Chemoselective Thioacetalization Using 3-(1,3-Dithian-2-ylidene)pentane-2,4-dione as an Odorless and Efficient Propane-1,3-dithiol Equivalent under Solvent-Free Conditions
equivalent, 1 was investigated in the thioacetalization reaction. Various types of aldehydes and ketones 3 were converted to the corresponding dithianes 4 in the presence of 1 in high yields (79-97%). Moreover, 1 exhibited obvious chemoselectivity betweenaldehyde and ketone in this thioacetalization reaction. A mechanism for this thioacetalization reaction is proposed.
Phosphorus pentoxide supported on silica gel (P2O5/SiO2) efficiently acts as a highly active and reusable catalyst for cyclic and non-cyclic S,S-acetalization of a variety of carbonyl compounds under mild, solvent-free and ambient conditions. This method offers significant advantages such as high conversion, clean work-up, short reaction times and simplicity in operation.[GRAPHICS].
Chemoselective Thioacetalization in Water: 3-(1,3-Dithian-2-ylidene)pentane- 2,4-dione as an Odorless, Efficient, and Practical Thioacetalization Reagent
A chemoselective thioacetalization utilizing 3-(1,3-dithian-2-ylidene)pentane-2,4-dione as a novel nonthiolic, odorless 1,3-propanedithiol equivalent catalyzed by p-dodecylbenzenesulfonic acid in water has been developed.