Acetic Anhydride → Methyl 3-formyl-3-pentylacrylate

Beteiligte Stoffe

Reaktionsbedingungen

Reaktionsschritte

A mixture of 57 g (0.5 mol) of n-heptanal and 44 g (0.5 mol) of methyl glyoxylate was added dropwise to a mixture of 1.85 g (0.025 mol) of propionic acid and 3.22 g (0.025 mol) of di-n-butylamine in such a way that the temperature did not exceed 80° C. After the addition was complete the mixture was stirred at 80° C. for 30 min, then 102 g (1 mol) of acetic anhydride were added and the mixture was heated to boiling. Acetic acid slowly distilled out, 51 g being obtained in 2 hours. Fractional distillation of the bottom product yielded 59 g of methyl 3-formyl-3-pentylacrylate with a boiling point of 82°-85° C./1 mbar, corresponding to a yield of 64% of theory. The trans/cis isomer ratio was 78/22.

Herkunft & Nachweise