ethyl (E)-3-(3,4-dihydroxyphenyl)prop-2-enoate

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: Ethyl caffeate was prepared as follows. Caffeic acid (1 g) was boiled under reflux in absolute ethanol (30 ml) in the presence of concentrated sulphuric acid (0.5 ml) for two hours. The reaction mixture was then poured into water (100 ml), and then ethyl acetate (100 ml) and 0.1M sodium bicarbonate solution (100 ml) were added. The organic phase was washed successively with 0.1M sodium bicarbonate solution (3×100 ml) and water (2×100 ml) before being dried (sodium sulphate, anhydrous), filtered and evaporated under vacuum to yield a tan coloured crystalline solid. The product was recrystallised from water giving ethyl caffeate as a tan coloured powder in 43% yield. mp 142-143° C. Ethyl caffeate was prepared The organic phase was washed successively with 0.1M sodium bicarbonate solution (3×100 ml) and water (2×100 ml) before being dried (sodium sulphate, anhydrous) filtered evaporated under vacuum to yield a tan coloured crystalline solid The product was recrystallised from water

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: Ethyl caffeate was prepared as follows. Caffeic acid (1 g) was boiled under reflux in absolute ethanol (30 ml) in the presence of concentrated sulphuric acid (0.5 ml) for two hours. The reaction mixture was then poured into water (100 ml), and then ethyl acetate (100 ml) and 0.1M sodium bicarbonate solution (100 ml) were added. The organic phase was washed successively with 0.1M sodium bicarbonate solution (3×100 ml) and water (2×100 ml) before being dried (sodium sulphate, anhydrous), filtered and evaporated under vacuum to yield a tan coloured crystalline solid. The product was recrystallised from water giving ethyl caffeate as a tan coloured powder in 43% yield. mp 142-143° C. Ethyl caffeate was prepared The organic phase was washed successively with 0.1M sodium bicarbonate solution (3×100 ml) and water (2×100 ml) before being dried (sodium sulphate, anhydrous) filtered evaporated under vacuum to yield a tan coloured crystalline solid The product was recrystallised from water

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: Ethyl caffeate was prepared as follows. Caffeic acid (1 g) was boiled under reflux in absolute ethanol (30 ml) in the presence of concentrated sulphuric acid (0.5 ml) for two hours. The reaction mixture was then poured into water (100 ml), and then ethyl acetate (100 ml) and 0.1M sodium bicarbonate solution (100 ml) were added. The organic phase was washed successively with 0.1M sodium bicarbonate solution (3×100 ml) and water (2×100 ml) before being dried (sodium sulphate, anhydrous), filtered and evaporated under vacuum to yield a tan coloured crystalline solid. The product was recrystallised from water giving ethyl caffeate as a tan coloured powder in 43% yield. mp 142-143° C. Ethyl caffeate was prepared The organic phase was washed successively with 0.1M sodium bicarbonate solution (3×100 ml) and water (2×100 ml) before being dried (sodium sulphate, anhydrous) filtered evaporated under vacuum to yield a tan coloured crystalline solid The product was recrystallised from water