Patent ID: 8003829

Claim:
A method for working up an aluminum-containing reaction product from the production of isopulegol by cyclizing citronellal, comprising i) isopulegol; and ii) at least one ligand of formula (I), wherein R 1 , R 2 , and R 3 are, in each case independently of one another, hydrogen, halogen, nitro, C 1 -C 8 -alkyl, C 1 -C 8 -alkoxy, di(C 1 -C 4 -alkyl)amino, or optionally substituted aryl; and R 4 and R 5 are, in each case independently of one another, halogen, nitro, C 1 -C 8 -alkyl, C 1 -C 8 -alkoxy, di(C 1 -C 4 -alkyl)amino, or optionally substituted aryl or heteroaryl; in free and/or complex-bound form; said method comprising a) subjecting the reaction product to distillative separation to obtain an isopulegol-enriched top product and an isopulegol-depleted bottom product; and b) separating the ligands of formula (I) off from said isopulegol-depleted bottom product.