were added to 30 mL of n-butanol in a 100 mL round-bottom flask and heated to 117 °C for 4-6 h. Then, 3.60 g of titanium (IV) butoxide was added to the flask and the set temperature was maintained for an additional 1 h. After this, the flask was purged with argon and left overnight. Then, the mixture was centrifuged and supernatant was collected. The chemical structure of the obtained catalyst was characterized using NMR (SI Figure ).