| abstract |
The present invention relates to a process for preparing a diol of the formulae (Ia) or (Ib), or a mixture thereof, n n n n n n n n n n comprising the reaction of an epoxy alcohol of formulae (Va) or (Vb), or a mixture thereof, n n n n n n n n n n with alkali metal borohydride or earth alkaline borohydride, in particular sodium borohydride, and anhydrous aluminum(III) chloride. n The invention also relates to processes and intermediates for preparing an epoxy alcohol of formulae (Va) or (Vb). The invention furthermore relates to processes for preparing cis-metconazole in which a diol of the formulae (Ia) or (Ib) is applied as a precursor. |