... Tetrahedron Letters. ... m 2 /g (Kieselgel 60 has a surface area of 458 m 2 /g) and the catalyst has a single point total pore volume of 0.461 ... mmol) and acetic anhydride (5 mmol) was added supported cobalt(II) catalyst 1 (0.01 mmol, 0.33 g) and the mixture was stirred at 50 °C. After ...