Sulphated yttria–zirconia as a regioselective catalyst system for the alcoholysis of epoxides

Abstract

It has been reported that sulphated yttria-zirconia efficiently catalysed the epoxide ring opening with a variety of alcohols under solvent free conditions to give corresponding b-alkoxy alcohols. In most of the cases reaction of epoxides with 11, 21 and 31 alcohols in the presence of catalytic amounts of SO 4 2À /Y x Zr 1Àx O 2 gives exclusively one regioisomer with excellent yields. The catalysts were characterized by XRD, SEM/EDAX, total acidity and TGA. The protocol is highly efficient, regioselective, atom economical, greener and applicable for a wide range of aliphatic and aromatic epoxides and alcohols with excellent yields of the corresponding b-alkoxy alcohols. The catalysts show reusability for up to four consecutive catalytic cycles without any significant loss of catalytic activity.

Ring-Opening of Oxiranes using Taeniolite-Supported Tris(β-Diketonato)Zirconium

“…Modified Lewis acid complexes based on salen [5,12] and porphyrin [23] ligands have also been reported. Some heterogeneous catalysts such as zeolites [1,18], monmorillonite K-10 [4], silica gel [6], mesoporous aluminosilicate [9,12,14,15,20], CuO/SiO 2 [19], and sulphated yttria-zirconia [25] have been reported as catalysts in the ring-opening of oxiranes. An alternative reaction method using a microwave technique has also been examined [13], even though such a method still experiences difficulties in scale-up processes.…”

Synthesis and Characterization of Monodispersed β-Ga2O3 Nanospheres via Morphology Controlled Ga4(OH)10SO4 Precursors

“…The vibration modes of the β-Ga 2 O 3 NSs are attributed to the symmetric stretching of the SO (1106 cm −1 ) vibrations by the strong bond with Ga(OH) 3 during the forced hydrolysis treatment. 25 The results suggest that the component of the prepared S2 consists of Ga 4 (OH) 10 SO 4 . With increasing firing temperatures, the absorption peak at 1106 cm −1 was drastically decreased.…”

A novel route to synthesis of glycerol dimethyl ether from epichlorohydrin with high selectivity

“…/Y x Zr 1-x O 2 [29], Co-T(p-OMe)PP-SbF 6 [30], SBA-15-pr-SH [31], Nano-ZSM-5 [32], Ext-SBA-15-en-Fe(III) [33], and so on [34,35]. However, the studies of high selective producing the aalkoxy alcohols are scarce.…”