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40.1 g 6-[(4-nitrobenzoyl)oxy]hexyl 4-nitrobenzoate (96.3 mM) were suspended in 300 ml of ethyl acetate and 300 ml of THF and 4.0 g of palladium on charcoal (10%) were added. The resulting mixture was hydrogenated at atmospheric pressure until the theoretical amount of hydrogen was consumed. The mixture was then filtered, the cake was washed with DMF and the filtrate was evaporated. The residue was suspended in 200 of cyclohexane. It was stirred for 30 min. and then the solids were filtered off, washed with cyclohexane and dried to give 33.2 g (93.1 mM, 97%) of 6-[(4-aminobenzoyl)oxy]hexyl 4-aminobenzoate as beige crystals.

1. customwas consumed
2. filtrationThe mixture was then filtered
3. washthe cake was washed with DMF
4. customthe filtrate was evaporated
5. filtrationthe solids were filtered off
6. washwashed with cyclohexane
7. customdried