The Experts below are selected from a list of 108 Experts worldwide ranked by ideXlab platform
Sadao Tsuboi - One of the best experts on this subject based on the ideXlab platform.
-
novel synthesis of 4 halo 3 hydroxy 2 pyrone one pot rearrangement cyclization reaction by Magnesium Halide
Tetrahedron, 2005Co-Authors: Takuzo Komiyama, Yutaka Takaguchi, A T Gubaidullin, Vakhid A Mamedov, I A Litvinov, Sadao TsuboiAbstract:Abstract Treatment of acetonide protected 4,5-dihydroxy-2-chloroglycidic ester or its rearrangement product, the acetonide protected 4,5-dihydroxy-3-chloro-2-oxo ester, with Magnesium Halides gave 4-halo-3-hydroxy-2-pyrone in excellent to reasonable yields in one pot. The mechanism of this novel one pot rearrangement–cyclization reaction is also proposed.
-
Novel synthesis of 4-halo-3-hydroxy-2-pyrone: one pot rearrangement–cyclization reaction by Magnesium Halide
Tetrahedron, 2005Co-Authors: Takuzo Komiyama, Yutaka Takaguchi, A T Gubaidullin, Vakhid A Mamedov, I A Litvinov, Sadao TsuboiAbstract:Abstract Treatment of acetonide protected 4,5-dihydroxy-2-chloroglycidic ester or its rearrangement product, the acetonide protected 4,5-dihydroxy-3-chloro-2-oxo ester, with Magnesium Halides gave 4-halo-3-hydroxy-2-pyrone in excellent to reasonable yields in one pot. The mechanism of this novel one pot rearrangement–cyclization reaction is also proposed.
Takuzo Komiyama - One of the best experts on this subject based on the ideXlab platform.
-
novel synthesis of 4 halo 3 hydroxy 2 pyrone one pot rearrangement cyclization reaction by Magnesium Halide
Tetrahedron, 2005Co-Authors: Takuzo Komiyama, Yutaka Takaguchi, A T Gubaidullin, Vakhid A Mamedov, I A Litvinov, Sadao TsuboiAbstract:Abstract Treatment of acetonide protected 4,5-dihydroxy-2-chloroglycidic ester or its rearrangement product, the acetonide protected 4,5-dihydroxy-3-chloro-2-oxo ester, with Magnesium Halides gave 4-halo-3-hydroxy-2-pyrone in excellent to reasonable yields in one pot. The mechanism of this novel one pot rearrangement–cyclization reaction is also proposed.
-
Novel synthesis of 4-halo-3-hydroxy-2-pyrone: one pot rearrangement–cyclization reaction by Magnesium Halide
Tetrahedron, 2005Co-Authors: Takuzo Komiyama, Yutaka Takaguchi, A T Gubaidullin, Vakhid A Mamedov, I A Litvinov, Sadao TsuboiAbstract:Abstract Treatment of acetonide protected 4,5-dihydroxy-2-chloroglycidic ester or its rearrangement product, the acetonide protected 4,5-dihydroxy-3-chloro-2-oxo ester, with Magnesium Halides gave 4-halo-3-hydroxy-2-pyrone in excellent to reasonable yields in one pot. The mechanism of this novel one pot rearrangement–cyclization reaction is also proposed.
Wolfgang Voigt - One of the best experts on this subject based on the ideXlab platform.
-
crystal structures of hydrates of simple inorganic salts part 1 water rich Magnesium Halide hydrates mgcl2 8h2o mgcl2 12h2o mgbr2 6h2o mgbr2 9h2o mgi2 8h2o and mgi2 9h2o
ChemInform, 2014Co-Authors: Erik Hennings, Horst Schmidt, Wolfgang VoigtAbstract:Crystals of MgCl2·8H2O (I), MgCl2·12H2O (II), MgBr2·6H2O (III), MgBr2·9H2O (IV), MgI2·8H2O (V), and MgI2·9H2O (VI) are grown from their aqueous solutions at below 298 K according to their solid-liquid phase diagrams.
-
crystal structures of hydrates of simple inorganic salts i water rich Magnesium Halide hydrates mgcl2 8h2o mgcl2 12h2o mgbr2 6h2o mgbr2 9h2o mgi2 8h2o and mgi2 9h2o
Acta Crystallographica Section C-crystal Structure Communications, 2013Co-Authors: Erik Hennings, Horst Schmidt, Wolfgang VoigtAbstract:The previously reported structures of the hydrates of simple inorganic salts that crystallize at room temperature are generally well determined. This is not true for water-rich hydrates, which crystallize at temperatures below 273 K. In this series, investigations of the crystal structures of water-rich hydrates crystallized from aqueous solutions at low temperatures are presented. Reported herein are the structures of a set of Magnesium salts. Crystals of MgCl2·8H2O (Magnesium dichloride octahydrate), MgCl2·12H2O (Magnesium dichloride dodecahydrate), MgBr2·6H2O (Magnesium dibromide hexahydrate), MgBr2·9H2O (Magnesium dibromide nonahydrate), MgI2·8H2O (Magnesium diiodide octahydrate) and MgI2·9H2O (Magnesium diiodide nonahydrate) were grown from their aqueous solutions at temperatures below 298 K according to the solid–liquid phase diagrams. All structures are built up from Mg(H2O)6 octahedra. Dimensions and angles in the hexaaqua cation complexes are very similar and variation is not systematic. The anions are incorporated into a specific network of O—H⋯X hydrogen bonds.
Thomas R Hoye - One of the best experts on this subject based on the ideXlab platform.
-
a useful modification of the evans Magnesium Halide catalyzed anti aldol reaction application to enolizable aldehydes
Synlett, 2010Co-Authors: Nathan T Connell, Heidi A Dahlmann, Thomas R HoyeAbstract:A practical protocol for use of the Magnesium Halide-catalyzed anti-aldol reaction of an Evans N-acyloxazolidinone with enolizable aldehydes is reported. The yields of anti-aldol adducts for saturated or unsaturated and branched or unbranched aliphatic aldehydes are preparatively useful.
Jason S Tedrow - One of the best experts on this subject based on the ideXlab platform.
-
Magnesium Halide catalyzed anti aldol reactions of chiral n acylthiazolidinethiones
Organic Letters, 2002Co-Authors: David A Evans, Wade C Downey, Jared T Shaw, Jason S TedrowAbstract:Diastereoselective direct aldol reactions of chiral N-acylthiazolidinethiones occur in high yield with preference for the illustrated anti diastereomer. This reaction is catalyzed by 10% MgBr2·OEt2 in the presence of triethylamine and chlorotrimethylsilane. Yields range from 56 to 93% with diastereoselectivity up to 19:1 for a variety of N-acylthiazolidinethiones and unsaturated aldehydes.
-
diastereoselective Magnesium Halide catalyzed anti aldol reactions of chiral n acyloxazolidinones
Journal of the American Chemical Society, 2002Co-Authors: David A Evans, Jared T Shaw, Jason S Tedrow, Wade C DowneyAbstract:A chiral auxilliary-based direct aldol reaction is reported. The reactions are catalytic in Magnesium salts and are facilitated by silylation with chlorotrimethylsilane. The adducts isolated are in high diastereoselectivity (up to 32:1 dr) and favor the anti-aldol diastereomer B. Reactions are operationally simple and can be run under ambient atmosphere without rigorous exclusion of water. Many of the adducts are highly crystalline and a single diastereomer can be isolated without chromatography.
