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a
,b-unsaturated carbonyl compounds with
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K3PO4ꢀH2O (0.75 mmol), and Ni(ClO4)2ꢀ6H2O (5 mol %, relative to aldehyde) in
3 mL of toluene/IPA = 5:1 was stirred at 80 °C under a nitrogen atmosphere for
7–14 h. The reaction progress was monitored by TLC, and aldehyde
disappeared after 7–14 h. When the reaction completed, the mixture was
cooled to room temperature, then was quenched with water and extracted
with ethyl acetate. The combined extracts were washed with brine, dried over
sodium sulfate, and concentrated under vacuum. The residue was purified by
silica gel column (petroleum ether/ethyl acetate = 10:1 to 5:1) to give
diarylmethanols in good to excellent yields.