作者:Frank T. Edelmann、Stephan Gießmann、Axel Fischer
DOI:10.1016/s0022-328x(00)00867-6
日期:2001.2
the ‘tucked-in’ fulvene complex Cp*Ti(C5Me4CH2) to give the titanium(III) silsesquioxane Cp*2Ti[Cy7Si7O10(OSiMe3)2] (21). In a similar manner treatment of Cp*Ti(C5Me4CH2) with Cy7Si7O9(OH)2(OSiMe3) (14) affords the mono(pentamethylcyclopentadienyl) complex Cp*Ti[Cy7Si7O11(OSiMe3)][Cy7Si7O10-(OH)(OSiMe3)] (22) which is an advanced model compound for a catalytically active titanium center on a silica surface
不完全缩合的倍半硅氧烷衍生物Cy 7 Si 7 O 9(OH)3(1)与Ti(OEt)4的反应得到二聚体钛硅倍半氧烷[(Cy 7 Si 7 O 12)Ti(μ-OEt)(EtOH)] 2(13)以81%的产率。已知的钛硅倍半硅氧烷[Cy 7 Si 7 O 11(OSiMe 3)] 2 Ti(18)已通过改进的方法从四烷氧基钛开始制备。从钛茂二卤化物与Cy 7 Si 7 O 9(OH)2(OSiMe 3)(14)反应获得了新的氧钛硅倍半氧烷衍生物。Cp 2 TiCl 2产生双核(μ-O)[Cy 7 Si 7 O 11(OSiMe 3)} TiCp] 2(19),而Cp * 2 TiCl 2产生三核钛环Cp * 2 Ti 3 O 3得到[Cy 7 Si 7 O 11(OSiMe 3)] 2(20)。另外,已经开发出一种新的合成路线来模拟固定在二氧化硅上的钛催化剂的化合物。二甲基化的Cy 7 Si
Silsesquioxanes as models for silica surfaces
作者:Frank J. Feher、David A. Newman、John F. Walzer
DOI:10.1021/ja00187a028
日期:1989.3
The hydrolytic condensation of cyclohexyltrichlorosilane (CySiCl/sub 3/) affords (Cy/sub 7/Si/sub 7/O/sub 9/(OH)/sub 3/) (1), (Cy/sub 6/Si/sub 6/O/sub 9/) (2), and (Cy/sub 8/Si/sub 8/O/sub 11/(OH)/sub 2/) (3a). Trisilanol 1 and 3b, the bis(triphenyltin) derivative of 3a, have been structurally characterized by single-crystal X-ray diffraction studies. Trisilanol 1 undergoes corner-capping reactions
Synthesis and structural characterisation of tripodal titanium silsesquioxane complexes: a new class of highly active catalysts for liquid phase alkene epoxidation
作者:Mark Crocker、Ruud H. M. Herold、Mark Crocker、A. Guy Orpen
DOI:10.1039/a704969b
日期:——
Titanium silsesquioxane complexes [Ti(L)(R7Si7O12)], possessing tripodal geometry, represent models for heterogeneous titanosilicate catalysts; the new complexes are exceptionally active and selective catalysts for liquid phase alkene epoxidation reactions.
Synthesis and structural characterisation of platinum silasesquioxane complexes
作者:Hendrikus C. L. Abbenhuis、Rutger A. van Santen、Andrew D. Burrows、Mark T. Palmer、Huub Kooijman、Martin Lutz、Anthony L. Spek
DOI:10.1039/a808130a
日期:——
The reaction of partially condensed silasesquioxanes of the type [R17Si7O9(OH)2(OR2)] (R1 = c-C5H9, c-C6H11; R2 = H, SiMe3) with either [Pt(dppe)(CO3)] or [Pt(dppe)Cl2]/Ag2O leads to the formation of [R17Si7O9(OR2)O2Pt(dppe)], crystallographically characterised for R1 = c-C5H9; R2 = SiMe3, providing unprecedented routes to late transition metal silasesquioxane complexes.
Synthesis and characterisation of titanium silasesquioxane complexes: soluble models for the active site in titanium silicate epoxidation catalysts †
作者:Mark Crocker、Ruud H. M. Herold、A. Guy Orpen、Martijn T. A. Overgaag
DOI:10.1039/a905887g
日期:——
activity for 16 and 17, it is concluded that the most active site in titanium silicate epoxidation catalysts corresponds to a four-co-ordinate site possessing tripodal geometry. Studies using IR and NMR spectroscopy show that, in the absence of olefins, putative alkylperoxocomplexes formed by the addition of TBHP to tripodal complexes decompose rapidly at ambient temperature. Based on the high TBHP-to-epoxide
制备了硅倍半硅氧烷钛配合物,作为硅酸钛氧化催化剂中催化活性中心的模型。配合物[TiL(R 7 Si 7 O 12)] [R = c -C 6 H 11,L = CH 2 Ph 5,NMe 2 6,OSiMe 3 7,OPr i 8或OBu t 9; R = c- C 5 H 9,L = CH 2 Ph 13或OPr i 14]是由不完全缩合的硅倍半氧烷R 7 Si 7 O 9的反应制备的。(OH)3 1,2与均配物TiL 4。由以下制备芳氧基衍生物[TiL(R 7 Si 7 O 12)] [R = c -C 6 H 11,L = OPh 10,OC 6 H 4 F- p 11或OC 6 H 4 NO 2 - p 12]。 8与相应的芳基醇的反应。在5-14上获得的29 Si和13 C NMR光谱数据表明,局部C 3v倍半硅氧烷配体的对称性保留在钛上,这与具有三脚架几何形状的单体配合物