C1O[C:4]([CH:17](Br)[CH3:18])([CH2:5][N:6]2[C:10](=[O:11])[C:9]3=[CH:12][CH:13]=[CH:14][CH:15]=[C:8]3[C:7]2=[O:16])[O:3]C1.[N-:21]=[N+:22]=[N-:23].[Na+]>CS(C)=O>[C:10]1(=[O:11])[N:6]([CH2:5][C:4](=[O:3])[CH:17]([N:21]=[N+:22]=[N-:23])[CH3:18])[C:7](=[O:16])[C:8]2=[CH:15][CH:14]=[CH:13][CH:12]=[C:9]12In the manner given in example 3, 1-phthalimido-3-bromo-2-butanone ethyleneketal in dimethyl sulfoxide is heated with sodium azide to give 1-phthalimido-3-azido-2-butanone, ethylene ketal.
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