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。
Metal Complexes of Biologically Important Ligands, XCl. Introduction of Organometallic Fragments into α-Amino Acids by Reactions of α-Bromoglycine Derivatives with Anionic Organotransition-Metal Compounds
The reactions of protected α-bromoglycine esters R1(O)CNHCH(Br)CO2R2 (R1Ph, OCMe3; R2 Me, tBu) with organometallic anions of acetylferrocene, CpFe(CO)(PPh3)-C(O)CH3, (OC)5MC(OMe)CH3 (MCr, W), (OC)3Cr(η6-diphenylmethane), (OC)3Cr[η6-fluorene), (OC)3Cr(η6-dihydroanthracene) and of (OC)3Cr(-η6aniline) and (OC)3Cr(η6-o-toluidine) provide a method for the introduction of organometallicfragments into the
受保护的α-溴甘氨酸酯R 1(O)CNHCH(Br)CO 2 R 2(R 1 Ph,OCMe 3 ; R 2 Me,t Bu)与乙酰基二茂铁,CpFe(CO)(PPh 3)的有机金属阴离子的反应-C(O)CH 3,(OC)5 MC(OME)CH 3(MCR,W),(OC)3铬(η 6 -二苯基甲烷),(OC)3铬[ η 6 -芴),(OC )3铬(η 6 -dihydroanthracene)和(OC)的3铬( - η 6苯胺)和(OC)3铬(η 6 - ö甲苯胺)提供用于引入有机金属片段的成α-个氨基酸,复合物的侧链可以是如在肽α氨基酸标记是有用的方法。通过X射线衍射对化合物(OC))3 Cr(η - o -C 6 H 4(CH 3)NHC-(H)(CO 2 Me)NHC(O)Ph进行表征。
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
Cationic organometallic complexes with hexaalkylborazines
作者:M. Scotti、M. Valderrama、R. Ganz、H. Werner
DOI:10.1016/0022-328x(85)80053-x
日期:1985.5
The PF6 salts of the new cationic hexamethylborazinerhodium(I) complexes of general formula [Rh(Me3B3N3Me3)(LL′)]+ (LL′= 1,5-cyclooctadiene, norbornadiene, tetrafluorobenzobarrelene, trimethyltetrafluorobenzobarrelene, L = L′ = ethylene, CO) have been prepared from the reaction between [RhCl(LL′)]2, Me3B3NMe3, and AgPF6 in dichloromethane. These complexes are very labile, undergoing rapid ring ligand
Palladium-Catalyzed Allylic Substitution with (η<sup>6</sup>-Arene–CH<sub>2</sub>Z)Cr(CO)<sub>3</sub>-Based Nucleophiles
作者:Jiadi Zhang、Corneliu Stanciu、Beibei Wang、Mahmud M. Hussain、Chao-Shan Da、Patrick J. Carroll、Spencer D. Dreher、Patrick J. Walsh
DOI:10.1021/ja208935u
日期:2011.12.21
Although the palladium-catalyzed Tsuji-Trost allylic substitution reaction has been intensively studied, there is a lack of general methods to employ simple benzylic nucleophiles. Such a method would facilitate access to "α-2-propenyl benzyl" motifs, which are common structural motifs in bioactive compounds and natural products. We report herein the palladium-catalyzedallylationreaction of toluene-derived