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synthesis, a mixture of Pluronic F127 (5.0 g), aqueous HCl (3.0 g of 35 wt %
solution), and distilled H2O (240 mL) was stirred for 2–3 h at 45 °C.
Tetraethylorthosilicate (TEOS) (24.0 g) and the required amounts of
aluminum isopropoxide and iron nitrate were added, and the reaction
mixture was stirred at 45 °C for 24 h and then hydrothermally treated under
static conditions at 100 °C for 24 h. The resulting solid was filtered (without
washing with H2O), dried at 100 °C, and finally calcined at 540 °C for 10 h.
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cyclohexane at reflux temperature. The reaction was monitored by thin layer
chromatography. After completion, the catalyst was recovered by filtration.
The organic layer was concentrated and the crude product purified by silica gel
column chromatography using EtOAc–n-hexane (1:9) as eluent to afford the
product 3a–g.
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General procedure for the synthesis of 1,1-diarylalkenes 3h–l: A mixture of
phenol (2 mmol), arylacetylene (1 mmol), and FeAl-KIT-5 (40 mg) was stirred
in cyclohexane at reflux temperature. The reaction was monitored by thin layer
chromatography. After completion, the catalyst was recovered by filtration.
The organic layer was concentrated and the crude product purified by silica gel
column chromatography using EtOAc–n-hexane (1:9) as eluent to afford the
product 3h–l.