| 摘要 |
Neo-carboxylic acids are prepared by reacting formic acid with an acyclic or alicyclic olefin containing more than 3 carbon atoms, or an olefinic acting substance, in the presence of concentrated sulphuric acid and thereafter allowing an organic phase to separate from the sulphuric acid solution by adding an amount of water up to 25% w/w based on sulphuric acid present, and recovering the neo-acid as the organic phase. Neo-acids are defined as tertiary aliphatic carboxylic acids in which the a -carbon atom is a quaternary carbon atom. Olefinic acting substances are defined as being capable of reacting with formic acid in the presence of concentrated sulphuric acid as if they were olefins, e.g. tertiary halides, alcohols, tertiary mercaptans or isoparaffins and a hydride acceptor. The reaction may be effected at -20 DEG C. to +30 DEG C. in the presence of a solvent, e.g. a chlorinated hydrocarbon. Olefins employed in the examples are propylene trimer, di-iso-butylene and propylene tetramer. |
