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
![](/cms/asset/3f161991-7ec1-41f1-ab55-38b559875624/lsyc_a_535942_o_uf0001.gif)
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.