Ethylparaben → 4-(6-Hydroxyhexyloxy)benzoic acid

Participants

Reaction Conditions

Reaction Steps

Ethyl p-hydroxybenzoate (33.2 g), 6-bromohexanol (54.3 g), potassium carbonate (41.5 g) and N,N-dimethylacetamide (200 mL) were put into a 500-mL three-neck flask, and stirred at 120° C. for 5 hours. After cooled, the reaction mixture was poured into water (200 mL), extracted with ethyl acetate (500 mL), and washed two times with water (100 mL). This was dried with anhydrous magnesium sulfate, and filtered. The solvent was removed through concentration under reduced pressure, the residue was dissolved in methanol (100 mL), and a methanol solution (20 mL) of potassium hydroxide (16.8 g) was dropwise and gradually added thereto, and heated under reflux for 2 hours. After cooled, the formed crystal was collected through filtration and dissolved in water (1 L). Concentrated hydrochloric acid (25.7 mL) was added thereto, and the precipitated crystal was collected through filtration under reduced pressure, and washed with water. This was dried to give 4-(6-hydroxyhexyloxy)benzoic acid (61.5 g, 86%). 4-(6-Hydroxyhexyloxy)benzoic acid (9.53 g), N,N-dimethylaniline (5.33 g) and dioxane (100 mL) were put into a 300-mL three-neck flask, and acrylic acid chloride (3.98 g) was gradually and dropwise added thereto at 60° C. and stirred for 6 hours. After cooled, this was poured into water with ice (200 mL), and the precipitated crystal was collected through filtration under suction, washed with hexane and dried to give TP-55C (9.4 g, 80%). Production of 2,3,6,7,10,11-hexa(4-(6-acryloyloxyhexyloxy)benzoyloxy)triphenylene (TP-55):

Provenance & Evidence