0-(1-Methyl-,-benzyl-, and phenylthioalky1) hydroxylamines la-e were synthesized by solvolysis of the corresponding N-(1-methyl-, benzyl-, and-phenylthioalkoxy) phthalimides Sa-e. The (I-methyl-,-benzyl-, and-phenylthioalkoxy) oximes, 7a-e, of the cyclopentanone