A. Durch Kondensation von Na-oxalessigester mit n-Butyraldehyd andÖnanthaldehydund nachfolgende Ketonspaltung wurdenγ-n-Propyl-andγ-n-Hexyl-α-keto-γ-lactonherltellt。
Studies in stereoselective [2+2]-cycloadditions with dichloroketene
作者:David I. MaGee、Tammy C. Mallais、Peter D.M. Mayo、George M. Strunz
DOI:10.1016/j.tet.2006.02.014
日期:2006.4
During the investigation of the reaction of dichloroketene with cyclic enoxy-lactones and acyclic enoxy-ester substrates it was found that only the acylic variants effectively participated in the [2+2]-cycloaddition. Although a complete understanding of the reasons for this are lacking, molecular mechanics calculations do suggest that an out of plane twist of the cabonyl group in the acyclic compounds
The fragmentation of isotetronic acidO-methyl ethers under electron impact
作者:C. C. Bonini、C. Iavarone、C. Trogolo、G. A. Poulton
DOI:10.1002/oms.1210160204
日期:1981.2
AbstractThe mass spectra of a series of methyl ethers of isotetronic acids have been examined and the modes of fragmentation rationalized on the basis of two general schemes.
Preparazione di ulteriori ?-cheto-?-lattoni e scissione termica degli ?-cheto-?-lattoni con sostituenti alchilici in posizione ?
作者:H. Schinz、A. Rossi
DOI:10.1002/hlca.19480310711
日期:——
A. Durch Kondensation von Na-oxalessigester mit n-Butyraldehyd und Önanthaldehyd und nachfolgende Ketonspaltung wurden γ-n-Propyl- und γ-n-Hexyl-α-keto-γ-lacton hergestellt.
A. Durch Kondensation von Na-oxalessigester mit n-Butyraldehyd andÖnanthaldehydund nachfolgende Ketonspaltung wurdenγ-n-Propyl-andγ-n-Hexyl-α-keto-γ-lactonherltellt。
Unifying Scheme for the Biosynthesis of Acyl‐Branched Sugars: Extended Substrate Scope of Thiamine‐Dependent Enzymes
(LPSs) of bacteria have branchedsugars in their outer cell membrane with long, highly modified side chains. LPSs are often crucial factors in the pathogenesis of the bacteria. A unifying explanation of the biosynthesis of these highly interesting structures is introduced, based on the investigation of ThDP-dependent enzymes responsible for the linkage of the side chain and the sugar core.