[Cl:1][C:2]1[CH:7]=[CH:6][C:5]([C@H:8]2[CH2:13][CH2:12][C@H:11]([C:14]3[C:15](=[O:26])[C:16]4[C:21]([C:22](=[O:25])[C:23]=3Cl)=[CH:20][CH:19]=[CH:18][CH:17]=4)[CH2:10][CH2:9]2)=[CH:4][CH:3]=1.[OH-:27].[Na+]>CO.O>[CH:18]1[CH:19]=[CH:20][C:21]2[C:22]([C:23]([OH:27])=[C:14]([C@@H:11]3[CH2:10][CH2:9][C@@H:8]([C:5]4[CH:4]=[CH:3][C:2]([Cl:1])=[CH:7][CH:6]=4)[CH2:13][CH2:12]3)[C:15](=[O:26])[C:16]=2[CH:17]=1)=[O:25]6.0 g of trans-2-[4-(4-chlorophenyl)cyclohexyl]-3-chloro-1,4-naphthoquinone (trans-isomer of Formula IV) as obtained in Example 3 was suspended in 120 ml methanol. 6.0 g sodium hydroxide dissolved in 60 ml water was added drop-wise to the suspension under heating over a period of 20 minutes. Further, it was refluxed for 45 minutes and cooled to 0-5° C. and filtered. The filtrate was acidified with 50% aqueous hydrochloric acid to precipitate the product. The precipitated product was filtered, and recrystallized from acetonitrile to obtain 4 g (70% yield) atovaquone.
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