1,2,3,4-Tetramethyl-5-(trifluoromethyl)cyclopentadienide: a unique ligand with the steric properties of pentamethylcyclopentadienide and the electronic properties of cyclopentadienide
1,2,3,4-Tetramethyl-5-(trifluoromethyl)cyclopentadienide: a unique ligand with the steric properties of pentamethylcyclopentadienide and the electronic properties of cyclopentadienide
Ruthenium-Catalyzed Cycloadditions of 1-Haloalkynes with Nitrile Oxides and Organic Azides: Synthesis of 4-Haloisoxazoles and 5-Halotriazoles
作者:James S. Oakdale、Rakesh K. Sit、Valery V. Fokin
DOI:10.1002/chem.201402559
日期:2014.8.25
(Cyclopentadienyl)(cyclooctadiene) ruthenium(II) chloride [CpRuCl(cod)] catalyzes the reaction between nitrileoxides and electronically deficient 1‐choro‐, 1‐bromo‐, and 1‐iodoalkynes leading to 4‐haloisoxazoles. Organicazides are also suitable 1,3‐dipoles, resulting in 5‐halo‐1,2,3‐triazoles. These air‐tolerant reactions can be performed at room temperature with 1.25 equivalents of the respective
(环戊二烯基)(环辛二烯)氯化钌(II)[CpRuCl(cod)] 催化腈氧化物与电子缺陷的 1-氯-、1-溴-和 1-碘炔之间的反应,生成 4-卤代异恶唑。有机叠氮化物也是合适的 1,3-偶极子,产生 5-卤代-1,2,3-三唑。这些耐空气反应可以在室温下进行,相对于炔烃组分,相应的 1,3-偶极子为 1.25 当量。反应性 1-卤代炔烃包括丙炔酰胺、酯、酮和膦酸酯。卤化唑类产物的后官能化可以通过钯催化的交叉偶联反应和活性酰胺基团的操作来实现。用 [Cp*RuCl(cod)](Cp*=五甲基环戊二烯基)观察到的催化缺乏归因于 Cp* 的空间需求(η 5 ‐C 5 Me 5 ) 配体与母体 Cp ( η 5 ‐C 5 H 5 ) 相比。[( η 5 ‐C 5 Me 4 CF 3 )RuCl(cod)]的低反应性支持了这一假设,它作为 Cp* 的等排模拟物和 Cp 的等电子类似物。
Rh(III)-Catalyzed C–H Activation-Initiated Directed Cyclopropanation of Allylic Alcohols
作者:Erik J. T. Phipps、Tomislav Rovis
DOI:10.1021/jacs.9b02156
日期:2019.5.1
annulation onto allylic alcohols initiated by alkenyl C-H activation of N-enoxyphthalimides to furnish substituted cyclopropyl-ketones. Notably, the traceless oxyphthalimide handle serves three functions: directing C-H activation, oxidation of Rh(III), and, collectively with the allylic alcohol, in directing cyclopropanation to control diastereoselectivity. Allylic alcohols are shown to be highly reactive
Synthesis of platinum complexes with η4-C5Me4(CF3)H ligand. X-ray structure of [Pt(η4-C5Me4H2)Cl2] and [Pt{η4-C5Me4(CF3)H}(η5-C5H5)]PF6
作者:Oleg V. Gusev、Tat'yana A. Peganova、Mikhail A. Ievlev、Anna G. Kropotova、Konstantin A. Lyssenko、Pavel V. Petrovskii、Yuri F. Oprunenko、Nikolai A. Ustynyuk
DOI:10.1016/s0022-328x(00)00924-4
日期:2001.3
were studied. Crystalstructure of complex [Ptη4-C5Me4(CF3)H}(η5-C5H5)]PF6 (3) resulted from the reaction with cyclopentadiene was determined. When C5Me4(CF3)H is used the reaction yields [Ptη4-C5Me4(CF3)H}η5-C5Me4(CF3)}]BF4 (4) unstable in solutions. Reaction with pentamethylcyclopentadiene led to complex [Pt(η4-C5Me5H)(η5-C5Me5)]BF4 (5) and no complexes with CF3 containingligands were obtained
用蔡斯盐二聚体1,2,3,4-四甲基-5-(三氟甲基)环戊二烯的异构体混合物的反应,得到异构体只有[PT η 4 -C 5我4(CF 3)H}氯2 ](1)带有CF 3基外切成的sp 3碳原子的产率高。试图制备1用K的反应2氯铂酸4为C 5我4(CF 3)H用二氯化锡的盐酸溶液作为催化剂出人意料地导致了形成的[PT(η 4 -C 5我4 H 2)Cl 2 ](2)。给出了化合物2的X射线结构。1在三种不同的环戊二烯C 5 R 1 4(R 2)H(R 1 = R 2 = H; R 1 = R 2 = Me; R 1 = Me,R 2 = CF 3的存在下)与AgBF 4的反应)进行了研究。配合物[Pt中的晶体结构η 4 -C 5我4(CF 3)H}(η 5 -C 5测定了与环戊二烯反应产生的H 5)] PF 6(3)。当C 5我4(CF 3)H是所用的反应产率[PT η 4 -C 5我4(CF
Syntheses, Properties, and X-ray Crystal Structures of Iron and Ruthenium Compounds with the η<sup>5</sup>-C<sub>5</sub>Me<sub>4</sub>CF<sub>3</sub> Ligand. Compounds of the Type [(η<sup>5</sup>-C<sub>5</sub>Me<sub>4</sub>CF<sub>3</sub>)M(μ-CO)(CO)]<sub>2</sub> (M = Fe, Ru)
作者:Luis P. Barthel-Rosa、John R. Sowa,、Paul G. Gassman、Jean Fischer、Bayrn M. McCarty、Seth L. Goldsmith、Michael T. Gibson、John H. Nelson
DOI:10.1021/om961069b
日期:1997.4.1
[(η5-C5Me4CF3)Ru(CO)(PPh3)(I)] (4). The HC5Me4CF3 ligand reacts with Fe(CO)5 in refluxing heptane to produce [(η4-HC5Me4CF3)Fe(CO)3] (5). Compound 5 represents a new mode of coordination (η4) for HC5Me4CF3. The spectroscopic properties of compound 1 and its previously reported iron analog, [(η5-C5Me4CF3)Fe(μ-CO)(CO)]2 (2), are compared with those of their η5-C5H5 and η5-C5Me5 “parent” analogs of the type [(η5-C5R5)M(μ-CO)(CO)]2
Verfahren zur Copolymerisation von konjugierten Diolefinen (Dienen) und vinylaromatischen Monomeren mit Katalysatoren der Seltenen Erden sowie die Verwendung der Copolymerisate in Kautschukmischungen für Reifenanwendungen
申请人:BAYER AG
公开号:EP1078939A2
公开(公告)日:2001-02-28
Die vorliegende Erfindung betrifft ein Verfahren zur Copolymerisation von konjugierten Diolefinen und vinylaromatischen Monomeren in Gegenwart von Katalysatoren der Seltenen Erden sowie die Verwendung der Copolymerisate in Kautschukmischungen für Reifenanwendungen.