Several methods for the preparation of long-chain vicinal diketones are examined. The acyloincondensation, followed by oxidation, provides an excellent route to symmetrical compounds but is not satisfactory for unsymmetrical diketones. The latter are prepared (i) from dialkylacetylenes by semihydrogenation, hydroxylation, and oxidation with aqueous N-bromosuccinimide; and (ii) from an α-acetoxy-acid
Reactions en milieu heterogene solide-liquide faiblement hydrate : la reaction de wittig dans le systeme hydroxydes alcalins/solvant organique aprotique
作者:Yves Le Bigot、Michel Delmas、Antoine Gaset
DOI:10.1016/s0040-4020(01)85886-5
日期:1988.1
The Wittig reaction carried out in a slighty hydrated solid-liquid media constituted by a solid alkaline hydroxyde and an organic phase which includes the phosphonium salt and the aldehyde leads easily to the corresponding alkene with very good yields specially with furanic aldehydes. The ylide formation at the interface appears as the most important step of this condensation.
Carbonylation of isobutylene, its oligomers, and N-olefins by carbon monoxide in the presence of BF3 complexes with propionic, acetic or chloroacetic acids
作者:S. D. Pirozhkov、K. V. Puzitskii、T. N. Myshenkova、K. G. Ryabova、Ya. T. �idus
DOI:10.1007/bf00920819
日期:1976.7
Asinger, Chemische Berichte, 1942, vol. 75, p. 670,671