The mono- and bis-tetrabutylammonium salts of 2-ethyl-spirobifluorene monophosphonate and (+/-) 2,2'-diethyl-7,7'-didodecyloxy-spirobifluorene diphosphonate respectively, were synthesized and shown to bind strongly to a series of 1-O-octylglycosides in CD3CN. (C) 1997 Elsevier Science Ltd.
Selective Functionalization of Arenes through the Reaction of Aryne-Zirconocene Complexes and Enol Ethers
作者:José Barluenga、Amadeo Fernández、Lucía Álvarez-Rodrigo、Félix Rodríguez、Francisco J. Fañanás
DOI:10.1055/s-2005-872699
日期:——
A new method for the selective functionalization of aromatic rings by the zirconium promoted cross coupling reaction of an aryllithium compound and an enol ether is reported. Formation of an aryne-zirconocene complex and its regioselective coupling with an enol ether are the key steps of the process. This methodology allows the synthesis of functionalized styrene or Z-alkenol derivatives from simple
Secondary phosphineoxides were synthesized using a two-step procedure: a basic hydrolysis of oxazaphospholidine SP-2 to form the secondary phosphinate RP-4, followed by the stereoselective nucleophilic attack of organometallic reagents to obtain the expected enantioenriched secondary phosphineoxides.
次级膦氧化物的合成过程分两步进行:将氧杂氮磷吡啶S P -2进行碱性水解以形成次级次膦酸酯R P -4,然后对有机金属试剂进行立体选择性亲核攻击,从而获得预期的对映体富集的次级膦氧化物。
Pentaorganyle des antimons
作者:D. Hellwinkel、M. Bach
DOI:10.1016/s0022-328x(00)88225-x
日期:1969.6
Some new spirocycles of pentacoordinated antimony are described. By means of the temperature-dependent proton-resonance spectra of the antimony penta- organyls (XXXV) and (XXXVI) conclusions concerning the dynamic stereochemistry of these derivatives are possible. The cyclic stibines, essential for the synthesis of the pentavalent antimony derivatives, are prepared by a new method with the aid of bidentate
olefinic C-H bonds with 2-aminophenylboranes. Computational and experimentalstudies reveal that the metal-free C-H insertion proceeds via a frustrated Lewis pair mechanism involving heterolytic splitting of the C-H bond by cooperative action of the amine and boryl groups. The adapted geometry of the reactive B and N centers results in an unprecedentently low kinetic barrier for both insertion into the