Generation and Reactivity Studies of Diarylmethyl Radical Pairs in Crystalline Tetraarylacetones via Laser Flash Photolysis Using Nanocrystalline Suspensions
作者:Jin H. Park、Melissa Hughs、Tim S. Chung、A. Jean-Luc Ayitou、Vanessa M. Breslin、Miguel A. Garcia-Garibay
DOI:10.1021/jacs.7b04449
日期:2017.9.27
The nanosecond electronic spectra and kinetics of the radical pairs from various crystalline tetraarylacetones were obtained using transmission laser flashphotolysis methods by taking advantage of aqueous nanocrystalline suspensions in the presence of submicellar CTAB, which acts as a surface passivator. After showing that all tetraarylacetones react efficiently by a photodecarbonylation reaction
THERMOSETTING ALKOXYSILYL COMPOUND HAVING TWO OR MORE ALKOXYSILYL GROUPS, COMPOSITION AND CURED PRODUCT COMPRISING SAME, USE THEREOF, AND METHOD FOR PREPARING ALKOXYSILYL COMPOUND
申请人:KOREA INSTITUTE OF INDUSTRIAL TECHNOLOGY
公开号:US20180155370A1
公开(公告)日:2018-06-07
The present invention relates to: a thermosetting alkoxysilyl compound (hereinafter, referred to as “alkoxysilyl compound”)having two or more alkoxysilyl groups showing excellent heat-resistance characteristics in a composite; a composition and a cured product comprising the same; a use thereof; and a method for preparing an alkoxysilyl compound. The composition of an alkoxysilyl compound, comprising a novel alkoxysilyl compound according to the present invention shows, in a composite, improved heat-resistance characteristics, i.e., an effect of decreasing the CTE of the composition of an alkoxysilyl compound and not showing a glass transition temperature (hereinafter, referred to as “Tg-less”). Further, the cured product comprising an alkoxysilyl compound according to the present invention shows excellent flame retardant properties due to the alkoxysilyl groups.
2-Methoxyalkanoic acids were found to undergo consecutive decarbonylative α,α-diarylation in P2O5-MsOH instead of Friedel-Crafts type arylation on the carbonyl carbon. The influence of the substituents of the arenes and the carboxylic acids in this reaction was elucidated based on the reaction yields. The reaction behavior was found to be primarily governed by the electron-withdrawing/releasing property
发现2-甲氧基链烷酸在P 2 O 5 -MsOH中经历连续的脱羰基α,α-二芳基化,而不是在羰基碳上进行Friedel-Crafts型芳基化。基于反应产率,阐明了芳烃和羧酸的取代基在该反应中的影响。发现反应行为主要受羧酸上α-取代基的吸电子/释放性能以及芳烃的正种接受能力支配。已显示出空间位阻参与确定反应的可行性,并将其作为次要因素。
Palladium-Catalyzed Reaction of 2-Hydroxy-2-methylpropiophenone with Aryl Bromides: A Unique Multiple Arylation via Successive C−C and C−H Bond Cleavages
2-Hydroxy-2-methylpropiophenone undergoes a unique multiple arylation via C-C and C-H bondcleavages upon treatment with excess aryl bromides in the presence of a palladium catalyst to give 1,1,2,2-tetraarylethanes and 4,4-diaryl-1-phenylisochroman-3-ones.
2-Hydroxy-2-methylpropiophenone 在钯催化剂存在下用过量的芳基溴化物处理后,通过 CC 和 CH 键裂解发生独特的多重芳基化,得到 1,1,2,2-四芳基乙烷和 4,4-二芳基-1 -phenylisochroman-3-ones。
RESIST UNDERLAYER FILM MATERIAL, PATTERNING PROCESS, AND METHOD FOR FORMING RESIST UNDERLAYER FILM
申请人:SHIN-ETSU CHEMICAL CO., LTD.
公开号:US20210397092A1
公开(公告)日:2021-12-23
A resist underlayer film material used in multilayer resist method contains (A) compound shown by following general formula (1), and (B) organic solvent, where X independently represents monovalent organic group shown by following general formula (2); W contains an “m” number of partial structures each independently shown by following formula (3); “m” and “n” each represent an integer of 1 to 10; broken lines represent bonding arms; Z represents aromatic group; A represents single bond or —O—(CH
2
)
p
—; “k” represents integer of 1 to 5; “p” represents integer of 1 to 10; R
01
represents hydrogen atom or monovalent organic group having 1 to 10 carbon atoms. Material is capable of forming resist underlayer film excellent in planarizing property in fine patterning process by multilayer resist method in semiconductor-device manufacturing process; and patterning processes and methods for forming resist underlayer film use material.