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The obtained GO‐ZrPPh was collected by centrifuging at
8000 rpm for 30 min. Finally, water (20 ml) was added
and the mixture was centrifuged at 8000 rpm for 30 min
and the obtained Zr‐complex on the GO was collected.
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The GO‐ZrPPh catalyst (20 mg) was added to a solution of
aromatic aldehydes (1.0 mmol), urea (1.5 mmol, 0.09 g)
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catalyst was separated from the reaction mixture by
centrifuging. Cold water (20 ml) was added to the organic
phase and after stirring for a few minutes, the solid prod-
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