24089-15-4Relevant articles and documents
Unsymmetrical unsaturated ketones from lactones and carboxylic acids in one step
Giersch, Wolfgang,Naef, Ferdinand
, p. 1704 - 1710 (2007/10/03)
A one-step transformation of γ- and δ-(spiro)lactones into γ,δ- and δ,ε-unsaturated ketones in the presence of carboxylic acids in the vapor phase at 400° over a supported manganese catalyst is reported for the first time. The scope of this new transformation is exemplified with a series of lactones, and a mechanistic rationale is proposed.
FORMATION DE CETONES ETHYLENIQUES PAR ACTION D'ACIDE ACETYLSULFOACETIQUE SUR DES ALCENES
Loiseau, Andre-Michel,Luft, Robert,Zunino, Serge
, p. 144 - 152 (2007/10/02)
Monoalkyl- and 1,2-dialkylethylenes have a similar behaviour under the action of acetylsulfoacetic acid : the reaction does not necessarily stop after the formation of α- or β-enones, the yield of which is highly influenced by reaction time; thus, 1-acetoxy-1,3-dienes are identified in the case of α-enones.A different behaviour is shown by 1,1-dialkyl and trialkylethylenes, which can constitute an interesting source of highly branched enones.With this second group of alkenes, isomerisation of the alkene is sometimes observed prior to acetylation.Lastly, some alkenes undergo acetoxylation at the same time as acetylation.
