1: Amberlyst .(R).-15 / tetrahydrofuran / 8 h / 79.84 °C / 15514.9 Torr / Inert atmosphere 2: 4-hydroxy-6-methyl-tetrahydro-2H-pyran-2-one / Amberlyst.(R).-70 / water; tetrahydrofuran / 12 h / 169.84 °C / 15514.9 Torr / Inert atmosphere View Scheme

1: p-toluenesulphonic acid / benzene / Heating 2: H2 / 10 percent Pd-C / ethyl acetate / 760 Torr / Ambient temperature View Scheme

Amberlyst.(R).-70 in tetrahydrofuran; water T=169.84°C; P=15514.9 Torr; 12 h; Inert atmosphere; Product distribution / selectivity;

in water T=169.84°C; P=15751.6 Torr; 12 h; Inert atmosphereFlow reactor; Reagent/catalystSolventTime;