Entry Catalyst (mol%) Solvent Time (h) Yield (%)a 1 H2SO4 10 BnOH 24 2 HClO4 10 BnOH 24 3 H2SO4-SiO2 10 BnOH 24 4 HClO4 12 27 35 5 HClO4 -SiO2 10 BnOH 24 10 ...
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