一类新型腙配体负载的N,O配位半夹心钌配合物,其通式为[Ru(η 6-p-伞花烃)Cl(L)]已方便地以中等至优异的收率获得。这些空气和水分稳定的钌配合物在温和的反应条件下在氰基甲醚合成中表现出优异的催化活性。在钌催化下,三甲基氰硅烷与羰基底物进行一锅反应,得到了各种不同取代基的氰基甲醚,收率良好至优异。优异的催化效率、广泛的底物范围和温和的反应条件使该类钌催化剂具有工业应用潜力。所有半夹心钌配合物均已通过红外、核磁共振和 EA 分析得到了很好的描述。钌配合物1和4的分子结构经单晶X射线分析证实。
Thermal Response, Catalytic Activity, and Color Change of the First Hybrid Vanadate Containing Bpe Guest Molecules
作者:Roberto Fernández de Luis、M. Karmele Urtiaga、José L. Mesa、Edurne S. Larrea、Marta Iglesias、Teófilo Rojo、María I. Arriortua
DOI:10.1021/ic302662x
日期:2013.3.4
and interlayer channels, in which the crystallization water molecules and Bpe guest molecules, respectively, are located. The solvent molecules establish a hydrogen bonding network with the coordinated water molecules. Thermodiffractometric and thermogravimetric studies showed that the loss of crystallization and coordinated water molecules takes place at different temperatures, giving rise to crystal
具有式[Co 2(H 2 O)2(Bpe)2 }(V 4 O 12)]·4H 2 O·Bpe,CoBpe 1的四种同构化合物;[CoNi(H 2 O)2(Bpe)2 }(V 4 O 12)]·4H 2 O·Bpe,CoNiBpe 2;[Co 0.6 Ni 1.4(H 2 O)2(Bpe)2 }(V 4 O 12)]·4H 2 O·Bpe,NiCoBpe 3;和[Ni 2通过水热合成获得了(H 2 O)2(Bpe)2 }(V 4 O 12)]·4H 2 O·Bpe,NiBpe 4。通过单晶X射线衍射(XRD)确定CoBpe 1和NiBpe 4的晶体结构。CoNiBpe 2和NiCoBpe 3 XRD图案的Rietveld精炼证实了它们是同构的。化合物在P中结晶1̅空间群,表现出由Bpe配体构成的无机层构成的晶体结构。晶体结构包含层内和层间通道,分别位于其中的结晶水分子和Bpe客体分子
A cationic aluminium complex: an efficient mononuclear main-group catalyst for the cyanosilylation of carbonyl compounds
A structurally characterized cationic aluminium complex [(AT)Al(DMAP)]+[OTf]- (3) stabilized through less bulky aminotroponate (AT) ligand is reported (DMAP = 4-(dimethylamino)pyridine). It works as an excellent mononuclear main-group catalyst (1 to 2 mol%) for the cyanosilylation of a variety of aldehydes and ketones by consuming just 5 to 30 min at room temperature.
available MgO and anion exchange resins. This catalyst also acts as a heterogeneous catalyst for the epoxidation of electron-deficient olefins with hydrogen peroxide. Further, the catalyst/product(s) separation can be easily carried out by the simple filtration (or centrifugation) and the reaction is immediately stopped by the removal of the solid catalyst, suggesting that the nature of the observed
Tri-lacunary polyoxometalates of Na8H[PW9O34] as heterogeneous Lewis base catalysts for Knoevenagel condensation, cyanosilylation and the synthesis of benzoxazole derivatives
作者:Shen Zhao、Yang Chen、Yu-Fei Song
DOI:10.1016/j.apcata.2014.01.017
日期:2014.4
development of tri-lacunary polyoxometalates (POMs) of Na8H[A-PW9O34]·7H2O and Na8H[B-PW9O34]·19H2O (Na-A-PW9 and Na-B-PW9) as highlyselective and efficient heterogeneous Lewis base catalysts for Knoevenagel condensation, cyanosilylation of various aldehydes and ketones and the synthesis of benzoxazole derivatives at 25 °C under mild conditions. Since both Na-A-PW9 and Na-B-PW9 display no characteristic porosity
calcination of the Sn–W hydroxide at 800 °C acts as an effective and reusable solid catalyst for CCbond‐formingreactions, such as the cyclization of citronellal, the Diels–Alder reaction, and the cyanosilylation of carbonyl compounds with trimethylsilyl cyanide (see scheme). The observed catalysis was truly heterogeneous, and the recovered catalyst could be reused without loss of its high catalytic performance