Photochemistry of some non-conjugated unsaturated 1,2-diketones
作者:R. Bishop、N. K. Hamer
DOI:10.1039/j39700001197
日期:——
A study of the photochemical reactions of some βγ-unsaturated and γδ-unsaturated 1,2-diketones is reported; it is concluded that the only efficient primary intramolecular processes involve the carbonyl group furthest removed from the alkyl chain, which may undergo cycloaddition via a five-membered transition state to give 5-oxabicyclo-[2,1,1]hexan-2-one derivatives, or γ-hydrogen abstraction leading
Synthesis and the electronic spectra of the first ß-ketoacylsilanes and their lithium enolates: new insights into hyperconjugation in acylsilanes and their enolates
cyclobutanedione ring to give the corresponding ß-ketoacylsilane lithiumenolates 2a–2c, which after aqueous work-up gave the first known ß-ketoacylsilanes 3a and 3b and ß-ketoacylgermane 3c. The first X-ray structure of a ß-ketoacylsilane, that of lithiumenolate 2a, is reported and discussed. The UV-visible spectra of the lithiumenolates 2 exhibits two new transitions: one absorption is “red” shifted