摘要 |
The invention relates to a particularly economic, complete method for producing menthol, especially for the production of optically active, essentially enantiomerically and diastereomerically pure L-menthol and of racemic menthol starting from the commercially accessible, inexpensive parent material citral. The method comprises the following steps: a.1 ) catalytic hydrogenation of neral and/or geranial to form citronellal, b.1 ) cyclisation of citronellal to form isopulegol in the presence of an acidic catalyst, c.1 ) purification of isopulegol by crystallisation and d.1 ) catalytic hydrogenation of isopulegol to form menthol. |
申请人 |
BASF SE;HEYDRICH, GUNNAR;GRALLA, GABRIELE;RAULS, MATTHIAS;SCHMIDT-LEITHOFF, JOACHIM;EBEL, KLAUS;KRAUSE, WOLFGANG;OEHLENSCHLAEGER, STEFFEN;JAEKEL, CHRISTOPH;FRIEDRICH, MARKO;BERGNER, EIKE JOHANNES;KASHANI-SHIRAZI, NAWID;PACIELLO, ROCCO |
发明人 |
HEYDRICH, GUNNAR;GRALLA, GABRIELE;RAULS, MATTHIAS;SCHMIDT-LEITHOFF, JOACHIM;EBEL, KLAUS;KRAUSE, WOLFGANG;OEHLENSCHLAEGER, STEFFEN;JAEKEL, CHRISTOPH;FRIEDRICH, MARKO;BERGNER, EIKE JOHANNES;KASHANI-SHIRAZI, NAWID;PACIELLO, ROCCO |