发现Mg-Al-O- t -Bu水滑石催化剂是一种有效的,对环境有吸引力的,对1,4迈克尔加成反应有选择性的固体碱催化剂。Mg–Al–O– t – Bu水滑石通过Knoevenagel缩合反应将相应的活化羧酸酯或腈与各种醛缩合,对于简单合成α,β-不饱和酯和腈也有效。这些反应在室温下以Mg–Al–O– t – Bu水滑石的存在速率比在其他任何催化剂存在下的速率更高。
Layered Double Hydroxides-Supported Diisopropylamide: Synthesis, Characterization and Application in Organic Reactions
作者:M. Lakshmi Kantam、A. Ravindra、Ch. Venkat Reddy、B. Sreedhar、B. M. Choudary
DOI:10.1002/adsc.200505266
日期:2006.3
The layereddoublehydroxides-supporteddiisopropylamide (LDH-DA) catalyst is found to be an efficient and selective solid base for aldol, Knoevenagel, Henry, Michael, transesterification and epoxidation reactions under liquid phase conditions. LDH-DA is synthesized by the interaction of lithium diisopropylamide with LDH-NO3 (as-synthesized) and calcined LDH-NO3. The LDH-DA (Mg/Al, 3/1) and their precursors
发现层状双氢氧化物负载的二异丙基酰胺(LDH-DA)催化剂是在液相条件下用于醇醛,Knoevenagel,Henry,Michael,酯交换和环氧化反应的有效且选择性的固体碱。LDH-DA是通过二异丙基氨基锂与LDH-NO 3(合成后)和煅烧的LDH-NO 3相互作用而合成的。通过使用各种仪器技术,如FT-IR,TGA和DTA,粉末XRD,固态27 Al MAS NMR光谱,SEM和XPS(ESCA ),可以很好地表征LDH-DA(Mg / Al,3/1)及其前体)。
Catalytic C–C Bond Formation Promoted by Mg–Al–O–t-Bu Hydrotalcite
Mg–Al–O–t-Bu-hydrotalcite catalyst was found to be an efficient, environmentally attractive and selective solidbasecatalyst for 1,4 Michaeladdition. Mg–Al–O–t-Bu hydrotalcite is also effective for simple synthesis of α,β-unsaturated esters and nitriles by condensation of the corresponding activated carboxylic esters or nitriles with various aldehydes by Knoevenagel condensation. These reactions
发现Mg-Al-O- t -Bu水滑石催化剂是一种有效的,对环境有吸引力的,对1,4迈克尔加成反应有选择性的固体碱催化剂。Mg–Al–O– t – Bu水滑石通过Knoevenagel缩合反应将相应的活化羧酸酯或腈与各种醛缩合,对于简单合成α,β-不饱和酯和腈也有效。这些反应在室温下以Mg–Al–O– t – Bu水滑石的存在速率比在其他任何催化剂存在下的速率更高。
Chiral Bisphosphazides as Dual Basic Enantioselective Catalysts
Chiralbisphosphazides complexed with lithium salts efficiently catalyze the direct enantioselective 1,4-addition of dialkyl malonates to acyclic enones. Spectroscopic studies on the stoichiometry of the bisphosphazide and lithium salt have indicated the formation of a 1:1 species as the active enantioselectivecatalyst. It is suggested that the catalyst generates a complex of the protonated phosphazide
Magnesium-Lanthanum Mixed Metal Oxide: a Strong Solid Base for the Michael Addition Reaction
作者:Bhaskar Veldurthy、Jean Marc Clacens、François Figueras
DOI:10.1002/adsc.200404371
日期:2005.5
Michael additions were achieved quantitatively at room temperature with a broad spectrum of acceptors and donors, using a magnesium-lanthanum mixed oxide, a strong solid base. The best solvent for the reaction is dimethylformamide, but good yields were also obtained using toluene as solvent. The results obtained with magnesium-lanthanum are comparable to those reported for super bases. The catalyst
Preparation of new layered double hydroxides exchanged with diisopropylamide for c-c bond forming reaction
申请人:Council of Scientific and
Industrial Research
公开号:EP1352687A1
公开(公告)日:2003-10-15
The present invention relates to design and preparation of LDH- diisopropylamide through simple exchange process for the first time and its use in catalytic amounts for preparing aldols / α,β-unsaturated nitriles / α,β-unsaturated esters / transesterified products / β-nitroalkanols / Michael adducts and epoxide, resulting in higher yields.