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.