AuCl3/AgSbF6-catalyzed rapid epoxide to carbonyl rearrangement
作者:Vanajakshi Gudla、Rengarajan Balamurugan
DOI:10.1016/j.tetlet.2012.07.056
日期:2012.9
An efficient epoxide to carbonyl rearrangement using catalytic AuCl3/AgSbF6 has been presented. The reactions are fast and high yielding. β-Hydrogen migration takes place exclusively when hydrogen and methyl or substituted methyl groups are present at β-carbon of epoxide. When phenyl/acetyl/benzoyl and hydrogen are available at same carbon atom, migration of the former is preferred over the latter
NMR of enaminones. Part 7<sup>1</sup>H-,<sup>13</sup>C-, and<sup>17</sup>O-NMR and X-ray structure determinations of 1,2-disubstituted conjugated 3-[(<i>tert</i>-Butyl)amino]enones
作者:Jin-Cong Zhuo、Kurt Schenk
DOI:10.1002/hlca.19970800713
日期:1997.11.3
1,N-anti conformations A and B, respectively. The structures of the (E)- and (Z)-form are confirmed by X-ray crystal-structure determinations of 3 and 4. The shielding of the carbonyl O-atom in the 17O-NMR spectrum by intramolecular H-bonding (ΔλHB) ranging from −28 to −41 ppm, depends on the substituents at C(l) and C(2). Crystals of 3 at 90 K are monoclinic. with a = 9.618(2) Å, b = 15.792(3) Å, c