Catalytic effect of wet molecular sieve 3Å in dry media on syntheses of oximes and 1,3-dioximes

A simple, efficient and eco-friendly method has been developed for the condensation of hydroxylamine hydrochloride with aldehydes, ketones and 1,3-diketones in the presence of powdered molecular sieves (3A) as catalyst.Aldoximes, ketoximes and 1,3-dioximes were obtained in excellent yields.