triene‐substituted tetrahydrofuran metabolite is described. The key step, for the installation of the stereogenic center of the trienyl side chain, involves a stereofacially reduction of oxocarbenium ions directed by the hydride donor.
(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.
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.