[EN] N-substituted pyridiniophosphines, processes for their preparation and their use<br/>[FR] PYRIDINIOPHOSPHINES N-SUBSTITUÉES, LEURS PROCÉDÉS DE PRÉPARATION ET LEUR UTILISATION
申请人:STUDIENGESELLSCHAFT KOHLE MBH
公开号:WO2015165781A1
公开(公告)日:2015-11-05
The present invention deals with the synthesis and applications of new cationic compounds being useful as metal ligands. Specifically, N-alkyl/aryl substituted pyridiniophosphines are prepared and used as ligands for transition metals. The so- obtained metal complexes and their use as catalysts in chemical synthesis is also described. It also worth to mention that N-alkyl/aryl pyridiniophosphines can be synthesized through a short, scalable and highly modular route.
A new family of cationic ligands, N‐alkyl/aryl pyridiniophosphines, has been synthesized through a short, scalable, and highly modularroute. Evaluation of their electronic properties evidenced weak σ‐donor and quite strong π‐acceptor character when used as ancillary ligands. These attributes confer a substantially enhanced π‐acidity to the PtII and AuI complexes thereof derived and, as result, they
Use of Tunable Ligands Allows for Intermolecular Pd-Catalyzed C−O Bond Formation
作者:Andrei V. Vorogushin、Xiaohua Huang、Stephen L. Buchwald
DOI:10.1021/ja050471r
日期:2005.6.1
Pd-catalyzed C-O coupling reactions of aryl halides with primary and secondary alcohols by promoting reductive elimination at the expense of beta-hydride elimination. The key to their success is the ability to match the size of the ligand to that of the combination of substrates. The efficient coupling of a number of unactivated aryl chlorides and bromides with cyclic and acyclicsecondary alcohols was achieved
庞大的联芳基膦配体通过促进还原消除以消除 β-氢化物为代价,促进了 Pd 催化的芳基卤化物与伯醇和仲醇的 CO 偶联反应。它们成功的关键是能够将配体的大小与底物组合的大小相匹配。实现了许多未活化的芳基氯化物和溴化物与环状和非环状仲醇的有效偶联。这包括首次在 Pd 催化的偶联过程中偶联烯丙醇。
Thermische Umlagerungen von halogensubstituierten Aryl-propargyläthern
作者:Nada Šarčevic̀、Janos Zsindely、Hans Schmid
DOI:10.1002/hlca.19730560502
日期:1973.7.18
7-Chloro-2-chloromethyl-benzofuran (13) and 3, 8-dichloro-2 H-1-benzopyran (12) are the main products from the thermal rearrangement (230–260°) of 2, 6-dichlorophenyl propargyl ether (7). Compounds 17, 18 and 19 are also formed, but in much smaller amounts (scheme 2 and table 1). However, in the case of the bromo-compounds 8 and 9 the rearrangement products are the benzofuran derivatives 21 and 22
7-氯-2-氯甲基苯并呋喃(13)和3,8-二氯2 H -1-苯并吡喃(12)是2,6-二氯苯基炔丙基醚的热重排(230-260°)的主要产物(7)。化合物17,18和19也被形成,但在更小的量(方案2和表1)。然而,在溴化合物8和9的情况下,重排产物是苯并呋喃衍生物21和22,其每分子少含一个溴原子(方案4)。
Unmasking the Catalytic Activity of a Platinum Complex with a Lewis Acidic, Non-innocent Antimony Ligand
作者:Di You、François P. Gabbaï
DOI:10.1021/jacs.7b03287
日期:2017.5.24
salt. Formation of [3]2+ occurs through abstraction of the platinum-bound chloride ligand by the adjacent Lewis acidic antimony center. This halide migration reaction leads to activation of the platinum center. In turn, 2 behaves as a self-activating catalyst in reactions involving alkynes and readily mediates both enyne cyclization and intramolecularhydroarylation reactions, at room temperature,
考虑到开发自活化亲电催化剂,我们现在正在研究在过渡金属中心附近具有路易斯酸性部分的配合物。为此,我们合成了一种铂络合物,其中的金属与路易斯酸性双(三氟甲磺酸)stiboranyl配体相连。通过处理((o-(Ph 2 P)C 6 H 4)2 SbCl 2)获得的((o-(Ph 2 P)C 6 H 4)2 SbOTf 2)PtCl(2)络合物氯化铂(1)具有2当量的AgOTf,具有令人惊讶的空气稳定性。然而,它立即与环己基异氰化物反应,生成呈双三氟甲磺酸盐形式的二氯三乙胺络合物[((o-(Ph 2 P)C 6 H 4)2 SbCl)PtCNCy] 2 +([ 3 ] 2+)。[ 3 ] 2+的形成是通过相邻的路易斯酸性锑中心提取铂结合的氯化物配体而发生的。该卤化物迁移反应导致铂中心的活化。反过来2在涉及炔烃的反应中起着自活化催化剂的作用,并且在不添加氯化物提取剂的情况下,在室温下容易介导烯炔环