Table 3 18O exchange during cyclohexanol dehydration*.

From: Enhancing the catalytic activity of hydronium ions through constrained environments

Catalyst 18 O in the recovered alcohol (%) Conversion (%)
HBEA 9 19
H3PO4 17 18
  1. *Extent of 18O exchange from H218O (97% isotopic purity) into cyclohexanol during dehydration of unlabelled cyclohexanol (0.30 M in H218O) over HBEA and H3PO4 in aqueous phase at 180 °C.