A GENERAL ALTERNATIVE TO OBTAIN S.S-ACETALS USING TAFF, A BENTONITIC CLAY, AS THE CATALYST^*

Abstract

A one-pot general alternative to prepare dithioacetals, with excellent yields, via the condensation of 1,3-propanedithiol, benzyl, and n-butyl mercapthanes with several carbonylic compounds using a bentonitic earth as the catalyst is proposed. Also, the acidic role of the clay in the reaction is discussed. The product structures were established by ¹H and ¹³C NMR, as well as by the corresponding EIMS and HRMS data.

To the memory of Professor Álvaro Leo Ramírez.

ACKNOWLEDGMENTS

We thank Ing. Luis Velasco and MSc Javier Pérez for recording the MS experiments. Cont ract/grant sponsor: DGAPA-UNAM. Contract / grant number PAPIIT-IN215598 and CONACYT-UNAM Contract/grant number CONACyT 25267-A.

Notes

To the memory of Professor Álvaro Leo Ramírez.