glycan obtained at the end of it. Here, we describe a traceless photolabile linker used to prepare
自动聚糖组装 (AGA) 旨在加速合成寡糖的获取,以满足将定义的聚糖作为分子糖生物学工具的需求。用于将不断增长的聚糖链连接到固体支持物的接头在合成策略中起着关键作用,因为它们决定了合成过程中使用的所有化学条件以及合成结束时获得的聚糖的形式。在这里,我们描述了一种用于制备具有自由还原端的碳水化合物的无痕光不稳定链接器。连接器的邻硝基苄基支架的修饰是高产量和与 AGA 工作流程兼容的关键。描述了由 AGA 和线性以及支链 β-低聚糖制备的寡糖片段组装不对称双天线 N-聚糖以说明该方法的功效。
Facile access to the 2,2-difluoro-2,3-dihydrofuran skeleton without extra additives: DMF-promoted difluorocarbene formation of ClCF<sub>2</sub>CO<sub>2</sub>Na
A practical and facile difluorocarbene-triggered cycloaddition reaction of enaminones was developed, which delivered 2,2-difluoro-2,3-dihydrofurans without any extra additives.