Ketene In Presence Research Articles

Diethyl zinc catalyzed diastereoselective addition of ketenes to ( S)-(+)-3-hydroxytetrahydrofuran

The reaction of ( S)-(+)-3-hydroxytetrahydrofuran with phenyl methyl ketene in presence of n-BuLi and Et 2Zn results in the formation of the diastereomeric esters ( SS+ SR) with a high degree of diastereoselectivity (98:2).

Electrophilic acylation of fluoroolefines by unsaturated perfluoroacylfluorides

It has been found that fluoroolefines are acylated by fluoroanhydrides of α,β-unsaturated perfluorocarboxylic acids in presence of SbF 5 with high yields: ▪ The assumed reaction sceme involves the formation of vynilacylic ion as reactive particle: ▪ The acylation of tetrafluoroethene by bis(trifluoromethyl)ketene in presence of SbF 5 leads to the formation of fluoroanhydride of 2-trifluoromethylperfluoropentenoic acid along with 2- trifluoromethylperfluorovynilethylketone. ▪

Reactions of Free Methylene: Photolysis of Ketene in Presence of Other Gases1,2

Reactions of Free Methylene: Photolysis of Ketene in Presence of Other Gases^1,2