Basf Se Corporation

Christoph Jaekel

Klaus Ebel

Rocco Paciello

Matthias Rauls

Tobias Heinz Steinke

Nawid Kashani-Shirazi

Padavattan Govindaswamy

Maria-Belen Diaz-Valenzuela

The present invention relates to a process for preparing optically active bisphosphinylalkanes from the correspondingly substituted, racemic 1,2-diols. The optically active bisphosphinylalkanes which can be obtained in this way are suitable as ligands for preparing chiral transition metal catalysts.

Process for preparing optically active biophosphinylalkanes

The present invention relates to a process for preparing enriched isopulegol by crystallization from a melt comprising isopulegol. The invention relates specifically to a process for preparing enantiomerically enriched n-isopulegol proceeding from optically active isopulegol having a relatively low enantiomeric excess by crystallization from the melt. The invention further relates to a process for preparing menthol proceeding from enantiomerically and/or diastereomerically enriched n-isopulegol prepared by crystallization from the melt.

Method for the production of enriched isopulegol

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Limburgerhof, Germany

Christoph Jaekel