Negishi's Reagent Versus Rosenthal's Reagent in the Formation of Zirconacyclopentadienes
作者:Sara Urrego‐Riveros、Isabel‐Maria Ramirez y Medina、Daniel Duvinage、Enno Lork、Frank D. Sönnichsen、Anne Staubitz
DOI:10.1002/chem.201902255
日期:2019.10.17
accessible by Zr‐element exchange reactions. The vast majority of reports describe their preparation by the use of Negishi′s reagent, which is a species that is formed in situ. The zirconacyclopentadiene is then formed by the addition of one equivalent of a diyne or two equivalents of a monoyne moiety to this Negishi species. Another route involves Rosenthal′s reagent (Cp2Zr(py)Me3SiC≡CSiMe3), which
The reaction of bulky alkynes C2R2 with (η5-C5H5)Co(CO)(dimethyl fumarate) under microwave irradiation provides complexes of the type [(η4-C4R4)Co(η5-C5H5)] in good to excellent yields. This protocol represents a significant improvement over those reported previously. In particular, the formation of insertion products such as cyclopentadienones or cyclohexadienes can be avoided. In addition, because
笨重炔C的反应2 - [R 2与(η 5 -C 5 H ^ 5)的Co(CO)(富马酸二甲酯)在微波辐射下提供了式[(η的络合物4 -C 4 - [R 4)的Co(η 5 - C 5 H 5)],收率良好。该协议表示对以前报告的协议的重大改进。特别地,可以避免形成插入产物,例如环戊二烯酮或环己二烯。此外,由于特殊的稳定性(的η 5 -C 5 H ^ 5)Co(CO)(富马酸二甲酯),反应可在粗溶剂中进行。容易进入[(η 4 -C 4 - [R 4)的Co(η 5 -C 5 H ^ 5)]配合物刺激的反应性的研究,特别是交叉偶联条件下进行。
Reaction of Zirconocene Ethylene Complex with Diynes. Formation of Bridged Zirconacyclopentenes
Reactions of diynes RCC-X-CCR with zirconocene ethylene complex Cp2Zr(CH2=CH2) were investigated. When X was C6H4 or C4H2S, bridged zirconacyclopentenes were selectively formed. They were easily converted into bridged cyclopentenone derivatives. In the case of (CH2)n groups as X, the reaction products were strongly dependent on the R group.
研究了二炔类化合物 RCC-X-CCR 与二茂锆乙烯络合物 Cp2Zr(CH2=CH2) 的反应。当 X 为 C6H4 或 C4H2S 时,选择性地形成了桥接的锆环戊烯。它们很容易转化为桥式环戊烯酮衍生物。当 X 为 (CH2)n 基团时,反应产物在很大程度上取决于 R 基团。
Tuning Emission Color and Efficiency of 1,2,5-Triaryl-3,4-cycloalka[<i>c</i>]arsoles
作者:Suzuka Iwasaki、Hiroaki Imoto、Kensuke Naka
DOI:10.1246/bcsj.20230006
日期:2023.3.15
color and efficiency. Notably, the cyclopentane-fused arsole showed aggregation-caused quenching (ACQ) in the solid state, while cyclohexane and cycloheptane offered aggregation-induced emission enhancement (AIEE). This trend was also seen in heterocycle-fused arsoles; five- and six-membered rings offered ACQ and AIEE, respectively. The p-(dimethylamino)phenyl and p-(dimesitylboryl)phenyl groups at the