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Dithioacetalization, as a well-known class of organic transformation, was carried out for protection of a wide variety of aromatic (with electron releasing and electron withdrawing substituents), heteroaromatic and aliphatic aldehydes as well as ketones by 1,2-ethanedithiol/or 1,3-propanedithiol in the presence of Fe 3 O 4 @MCM-41-GPTMS-Gu-Cu II NPs. The corresponding 1,3-dithiolanes and 1,3-dithianes were obtained chemoselectively in the presence of Fe 3 O 4 @MCM-41-GPTMS-Gu-Cu II NPs with hexagonal core-shell structure, superparamagnetic behavior, and average particle size of 8–25 nm under mild reaction conditions. The nanostructured catalyst could be separated easily from the reaction mixture using a magnetic bar and reused in several reaction runs without any remarkable reduction in its catalytic activity. Nearly neutral conditions, good to high yields of the products, operational simplicity, easy work-up procedure, compatibility with various functional groups make the present method valuable in addition to the known methodologies.

phosphorus, sulfur, and silicon and the related elements

Facile chemoselective dithioacetalization of carbonyl compounds promoted by Fe 3 O 4 @MCM-41-GPTMS-Gu-Cu II NPs as an efficient magnetic nanostructured catalyst