Ethylene Glycol → Benzyl oximino-acetoacetate ethylene ketal

Participants

Reaction Steps

In a two liter flask fitted with a Dean Stark water separator and a condenser were placed 186.5 g. (0.85 mole) of benzyl oximino-acetoacetate (17), 62 g. (1 mole) of ethylene glycol, 800 ml. of benzene (reagent grade) and 2 g. of toluenesulfonic acid. The reaction mixture was boiled at reflux until 15 ml. of water was removed (3 hours). The benzene solution was washed once with saturated sodium bicarbonate solution and once with brine. After drying over anhydrous sodium sulfate, the benzene solution was evaporated, leaving 212 g. (94%) of 17 as a light yellow oil. Its NMR spectrum was consistent with the assigned structure. Generally the compound was used as used in subsequent reaction but one of the isomers can be crystallized in 35% yield from toluene-petroleum ether, m.p. 52° C. ##STR144##

Provenance & Evidence