O-(Tetrahydro-2H-pyran-2-yl)hydroxylamine (CAS 6723-30-4, C₅H₁₁NO₂) is an O-substituted hydroxylamine commonly used in organic synthesis. It acts as a versatile protecting group reagent for carbonyl compounds (aldehydes and ketones) and as a reagent for synthesizing marine alkaloids. Purity>98%.