发明名称 |
METHOD FOR PRODUCING OPTICALLY ACTIVE, RACEMIC MENTHOL |
摘要 |
The present invention relates to a particularly economic overall method for producing menthol, specifically for producing optically active, essentially enantiomerically and diastereomerically pure L-menthol and racemic menthol, starting from the starting material citral which is available inexpensively on an industrial scale. The method comprises the following steps a.1) catalytic hydrogenation of neral and/or geranial to give citronellal, b.1) cyclization of citronellal to isopulegol in the presence of an acidic catalyst, c.1) purification of isopulegol by crystallization and d.1) catalytic hydrogenation of isopulegol to give menthol.
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申请公布号 |
US2013046118(A1) |
申请公布日期 |
2013.02.21 |
申请号 |
US201213658003 |
申请日期 |
2012.10.23 |
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 |
分类号 |
C07C29/17 |
主分类号 |
C07C29/17 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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