p-Toluenesulfonic acid → HCID 20367281, compound

Participants

Reaction Steps

A solution of 29 g of 4-phenylbenzylhydrazine in 60 ml of ethanol was added dropwise, under nitrogen, to a solution of 23.4 g (0.147 mol) of β-amino-β-ethoxyacrylic acid ethyl ester and 1 g of p-toluenesulphonic acid in 100 ml of ethanol. During addition the temperature rose from 22° to 32°C. After standing overnight, the reaction solution was concentrated in vacuo, the precipitate which separated out was dissolved in 2 N sodium hydroxide solution and the alkaline solution was repeatedly extracted with ether. Addition of dilute acetic acid until the mixture reacted weakly acid yielded the compound identified above, which melted as 185°-186° after recrystallisation from ethanol. 13 g (33%).

Provenance & Evidence