62572-35-4Relevant articles and documents
The Mukaiyama aldol and Mukaiyama-Michael reactions promoted by commercially available molecular sieves
Anada, Masahiro,Washio, Takuya,Watanabe, Yudai,Hashimoto, Shunichi
experimental part, p. 1489 - 1503 (2010/10/20)
The Mukaiyama aldol reaction of silyl ketene acetals with aldehydes has been effected by using commercially available 4 molecular sieves (4 MS) as a promoter. Various silyl ketene acetals and silyl enol ethers have been shown to be effective nucleophiles
ScIII-Doped zeolites as new heterogeneous catalysts: mukaiyama aldol reaction
Olmos, Andrea,Alix, Aurelien,Sommer, Jean,Pale, Patrick
supporting information; experimental part, p. 11229 - 11234 (2010/04/28)
ScIII-doped solids based on zeolite materials have been investigated for the first time as catalysts in organic synthesis. Sc III-USY zeolite proved to be a novel and very efficient heterogeneous catalyst for the Mukaiyama aldol reaction. This easy-to-prepare catalyst exhibited wide scope and compatibility with functional groups and is very simple to use, easy to remove (by simple filtration), and is recyclable (up to three times without loss of activity).
Acid-base catalyses by dimeric disilicoicosatungstates and divacant γ-Keggin-type silicodecatungstate parent: Reactivity of the polyoxometalate compounds controlled by step-by-step protonation of lacunary W{double bond, long}O sites
Yoshida, Akihiro,Hikichi, Shiro,Mizuno, Noritaka
, p. 455 - 459 (2008/02/06)
The catalytic properties of disilicoicosatungstates, [{γ-SiW10O32(H2O)2}2(μ-O)2]4- (2) and [H(γ-SiW10O32)2(μ-O)4]7- (3), and their parent divacant γ-Keggin type silicodecatungstate, [γ-SiW10O34(H2O)2]4- (1), toward C-C bond formation reactions have been investigated. The disilicoicosatungstate 2 with aquo ligands exhibits the acidic nature and catalyzes the Mukaiyama-aldol condensation and carbonyl-ene reaction, while 1 and 3 are rather basic and catalyze the Knoevenagel condensation. Therefore, the acid-base properties of a series of lacunary γ-Keggin silicotungstate derivatives 1-3 are clearly different, and the catalyses of 1-3 depend on the molecular structures while 1-3 are composed of a common [SiW10O32] fragment.