Samarium(III) tris(2,6-di-tert-butyl-4-methylphenoxide) (1), which is a highly coordinatively unsaturated complex, was prepared by the reaction of samarium(III) iodide with sodium 2,6-di-tert-butyl-4-methylphenoxide, and the crystal structure of its acetonitrile complex was determined by X-ray analysis. Complex 1 catalyzed the sequential Michael-Michael-aldol reaction of 3,3-dimethyl-2-butanone with
Hypoiodite-catalysed oxidative cyclisation of Michael adducts of chalcones with 1,3-dicarbonyl compounds: a facile and versatile approach to substituted furans and cyclopropanes
Through hypoiodite catalysis, the oxidative cyclisation of Michael adducts of chalcones with 1,3-dicarbonyl compounds for divergent synthesis of either furans or cyclopropanes is developed. The selective synthesis of major products...
New Application of 1,4-Dihydropyridine System: Michael Reactions Mediated by 1,4-Dihydropyridine–Enolate Adduct in Micellar Medium
作者:Sabir H. Mashraqui、Madhavi A. Karnik
DOI:10.1246/cl.2003.1064
日期:2003.11
1,4-dihydropyridine-acetophenone enolate adduct, in catalytic amount effects Michael reactions in aqueous cationic micelles of cetyltrimethylammonium bromide. The enolate, generated by dissociation of the adduct abstracts a proton from readily enolizable substrates to bring about the Michael reaction under mild conditions in fair to good yields without side products.
Conformational Role of Xanthan Gum in its Interaction with Guar Gum
作者:F. Wang、Y.J. Wang、Z. Sun
DOI:10.1111/j.1365-2621.2002.tb09580.x
日期:2002.11
the effects of chain conformational changes of xanthan or deacetylated xanthangum on its interaction with guar gum. Guar gum was not effective in denaturing xanthangum when the xanthan helical structure was stabilized by salt. The intrinsic viscosities of deacetylated xanthan and guar blends were higher than those calculated from the weight averages of the 2. Conformational change was not observed
Iron(iii) catalysis of the Michael reaction of 1,3-dicarbonyl compounds and enones
作者:Jens Christoffers
DOI:10.1039/a700838d
日期:——
Iron(III) chloride hexahydrate catalyses the Michael
reaction of β-dicarbonyl compounds and enones under mild and neutral
conditions with excellent yields and product selectivity.