New synthetic reactions. Oxidative decarboxylation of .alpha.-methylthiocarboxylic acids, new approach to acyl anion and ketene synthons
作者:Barry M. Trost、Yoshinao Tamaru
DOI:10.1021/ja00451a041
日期:1977.4
Yur'ev, Yu. N., Journal of Organic Chemistry USSR (English Translation), 1982, p. 1020 - 1024
作者:Yur'ev, Yu. N.
DOI:——
日期:——
Verlustfreie Katalysatorrezirkulation durch ein neuartiges Verfahrensprinzip bei der Hydroformylierung höhermolekularer Olefine
作者:Zhigao Xia、Bernhard Fell
DOI:10.1002/prac.19973390127
日期:——
In this paper a novel homogenous-heterogeneous procedure for the hydroformylation reaction of higher molecular olefins is presented, at which the reaction itself is homogeneously catalyzed and only after the reaction the catalyst complex is heterogenized only for separation. This procedure is achieved by using the lithium salt of triphenylphosphine monosulfonic acid (Li-TPPMS) as complex ligand for the hydroformylation catalyst and methanol as solubilizer. Li-TPPMS and its complexes with metal carbonyls are highly soluble in water and methanol, but completely insoluble in almost all other organic solvents. After the reaction the methanol is distilled off. The catalyst system becomes insoluble and can be separated from the reaction product by filtration or by extraction with water. The aqueous catalyst solution is evaporated to dryness and the catalyst system dissolved in methanol for a new reaction.