Magnesium triflate [Mg(OTf)2] a highly stable, non-hygroscopic and a recyclable catalyst for the high yielding preparation of diethyl α-trimethylsilyloxyphosphonates from diethyl α-hydroxyphosphonates by HMDS under solventless conditions
and convenient procedure for the easy conversion of various α-hydroxyphosphonates to α-trimethylsilyloxyphosphonates under mild conditions with HMDS in the presence of a catalytic amount of magnesium triflate as a highly stable and a non-hygroscopic recyclable catalyst in neat conditions is described. In order to show the general applicability of this method, we have also applied this procedure successfully
Aluminium Triflate [Al(OTf)<sub>3</sub>] as a Recyclable Catalyst for the Conversion of α-Hydroxyphosphonates, Alcohols and Phenols to Their Corresponding O-Silylated Products with Hexamethyldisilazane (HMDS)
Al(OTf)3 as a recyclable catalyst conducts the efficient conversion of various types of α-hydroxyphosphonates to their corresponding α-trimethysilyloxyphosphonates with HMDS in the absence of solvent at room temperature. The general applicability of the catalyst under solvent-free conditions is demonstrated by applying it for the successful silylation of alcohols and phenols with HMDS in high yields.
Iron(III) trifluoroacetate [Fe(F3CCO2)3] as an easily available, non-hygroscopic, non-corrosive, highly stable and a reusable Lewis Acid catalyst: Efficient O-silylation of α-hydroxyphosphonates, alcohols and phenols by hexamethyldisilazane (HMDS) under solvent-free conditions
作者:Habib Firouzabadi、Nasser Iranpoor、Abbas Ali Jafari、Mohammad Reza Jafari
DOI:10.1016/j.jorganchem.2008.05.018
日期:2008.8
O-Silylation of hydroxylgroups of α-hydroxyphosphonates, primary, secondary tertiary-alcohols and phenols with HMDS was achieved in high to excellent yields using iron(III) trifluoroacetate [Fe(F3CCO2)3] as an easily available and a cost effective, non-hygroscopic, non-corrosive, highly stable and an efficient catalyst under solvent-free conditions. As a typical reaction, we have scaled up silylation of diphenyl
作者:Janish Desai、Yang Wang、Ke Wang、Satish R. Malwal、Eric Oldfield
DOI:10.1002/cmdc.201600343
日期:2016.10.6
overexpression of FPPS, and there was synergistic activity with known isoprenoidbiosynthesis pathway inhibitors. Lipophilic hydroxyalkyl phosphonic acids inhibited UPPS and UPPP at micromolar levels; they were active (∼2–6 μg mL−1) against Gram‐positive but not Gram‐negative organisms, and again exhibited synergistic activity with cell wall biosynthesis inhibitors, but only indifferent effects with other inhibitors
characterized by 1H NMR spectroscopic analyses. The structures of complexes 2, 3, 4, and 6 were determined by single‐crystal X‐ray analyses. Study of the catalytic activities of the complexes showed that these rare earth metal amido complexes were excellent catalysts for hydrophosphonylations of aldehydes and unactivated ketones. The catalyzed reactions between diethylphosphite and aldehydes in the presence
通过甲硅烷基胺消除反应制备了一系列带有亚甲基连接的吡咯基-酰胺基配体的稀土金属酰胺配合物,在无溶剂条件下,液态底物在醛和未活化酮的氢膦酰化反应中显示出很高的催化活性。的治疗[(ME 3 Si)的2 N] 3 LN(μ-Cl)的锂(THF)3与2-(2,6--ME 2 ç 6 ħ 3 NHCH 2)C 4 H ^ 3 NH(1,1个当量)在甲苯,得到相应的式三价稀土金属酰胺(μ-η 5:η 1):η 1-2-[(2,6-Me 2 C 6 H 3)NCH 2 ](C 4 H 3 N)LnN(SiMe 3)2 } 2 [Ln = Y(2),Nd(3),Sm(4),Dy(5),Yb(6)],产量适中。所有化合物均通过光谱法和元素分析充分表征。钇配合物的特征还在于1 H NMR光谱分析。复合物的结构 2,3,4,和6由单晶X射线分析确定。配合物催化活性的研究表明,这些稀土金属酰胺配合物是醛和未活化