Magnesium Hydrogensulfate [Mg(HSO₄)₂] as an Efficient Catalyst for the Preparation of Silyl Ethers, Dibenzo[a,j]xanthenes, and Octahydroxanthene Derivatives

Abstract

Magnesium hydrogensulfate [Mg(HSO₄)₂], as a heterogeneous solid acid catalyst, has been used for the mild formation of trimethylsilyl (TMS) ethers from various primary, secondary, and tertiary aliphatic alcohols; aromatic alcohols; and oximes using hexamethyldisilazane (HMDS) under ambient conditions. In addition, 14-aryl-14H-dibenzo[a,j]xanthenes and 1,8-dioxo-octahydroxanthene derivatives were synthesized in the presence of Mg(HSO₄)₂ with short reaction times in high to excellent yield under solvent-free conditions.

Keywords:

• Dibenzo[a,j]xanthene
• 1,8-dioxo-octahydroxanthene
• heterogeneous catalyst
• hexamethyldisilazane
• Mg(HSO₄)₂
• trimethylsilyl ether

Acknowledgments

We are thankful to the Sistan and Baluchestan University Research Council for the partial support of this research.

Notes

^aIsolated yield, and the product gave satisfactory IR and NMR spectra.