Redox-Triggered Switchable Synthesis of 3,4-Dihydroquinolin-2(1<i>H</i>)-one Derivatives via Hydride Transfer/<i>N</i>-Dealkylation/<i>N</i>-Acylation
作者:Xiaoyu Yang、Liang Wang、Fangzhi Hu、Lubin Xu、Sanming Li、Shuai-Shuai Li
DOI:10.1021/acs.orglett.0c03863
日期:2021.1.15
The switchable synthesis of 3-non, 3-mono, 3,3′-disubstituted 3,4-dihydroquinolin-2(1H)-ones was developed through a redox-neutral hydride-transfer/N-dealkylation/N-acylation strategy from o-aminobenzaldehyde with 4-hydroxycoumarin, and Meldrum’s acid, respectively. The unprecedented strategy for the synthesis of 3,3′-highly functionalized 3,4-dihydroquinolin-2(1H)-one has been realized with the in
POLYVINYL ACETAL RESIN, SLURRY COMPOSITION PREPARED THEREFROM, CERAMIC GREEN SHEET, AND MULTILAYER CERAMIC CAPACITOR
申请人:Kuraray Co., Ltd.
公开号:EP2607390A1
公开(公告)日:2013-06-26
According to the present invention, provided is a polyvinyl acetal resin capable of obtaining a ceramic green sheet that has sufficient mechanical strength, in which the dimensional change in the storage of ceramic green sheet is small, and the delamination hardly occurs in the delipidation.
The present invention relates to a polyvinyl acetal resin that has a degree of polymerization of 200 or more to 6000 or less, a content percentage of vinylester unit of 0.01 to 30 mol%, a degree of acetalization of 55 to 83 mol%, and a structural unit represented by Chemical formula (1):
in a molecule.
ALKYL-MODIFIED VINYL ACETAL POLYMER AND COMPOSITION
申请人:Kuraray Co., Ltd.
公开号:EP2692749A1
公开(公告)日:2014-02-05
Provided are a vinyl acetal polymer that has sufficient plasticity and solubility in an alcohol solvent, imparts low viscosity, stability, etc., to a solution thereof, is less likely to cause phase separation from other components, and allows for formation of a slurry superior in dispersibility of particles and thixotropic nature, as well as a sheet superior in strength and flexibility, and the like. An alkyl-modified vinyl acetal polymer obtained by subjecting an alkyl-modified vinyl alcohol polymer to acetalization, in which the alkyl-modified vinyl alcohol polymer comprises a monomer unit represented by the following general formula (I), and has a viscosity average degree of polymerization P of 150 or greater and 5,000 or less, a degree of saponification of 20 mol% or greater and 99.99 mol% or less, and a percentage of alkyl modification S with the monomer unit of 0.05 mol% or greater and 5 mol% or less.
本发明提供了一种乙烯基缩醛聚合物,该聚合物在醇类溶剂中具有足够的可塑性和溶解性,可使其溶液具有低粘度和稳定性等,不易与其他成分发生相分离,并可形成在颗粒分散性和触变性方面更优越的浆料,以及在强度和柔韧性方面更优越的片材等。一种烷基改性乙烯基缩醛聚合物,通过对烷基改性乙烯基醇聚合物进行缩醛化而获得,其中烷基改性乙烯基醇聚合物包含由下式通式(I)表示的单体单元,其粘度平均聚合度 P 为 150 或以上、5000 或以下,皂化度为 20 摩尔%或以上、99.99 摩尔%或以下,烷基改性 S 与单体单元的百分比为 0.05 摩尔%或以上、5 摩尔%或以下。
BINDER FOR FORMATION OF CERAMIC OR FOR USE IN CONDUCTIVE PASTE, AND USE OF SAME
申请人:Kuraray Co., Ltd.
公开号:EP3109263A9
公开(公告)日:2017-04-12
There is provided a binder for ceramic formation or a conductive paste, comprising polyvinyl acetal having a degree of acetalization of from 50 to 85 mol%, a content of vinyl ester monomer unit of from 0.1 to 20 mol%, and having a viscosity-average degree of polymerization of from 200 to 5000, wherein a peak-top molecular weight (A) as measured by a differential refractive index detector and a peak-top molecular weight (B) as measured by an absorptiometer (measurement wavelength: 280 nm) in gel permeation chromatographic measurement of the polyvinyl acetal heated at 230°C for 3 hours satisfy a formula (1) (A-B)/A < 0.60 and the polyvinyl acetal has an absorbance in the peak-top molecular weight (B) of from 0.50 × 10-3 to 1.00 × 10-2.