Room Temperature Stable Organocuprate Copper(III) Complex
作者:Steven F. Hannigan、June S. Lum、Jeffrey W. Bacon、Curtis Moore、James A. Golen、Arnold L. Rheingold、Linda H. Doerrer
DOI:10.1021/om4000538
日期:2013.6.24
complexes K(18C6)}[CuII(OC(CH3)(CF3)2)3] (2) and K[CuII(OC(C6H5)(CF3)2)3] (3) have been prepared and characterized, including X-ray crystallography, in 61% and 3% yields, respectively. The latter complex does not form preferentially, because CuBr2 and KOC(C6H5)(CF3)2)3 also form the diamagnetic complexes K(18C6)}[K2CuI(OC(C6H5)(CF3)2)2}3] (4) and K(18C6)}[CuIII(OC(C6H4)(CF3)2)2] (5). These species were
顺磁性三角平面铜络合物K(18C6)} [Cu II(OC(CH 3)(CF 3)2)3 ](2)和K [Cu II(OC(C 6 H 5)(CF 3)2)3 ](3)的制备和表征(包括X射线晶体学)分别达到61%和3%的收率。后者的络合物不会优先形成,因为CuBr 2和KOC(C 6 H 5)(CF 3)2)3也形成了抗磁性配合物K(18C6)} [K 2 Cu I(OC(C 6 H 5)(CF 3)2)2 } 3 ](4)和K(18C6)} [Cu III(OC (C 6 H 4)(CF 3)2)2 ](5)。这些物质的特征在于X射线晶体学,紫外可见光谱,1 H,13 C 1 H}和19 F 11 H NMR光谱法和元素分析。通过两个苯环的邻位金属化形成具有O 2 C 2 }配位的独特有机铜Cu(III)物种,导致Cu(III)的反式-O 2 C 2 }配位,并且在室温下稳定THF的固态和深色溶液。
Studies on Molybdena- and Tungstenacyclobutadiene Complexes Supported by Fluoroalkoxy Ligands as Intermediates of Alkyne Metathesis
作者:Henrike Ehrhorn、Dirk Bockfeld、Matthias Freytag、Thomas Bannenberg、Christos E. Kefalidis、Laurent Maron、Matthias Tamm
DOI:10.1021/acs.organomet.9b00068
日期:2019.4.8
The molybdenum and tungsten 2,4,6-trimethylbenzylidynes [MesC≡MOC(CF3)2Ph}3] (12a, M = Mo; 12b, M = W) were prepared and structurally characterized as relatedcomplexes to already known [MesC≡MOC(CF3)2Me}3] (MoF6, M = Mo; WF6, M = W). While treatment of 12a with 3-hexyne yielded the propylidyne complex [EtC≡MoOC(CF3)2Ph}3] (13), the tungsten congener 12b formed isolable metallacyclobutadiene (MCBD)
Ligand Variations in Neutral and Cationic Molybdenum Alkylidyne NHC Catalysts
作者:Jonas Groos、Maximilian Koy、Janis Musso、Michael Neuwirt、Thao Pham、Philipp M. Hauser、Wolfgang Frey、Michael R. Buchmeiser
DOI:10.1021/acs.organomet.2c00080
日期:2022.5.23
synthesized, boasting the structure proposed for the active species of molybdenum alkylidyne NHC complexes in alkyne metathesis reactions. The formation of unanticipated structures such as a bis-NHC complex (Mo19) and a complex bearing an alkoxide (Mo16) as a result of the demethylation of 1,2-dimethoxyethane (DME) was observed. The crystal structures of selected complexes are presented. Notably, this work focused