反应详情

To a 100 ml round bottom flask equipped with Teflon coated stir magnetic and a condenser was charged 1 g squaric acid (MW=114) and 45 g butanol. The round bottom flask was placed in an 80° C. oil bath. After the squaric acid dissolved, 4.0 g of the hydroxyethyl perimidine was added, as shown in the reaction below. The reaction progress was monitored by uv-vis spectrum. The peak at about 812 nm grew and peak at 354 decreased. The reaction was stopped when the 812 nm peak was considered maximized.

1. customwas placed in an 80° C.
2. customas shown in the reaction below