[CH3:1][N:2]1[CH2:7][CH:6]2[C:4]([C:8]#N)([CH2:5]2)[CH2:3]1.[OH-:10].[K+].[OH2:12]>>[CH3:1][N:2]1[CH2:7][CH:6]2[C:4]([C:8]([OH:12])=[O:10])([CH2:5]2)[CH2:3]1A solution of 10 g of 3-methyl-3-azabicyclo[3.1.0]-hexane-1-carbonitrile is 60 ml of saturated ethanolic KOH and 20 ml of water is boiled under reflux for 15 hours. After neutralization with hydrochloric acid the mixture is evaporated and the title compound is extracted from the resultant dried residue with hot absolute ethanol (M.P. 193°-195°).
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