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Relevant academic research and scientific papers

A solvent free method for preparation of β-amino alcohols by ring opening of epoxides with amines using MCM-22 as a catalyst

β-amino alcohols were synthesized at room temperature employing microporous MCM-22 zeolite as catalyst in an eco-friendly manner without using solvent. The zeolite MCM-22 showed promising activity for the conversion of primary and secondary amines into β-amino alcohols under mild reaction conditions. The catalytic activity remains intact for three recycles.

Solvent-free aminolysis of aliphatic and aryloxy epoxides with sulfated zirconia as solid acid catalyst

Single-step and two-steps synthetic procedure for the synthesis of sulfated zirconia (SZ) was developed, which were calcined at 500, 600 and 700 °C and characterized by various physico-chemical methods such as PXRD, FTIR, surface area, microanalysis, NH3-TPD and DRIFT analysis. These SZ materials were then employed as solid acid catalysts for the aminolysis of different aliphatic/aromatic terminal, aryloxy and meso epoxides with aromatic and aliphatic amines under ambient conditions. Amongst the catalyst prepared, SZ-2-600 prepared in two-steps and 600 ° C calcined was found to be the most efficient catalyst to give p-amino alcohols in up to 98% yield and 7gt;99% regioselectivity. The SZ catalyst was successfully recycled and reused up to six catalytic runs with intact efficiency.

Fe(Cp)2BF4: An efficient lewis acid catalyst for the aminolysis of epoxides

Ferrocenium tetrafluoroborate [Fe(Cp)2BF4] is an efficient Lewis acid catalyst for the aminolysis of aromatic, aliphatic, and cyclic epoxides using aniline and substituted anilines as the nucleophile to provide regioselective β-amino alcohols in 61-97% yields under solvent-free conditions at room temperature. The ring opening of cyclohexene oxide with aliphatic amines gave 2-aminocyclohexanols in 33-98% yields at 60 °C under solvent-free conditions. Georg Thieme Verlag Stuttgart New York.

Hot water as a mild Bronsted acid catalyst in ring opening reactions of epoxides

Ring opening of extremely hydrophobic epoxides with water, amines, sodium azide and thiophenol was realized in the mixture solvent of water and 1, 4-dioxane under reflux condition. Hot water was believed to act as a mild Bronsted acid catalyst in the epoxide-opening reactions.

Thiourea catalyzed aminolysis of epoxides under solvent free conditions. Electronic control of regioselective ring opening

A reactant economizing process for the regioselective aminolysis of epoxides using equimolar quantities of reactants catalyzed by the double hydrogen bond donor N,N′-bis[3,5-bis(trifluoromethyl)phenyl]thiourea is reported. Regioselectivity of the reaction

Hβ zeolite: An efficient and reusable catalyst for ring-opening of epoxides with amines under microwave irradiation

A solvent-free protocol for the synthesis of β-amino alcohols (Yield, up to 94%) is demonstrated by the ring-opening reactions of meso and terminal epoxides with aromatic amines using Hβ zeolite as catalyst under microwave irradiation. The catalytic syste

Zirconium sulfophenyl phosphonate as a heterogeneous catalyst in the preparation of β-amino alcohols from epoxides

A convenient method for the ring opening of epoxides by aromatic amines, catalysed by zirconium sulfophenyl phosphonate in solvent-free conditions, is described.