Molybdenum Imido Alkylidene Complexes that Contain a β-Diketiminate Ligand
作者:Zachary J. Tonzetich、Annie J. Jiang、Richard R. Schrock、Peter Müller
DOI:10.1021/om7003207
日期:2007.7.1
The molybdenum β-diketiminate complexes Mo(NR)(CHCMe2R‘)(Ar-nacnac)(OTf) (R = 2,6-diisopropylphenyl, 2,6-dimethylphenyl, 1-adamantyl, 2,6-dichlorophenyl, or 2-tert-butylphenyl; Ar = 2,6-dichlorophenyl, 2,6-dimethylphenyl, 3,5-dimethylphenyl, or 2,6-difluorophenyl; R‘ = Me or Ph; Ar-nacnac = [ArNC(Me)]2CH; OTf = trifluoromethanesulfonate) have been prepared from Mo(NR)(CHCMe2R‘)(OTf)2(DME) by metathesis
β-二酮钼配合物Mo(NR)(CHCMe 2 R')(Ar-nacnac)(OTf)(R = 2,6-二异丙基苯基,2,6-二甲基苯基,1-金刚烷基,2,6-二氯苯基或2-叔丁基苯基; Ar = 2,6-二氯苯基,2,6-二甲基苯基,3,5-二甲基苯基或2,6-二氟苯基; R'= Me或Ph; Ar-nacnac = [ArNC(Me)]通过与相应的Li Ar-nacnac}盐复分解,由Mo(NR)(CHCMe 2 R')(OTf)2(DME)制备2 CH; OTf =三氟甲磺酸盐。Mo(NR)(CHCMe 2 R')(Ar-nacnac)(OTf)与NaBAr f4(Ar f = 3,5-(CF 3)2 C 6 H 3)存在或不存在THF的情况下,根据Ar的性质,可提供阳离子物种Mo(NR)(CHCMe 2 R')(Ar-nacnac)(THF)n } BAr f4 }(n = 0或1)
C–H Activation and Proton Transfer Initiate Alkene Metathesis Activity of the Tungsten(IV)–Oxo Complex
allylic CH group in the alkene reactant is crucial for initiating alkene metathesis. Deuterium labeling of the allylic C-H group shows a primary kinetic isotope effect on the rate of initiation. DFT calculations support the formation of an allyl hydride intermediate via activation of the allylic C-H bond and show that formation of the metallacyclobutane from the allyl "hydride" involves a proton transfer
Synthesis of Rhenium Complexes That Contain the [(C<sub>6</sub>F<sub>5</sub>NCH<sub>2</sub>CH<sub>2</sub>)<sub>3</sub>N]<sup>3</sup><sup>-</sup> Ligand
作者:Steven M. Reid、Brigitte Neuner、Richard R. Schrock、William M. Davis
DOI:10.1021/om980220+
日期:1998.8.1
The reaction between [Et4N]2[ReOCl5] and (C6F5NHCH2CH2)3N (H3[N3NF]) in CH3CN at room temperature in the presence of NEt3 yielded air stable, emerald green, diamagnetic [(C6F5NCH2CH2)2NCH2CH2NHC6F5]Re(O)Cl (1). The reaction between 1 and Ta(CH-t-Bu)(THF)2Br3 gave paramagnetic [N3NF]ReBr (2). An X-ray structure of a sample of 2 showed it to be analogous to that of [N3NF]MoCl. Reduction of 2 by methyllithium
在室温下在NEt 3存在下,[Et 4 N] 2 [ReOCl 5 ]与(C 6 F 5 NHCH 2 CH 2)3 N(H 3 [N 3 N F ])在CH 3 CN中的反应产生空气稳定,翠绿色,抗磁性[(C 6 F 5 NCH 2 CH 2)2 NCH 2 CH 2 NHC 6 F 5 ] Re(O)Cl(1)。1之间的反应和Ta(CH-t-Bu)(THF)2 Br 3给出顺磁性的[N 3 N F ] ReBr(2)。2样品的X射线结构表明它与[N 3 N F ] MoCl相似。在各种双电子配体的存在下,通过甲基锂(或更方便地通过Mg)还原2得到[N 3 N F ] Re(L)类型的配合物(L = H 2,乙烯,丙烯,CO, N 2,膦,吡啶,四氢噻吩,乙腈或硅烷)。[N 3 N F ] Re(乙烯)的X射线结构显示为η2-乙烯以其C-C轴位于N ax -Re-N eq平面之一中的方式结合在顶端的“口袋”中。PMe
ATP-Independent Formation of Hydrocarbons Catalyzed by Isolated Nitrogenase Cofactors
作者:Chi Chung Lee、Yilin Hu、Markus W. Ribbe
DOI:10.1002/anie.201108916
日期:2012.2.20
Reduce to produce: Molybdenum‐ and vanadium‐nitrogenasecofactors have been isolated and shown to reduce carbon monoxide and cyanide ions to a mixture of alkanes and alkenes in the presence of a strong reductant, europium(II) diethylenetriaminepentaacetate (see scheme). Various hydrocarbons of up to seven carbon atoms in length are detected as products in these ATP‐free reactions.
还原生成:已分离出钼和钒氮酶辅助因子,并显示在强还原剂二亚乙基三胺五乙酸铕 (II) 存在下,可将一氧化碳和氰化物离子还原为烷烃和烯烃的混合物(参见方案)。在这些不含 ATP 的反应中,检测到各种长达七个碳原子的碳氢化合物作为产物。
CATALYSTS AND PROCESSES FOR THE FORMATION OF TERMINAL OLEFINS BY ETHENOLYSIS
申请人:Schrock Richard R.
公开号:US20110015430A1
公开(公告)日:2011-01-20
The present invention relates generally to catalysts and processes for the formation of terminal olefin(s) from internal olefin(s) via ethenolysis reactions. The ethenolysis reactions may proceed with high conversion, high turnover, and/or high selectivity.