Oxidations by the reagent “O2–H2O2–vanadium derivative–pyrazine-2-carboxylic acid’. Part 12. Main features, kinetics and mechanism of alkane hydroperoxidation†
作者:Georgiy B. Shul’pin、Yuriy N. Kozlov、Galina V. Nizova、Georg Süss-Fink、Sandrine Stanislas、Alex Kitaygorodskiy、Vera S. Kulikova
DOI:10.1039/b101442k
日期:——
Various combinations of vanadium derivatives (n-Bu4NVO3 is the best catalyst) with pyrazine-2-carboxylic acid (PCA) catalyse the oxidation of saturated hydrocarbons, RH, with hydrogen peroxide and air in acetonitrile solution to produce, at temperatures <40 °C, alkyl hydroperoxides, ROOH, as the main primary products. These compounds are easily reduced with triphenylphosphine to the corresponding alcohols
钒衍生物的各种组合(n -Bu 4 NVO 3是最好的催化剂),用吡嗪-2-羧酸(PCA)催化饱和烃RH的氧化,用过氧化氢和空气在乙腈溶液中的氧化,在<40°C的温度下生成烷基氢过氧化物ROOH作为主要催化剂农产品。这些化合物容易被三苯基膦还原成相应的醇,然后可以通过GLC定量测定。某些类似于PCA的氨基酸可以起到助催化剂的作用;但是,吡啶甲酸和咪唑-4,5-二羧酸的氧化速率和最终产物收率较低,而咪唑-4-羧酸和吡唑-3,5-二羧酸几乎没有活性。羟基自由基对烷烃RH的攻击引起氧化,从而产生烷基R 4。后者进一步与分子大气中的氧迅速反应。这样形成的过氧自由基ROO 3可以转化为氢过氧化物烷基。根据对环己烷氧化的动力学研究,我们得出结论,反应的限速步骤是含有一个配位PCA分子的复合物的单分子分解:VV(PCA)(H 2 O 2)→V IV(PCA)+HOO˙+ H +。在V IV由此物种发生反应形成进一步与第二H
[EN] DABIGATRAN CYCLIC ESTER DERIVATIVE, AND METHOD FOR PREPARATION AND PHARMACEUTICAL USE THEREOF<br/>[FR] DÉRIVÉ D'ESTER CYCLIQUE DE DABIGATRAN ET PROCÉDÉ DE PRÉPARATION ET D'UTILISATION PHARMACEUTIQUE DE CELUI-CI<br/>[ZH] 一种达比加群环基酯衍生物及其制备方法和在药学上的用途
BROWN, HERBERT C.;MIDLAND, M. MARK, TETRAHEDRON, 43,(1987) N 18, 4059-4070
作者:BROWN, HERBERT C.、MIDLAND, M. MARK
DOI:——
日期:——
Luminescent material and organic electroluminescent device using the same
申请人:Wang Guofang
公开号:US20100025661A1
公开(公告)日:2010-02-04
The subject of the present invention is to provide an emission material which contributes to high emission efficiency, low drive voltage, excellent heat resistance and long life in an organic electroluminescent device, particularly an emission material which is excellent in emission of blue color. Further, the subject is to provide an organic electroluminescent device using the above emission material. The above subjects can be achieved by an emission material represented by Formula (1) and an organic electroluminescent device comprising the same.
wherein R
1
to R
7
are independently hydrogen, alkyl or cycloalkyl; Ar
1
is one selected from the group consisting of non-condensed aryl having 6 to 50 carbon atoms, 2-naphthyl, 9-phenanthryl, 6-chrysenyl, 2-triphenylenyl, 2-fluorenyl, 9-carbazolyl, 2-thienyl and 2-benzothienyl; and Ar
2
and Ar
3
are independently non-condensed aryl having 6 to 50 carbon atoms, condensed aryl having 10 to 50 carbon atoms or heteroaryl having 2 to 50 carbon atoms.
Organoboranes for synthesis. 6.
作者:Herbert C. Brown、M.Mark Midland
DOI:10.1016/s0040-4020(01)83444-x
日期:1987.1
hydroperoxides in excellent yields. The autoxidation of organoboranes is inhibited by iodine or such free-radical scavengers. A study of the inhibition by iodine of the oxidation of representative trialkylboranes indicates that the rate of initiation decreases with an increase in the steric crowding about the boron atom. The rate of inhibition of the autoxidation of trialkylboranes by iodine reveals that