Methylglyoxal → HCID 11298738, compound

Participants

Reaction Conditions

Reaction Steps

A 40% strength solution of 61.56 g of pyruvaldehyde in water (342 mmol) in 100 ml of water is added by slow dropwise addition INto a solution of 60.66 g (342 mmol) of triethylenetetraamine hydrate (containing 17% water) in 300 ml of distilled water cooled to 2° C. On completion of addition, the reaction mixture is adjusted to ambient temperature and 81.40 g (684 mmol) of benzotriazole are added in a single portion. 300 ml of ethanol are then added to the reaction medium, then a solution of 49.59 g of glyoxal (40% in water) (342 mmol) in 100 ml of ethanol is added by slow dropwise addition. After 2 h of stirring at ambient temperature, the solution is cooled to 0° C. and 25.87 g (684 mmol) of NaBH4 are added in small portions. After returning to ambient temperature, the reaction medium is stirred for 2 h, the ethanol is evaporated and 70 g of KOH pellets are added to the residue. The solution is then extracted with two 1 l portions of chloroform. After drying over MgSO4 and evaporation of the solvents, (IIb) is isolated in the form of an orange oil (32.3 g; yield=45%).

Provenance & Evidence