Echange d'arene de (trans-propenylbenzo)-Cr(CO) 3 : 参与内部和分子间的取代基丙烯基。La geometrie de l'hydrocarbure insature Impact le movement de Cr(CO) 3
DOI:
10.1021/ja00282a023
作为产物:
描述:
(C6H5Me)Cr(CO)(η2-H2) 在
CO 作用下,
以
further solvent(s) 为溶剂,
生成 (甲苯)三羰基铬
参考文献:
名称:
Organometallic chemistry in supercritical fluids. The generation and detection of dinitrogen and nonclassical dihydrogen complexes of Group 6, 7, and 8 transition metals at room temperature
Accelerated Arene Ligand Exchange in the (Arene)Cr(CO)<sub>2</sub>L Series
作者:M. F. Semmelhack、Anatoly Chlenov、Douglas M. Ho
DOI:10.1021/ja042705x
日期:2005.6.1
(eta(6)-arene)Cr(CO)(2)L series can be accelerated if the ligand L is an electronically unsymmetricalbidentate ligand. The system evaluated here employs derivatives of tris(pyrrolyl)phosphine as L. A series of 2-L'-substituted pyrroles was prepared, where the substituents include: L' = -SMe, -CH(2)SMe, -SPh, -CH(2)SPh, -SCF(3), -S-tBu, -CO(2)Me, -CONMe(2), -2-pyridinyl, and -PPh(2). Reaction with ClP(pyrrolyl)(2)
如果配体 L 是电子不对称的双齿配体,则可以加速 (eta(6)-芳烃)Cr(CO)(2)L 系列中的芳烃配体交换。此处评估的系统采用三(吡咯基)膦的衍生物作为 L。制备了一系列 2-L'-取代的吡咯,其中取代基包括:L' = -SMe、-CH(2)SMe、-SPh、- CH(2)SPh、-SCF(3)、-S-tBu、-CO(2)Me、-CONMe(2)、-2-吡啶基和-PPh(2)。与 ClP(pyrrolyl)(2) 反应得到一系列新的膦,(2-L'-pyrrolyl)(pyrrolyl)(2)P。这些膦中的每一种都转化为(芳烃)Cr(CO)(2)[P(2-L'-吡咯基)(吡咯基)(2)P)配合物。建议取代基 L' 为 Cr 提供临时配位并降低芳烃交换的障碍。该系列被评估,其中配合物(离开)中的芳烃是苯、氟苯、甲苯、邻二甲苯、间二甲苯或对二甲苯,进入的芳烃为 C(6)D(6)、氯苯-d
π-Arene complexes
作者:Simon Lotz、Minet Schindehutte、Marthie M. van Dyk、Jan L.M. Dillen、Petrus H. van Rooyen
DOI:10.1016/0022-328x(85)88072-4
日期:1985.11
A carbonyl ligand of π-arenetricarbonylchromiun(0) complexes is photochemically displaced to give π-arenedicarbonyl complexes of chromium(0) with thio-ether ligands. In contrast, irradiation of π-arenetricarbonylchromium compounds with dithio-ester and trithiocarbonate ligands yields only pentacarbonyl complexes. Substitution of the π-arene ring, the thio-ether ligand, or both, is easily achieved at
been measured for the α-metallation of some arylmethanes, of 5H-dibenzo[a,d]cycloheptene and its dihydro derivative, free and complexed with tricarbonylchromium, by potassium hydride in tetrahydrofuran in the presence of 18-crown-6 ether. The stable solutions of the complexed anions have been studied by 13C NMR spectroscopy. With the free ligands the kinetic acidity depends upon the structure to a
在18-crown-6存在下,通过氢化钾在四氢呋喃中测量了一些芳基甲烷,5 H-二苯并[ a,d ]环庚烯及其二氢衍生物(与三羰基铬络合)的α-金属化速率常数。醚。通过13 C NMR光谱研究了络合阴离子的稳定溶液。对于游离配体,动力学酸度在很大程度上取决于结构,但是在相应的配合物中,金属化的速率没有明显变化。根据13 C化学位移数据,建议在芳基甲基和二苯并噻吩基阴离子的电子结构之间存在相似性,这将说明它们的金属化速率非常相似。
Raising the p<i>K</i><sub>a</sub> Limit of “Soft” Nucleophiles in Palladium-Catalyzed Allylic Substitutions: Application of Diarylmethane Pronucleophiles
作者:Sheng-Chun Sha、Jiadi Zhang、Patrick J. Carroll、Patrick J. Walsh
DOI:10.1021/ja409511n
日期:2013.11.20
Tsuji-Trost allylicsubstitution reaction provides a useful and efficient approach to construct C-C bonds between sp(3)-hybridized carbons. The widely accepted paradigm for classifying the mode of attack of nucleophiles on palladium π-allyl intermediates in the Tsuji-Trost reaction is based on the pKa of the pronucleophile: (1) stabilized or "soft" carbonnucleophiles and heteroatom nucleophiles (e.g.,
Benzylic functionalization of (η6-alkylarene)chromium tricarbonyl complexes
作者:Valery N. Kalinin、Il'ya A. Cherepanov、Sergey K. Moiseev
DOI:10.1016/s0022-328x(96)06781-2
日期:1997.5
(η6-alkylarene)chromiumtricarbonylcomplexes on the action of lithium amides in THF under very mild conditions has been developed. Transmetallation reactions of the lithium derivatives thus obtained produce the corresponding benzylic organotin, zinc and copper chromiumtricarbonylcomplexes. Methods for the preparative benzylic functionalization of (η6-alkylarene)chromiumtricarbonylcomplexes have been