Reactivities of Carbonyl Compounds in Acid-Catalyzed Hydride Transfer<i>vs.</i>Electron Transfer
作者:Shunichi Fukuzumi、Morifumi Fujita
DOI:10.1246/cl.1991.2059
日期:1991.11
Rate constants for acid-catalyzed hydride-transfer reactions from triethylsilane to a series of carbonylcompounds are compared with those for acid-catalyzed electron transfer from the excited state of [Ru(bpy)3]2+ to the same series of carbonylcompounds in the presence of HClO4 in acetonitrile at 298 K.
将酸催化氢化物转移反应从三乙基硅烷到一系列羰基化合物的速率常数与酸催化电子从 [Ru(bpy)3]2+ 的激发态转移到同一系列羰基化合物的速率常数进行比较。在 298 K 的乙腈中存在 HClO4。
Catalytic dehydrative etherification and chlorination of benzyl alcohols in ionic liquids
作者:Hassan A. Kalviri、Chad F. Petten、Francesca M. Kerton
DOI:10.1039/b909866f
日期:——
Dibenzyl ethers and benzyl chloride can be obtained in moderate to excellent yields through Pd-catalysed reactions in hydrophobic ionic liquids using microwave or conventional heating.
在疏水性离子液体中,通过钯催化的反应,利用微波或常规加热,可以中等至优异的产率获得二苄醚和苄氯。
An experimental investigation of the cross-flow of power law liquids past a bundle of cylinders and in a bed of stacked screens
作者:D. V. N. Prasad、R. P. Chhabra
DOI:10.1002/cjce.5450790106
日期:2001.2
pour une serie de solution aqueuses de carboxymethyle cellulose et d'alginate desodium inelastiques. Les valeurs de facteurs de friction obtenues montrent une bonne correlation avec une definition modifiee du nombre de Reynolds reposant sur la representation en faisceaux capillaires du lit. Lesnouvelles donnees etendent considerablement la gamme des valeurs de vide de ∼0, 6 a ∼0, 87. Des comparaisons
已通过实验研究了垂直于圆柱阵列和筛床中的幂律聚合物溶液的稳定流动。对一系列非弹性羧甲基纤维素和海藻酸钠水溶液的不同空隙率的三个不同测试池(两个管束和一个由筛网制成的床)进行了广泛的压降测量。摩擦系数的结果值与基于床的毛细管束表示的雷诺数的修改定义很好地相关。新数据大大扩展了空隙率值的范围,从~0.6 到~0.87。在目前的实验数据和我们之前基于使用简单细胞模型的计算之间也进行了广泛的比较。两者之间的密切对应证明了这种理想化分析的实用性。总而言之,目前的结果包含以下物理和运动学条件范围:雷诺数:0.01 至 ∼1200;幂律流动行为指数:0.38比1;和三个空隙率值,即0.74、0.78和0.87。在 a etudie de facon experimentale l'ecoulement en 制度永久 perpendiculairement 一个 des 安排 de cylindres et
[EN] NOVEL PROTECTING REAGENTS, PROTECTING GROUPS AND METHODS OF FORMING AND USING THE SAME<br/>[FR] NOUVEAUX REACTIFS DE PROTECTION, GROUPES DE PROTECTION, ET METHODES DE FORMATION ET D'UTILISATION DESDITS REACTIFS ET GROUPES
申请人:UNIV MISSISSIPI
公开号:WO2005100329A1
公开(公告)日:2005-10-27
New protecting reagents are provided that allow for the selective placement of a new protecting group onto a reactive site of a multifunctional compound. The reagents are 2, 3, and 4-trialkylsilylxylyl, triarylsilylxylyl or a combination of alkyl-aryl silylxylyl reagents (TIX reagents), which carry a TIX protecting group for protecting alcohols as ethers, urethanes, carbonates, acetals; amines as carbamates or ureas; and thiols as ethers or esters. The invention also provides methods of forming the 2, 3, and 4-TIX reagents; introducing the TIX protecting groups to molecules bearing hydroxyl groups, amine groups, or thiol groups; methods of removing the TIX protecting groups; and intermediate compounds formed during any one of these methods. The invention further provides methods useful in producing epothilones and analogs and derivatives thereof.
pathway for the Pd-catalyzed regiospecific ortho-acylation of azoarenes using benzylic ethers as acyl equivalents has been achieved. In the absence of palladium catalyst, amide compounds were formed by the reaction of azoarenes with benzylic ethers under certain conditions. Various mono-acylazobenzene and amide compounds were obtained in good yields (35 examples). The mono-acylated products and amide