The reactivity of phosphate esters. Reactions of diesters with nucleophiles
作者:A. J. Kirby、M. Younas
DOI:10.1039/j29700001165
日期:——
The reactions of a wide range of nucleophiles with a series of aryl methyl phosphate ester anions involve concerted nucleophilic displacement at phosphorus. The attack of neutral nucleophiles is slower than the corresponding reactions of both triesters and monoester monoanions. SN2(P) reactions involving the attack of anions on phosphate diester anions are observed, and are shown to be retarded by
多种亲核试剂与一系列芳基甲基磷酸酯阴离子的反应涉及在磷处的协同亲核取代。中性亲核试剂的进攻要比三酯和单酯单阴离子的相应反应慢。观察到涉及阴离子对磷酸二酯阴离子的攻击的S N 2(P)反应,并且显示出受阻约两倍。速率为100倍,这归因于不良的静电作用。对亲核试剂和离去基团的敏感性都很高,并且对反应性有一定的依赖性:它们显然也受到静电作用的影响。
BrettPhos Ligand Supported Palladium-Catalyzed CO Bond Formation through an Electronic Pathway of Reductive Elimination: Fluoroalkoxylation of Activated Aryl Halides
作者:T. M. Rangarajan、Rajendra Singh、Raju Brahma、Kavita Devi、Rishi Pal Singh、R. P. Singh、Ashok K. Prasad
DOI:10.1002/chem.201404121
日期:2014.10.27
supported Pd‐catalyzed CO bond‐forming reaction of activatedaryl halides with primary fluoroalkyl alcohols. We demonstrate that the Phosphine ligand (BrettPhos) possesses the property of altering the mechanistic pathway of reductive elimination from nucleophile to nucleophile. The Pd/BrettPhos catalyst system facilitates the reductive elimination of the oxygen nucleophile through an electronic pathway
Bicyclic androgen and progesterone receptor modulator compounds and methods
申请人:Zhi Lin
公开号:US20050288350A1
公开(公告)日:2005-12-29
The present invention is directed to compounds, pharmaceutical compositions, and methods for modulating processes mediated by AR and PR. More particularly, the invention relates to nonsteroidal compounds and compositions that are high affinity, high specificity agonists, partial agonists (i.e., partial activators and/or tissue-specific activators) and antagonists for AR and PR. Also provided are methods of making such compounds and pharmaceutical compositions, as well as critical intermediates used in their synthesis.
1,3-Diamino-4-(2',2',2',-trifluoroethoxy)-benzene, method of producing
申请人:Wella AG
公开号:US04543425A1
公开(公告)日:1985-09-24
1,3-diamino-4-(2',2',2'-trifluoroethoxy)-benzene, as well as its acid addition salts, are used as new compounds to serve as coupler substance in hair dyeing compositions and yields with known developer substances 1,4-diaminobenzene and 2,5-diaminobenzylalcohol to stable blue tones without any red fraction. Moreover, the new compounds lead to exceptional black tones and ash tones.