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100 g adipinic acid and 100 ml acetanhydride were refluxed for 5 hours. The solvent was removed at a rotovap and 100 ml acetonitrile were added to the residue and the mixture was kept in a freezer over night. Then the mixture was fritted and the resulting residue was washed with 50 ml acetonitrile and dried.

1. customThe solvent was removed at a rotovap and 100 ml acetonitrile
2. additionwere added to the residue
3. waitthe mixture was kept in a freezer over night
4. washthe resulting residue was washed with 50 ml acetonitrile
5. customdried