The synthesis and properties of a series of strong but hindered organic bases
作者:Derek H. R. Barton、John D. Elliott、Stephen D. Géro
DOI:10.1039/c39810001136
日期:——
A series of highly hindered N1,N2N2,N3,N3-penta-alkylguanidines has been synthesised from inexpensive starting materials; these strongbases show interesting effects in organicsynthesis.
已经从廉价的起始原料合成了一系列高度受阻的N 1,N 2 N 2,N 3,N 3-戊烷基胍。这些强碱在有机合成中显示出有趣的作用。
CARBON DIOXIDE ABSORBENT AND METHOD OF USING THE SAME
申请人:Perry Robert James
公开号:US20110308390A1
公开(公告)日:2011-12-22
In accordance with one aspect, the present invention provides a composition which contains the amino-siloxane structures I, or III, as described herein. The composition is useful for the capture of carbon dioxide from process streams. In addition, the present invention provides methods of preparing the amino-siloxane composition. Another aspect of the present invention provides methods for reducing the amount of carbon dioxide in a process stream employing the amino-siloxane compositions of the invention, as species which react with carbon dioxide to form an adduct with carbon dioxide.
Steric and repeated-collision effects in diffusion-controlled reactions in solution: kinetics of formation of some iodine donor–acceptor complexes of sulphur compounds
作者:Edward F. Caldin、L. de Forest、Alan Queen
DOI:10.1039/ft9908601549
日期:——
Rates of formation of electron donor–electron acceptor complexes of iodine with some compounds of the general formula R2CS with iodine (R2CS⋯I—I) in 1-chlorobutane have been determined by means of a microwave temperature-jump apparatus. For each of these reactions, the observed forward rate constant (kf) is proportional to the theoretical diffusion-controlled value (k*D) over a range of temperatures
已通过微波温度跳跃装置测定了碘与一些通式为R 2 CS的化合物与碘(R 2 CS = I-I)的碘的电子供体-电子受体配合物的形成速率。对于这些反应中的每一个,在一定温度范围内观察到的正向速率常数(k f)与理论扩散控制值(k * D)成正比,但略小一些。各种反应的k f / k * D值与R 2的估计表面积大致成反比CS分子。假设反应性位点的面积是恒定的,这表明ķ ˚F / ķ * d正比于分子表面面积的分数是反应性的,即该ķ ˚F是受a几何立体因素。然而,k f / k * D的观测值为。如果仅考虑具有正确方向的反应物分子之间首次碰撞的频率,则该分子比基于该模型的分子模型所预期的分子大小大四倍。可以通过考虑以下事实来消除这种差异:在相遇过程中反复发生碰撞会增加成功碰撞的机会。具有有限反应位点的分子之间相遇的硬球模型,通过碰撞之间的旋转而重新定向,这表明重复的碰撞可能会导致k f / k
[EN] CARBON DIOXIDE ABSORBENT AND METHOD OF USING THE SAME<br/>[FR] ABSORBANT DE DIOXYDE DE CARBONE ET SON PROCÉDÉ D'UTILISATION
申请人:GEN ELECTRIC
公开号:WO2011014273A1
公开(公告)日:2011-02-03
In accordance with one aspect, the present invention provides an amino-siloxane composition comprising at least one of structures I, II, III, IV or V said compositions being useful for the capture of carbon dioxide from gas streams such as power plant flue gases. In addition, the present invention provides methods of preparing the amino-siloxane compositions are provided. Also provided are methods for reducing the amount of carbon dioxide in a process stream employing the amino-siloxane compositions of the invention as species which react with carbon dioxide to form an adduct with carbon dioxide. The reaction of the amino-siloxane compositions provided by the present invention with carbon dioxide is reversible and thus, the method provides for multicycle use of said compositions.
Chemical polymerization initiator, adhesive composition, adhesive composition kit, dental material, dental material kit, and method of storing adhesive composition
申请人:TOKUYAMA DENTAL CORPORATION
公开号:US11325993B2
公开(公告)日:2022-05-10
Provided are a chemical polymerization initiator including (a) a thiourea compound, (b) a peroxyester, (c) a divalent copper compound, and (d) an aryl borate compound, an adhesive composition, an adhesive composition kit, a dental material, and a dental material kit each using the chemical polymerization initiator, and a method of storing the adhesive composition.