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2.185 g (52.07 mmol) of lithium hydroxide were added to a suspension of 10.79 g (26.04 mmol) of 2,2-dimethyl-5,5-bis(4-nitrobenzyl)-1,3-dioxane-4,6-dione and 110 ml mixture of tetrahydrofuran:water 9:1. The mixture was subsequently allowed to react for 21.5 hours at 25° C., added to 500 ml water and acidified to pH=1 with 20 ml hydrochloric acid 3N. The mixture was partitioned between water and ethyl acetate; the organic phase was washed repeatedly with water, dried over sodium sulfate, filtered and concentrated by rotary evaporation. The residue 9.54 g (98%) of 2,2-bis(4-nitrobenzyl)malonic acid as white powder was used without further purification.

1. customto react for 21.5 hours at 25° C.
2. customThe mixture was partitioned between water and ethyl acetate
3. washthe organic phase was washed repeatedly with water
4. dry with materialdried over sodium sulfate
5. filtrationfiltered
6. concentrationconcentrated by rotary evaporation
7. customThe residue 9.54 g (98%) of 2,2-bis(4-nitrobenzyl)malonic acid as white powder was used without further purification