In a beaker dissolve 5.7 g of 5-Iodoethylvanillin in 20 mL of ethanol, immerse the beaker in an ice bath and a slow addition of 0.75 g of sodium borohydride dissolved in 5.7 ml of 1M NaOH is started with stirring. The temperature should be maintained below 20°C. The mixture should be stirred for 1h after the addition thereafter filter and wash with some cold water. Dry in the open air and recrystallize with hot ethanol.
Addition of the borohydride solution
The mixture after the addition and stirring
The pure product