Abstract
The Friedel–Crafts acylation of ferrocene catalyzed by a new type of catalyst of rare-earth solid superacid sulfated zirconia SZR3+ was developed. Comparison of catalytic activities between different solid acid catalysts is presented. The catalyst, sulfated zirconia ytterbium SZNYb3+, showed interesting catalytic properties for preparation of acylferrocenes. Furthermore, the catalyst could be regenerated and reused in succession after simple filtration.
GRAPHICAL ABSTRACT
ACKNOWLEDGMENT
The project is generously supported by the Natural Science Foundation of Inner Mongolia of China (No. 20080404ZD04).
Notes
a All the reactions were performed in a 1:2 molar ratio of ferrocene (2 mmol) and the acylchloride in dichloroethane under reflux temperature.
b Yield of isolated product after chromatography, calculated based on the reacted ferrocene.
a All the reactions were performed in a 1:2 molar ratio of ferrocene (2 mmol) and heptanoyl chloride in dichloroethane under reflux temperature.
b Yield of isolated product after chromatography, calculated based on the reacted ferrocene.
a Yield of isolated product after chromatography, calculated based on the reacted ferrocene.
a All the reactions were performed in a 1:2 molar ratio of ferrocene (2 mmol) and the heptanoyl chloride in dichloroethane under reflux temperature.
b Yield of isolated product after chromatography, calculated based on the reacted ferrocene.