p-Toluenesulfonic acid → HCID 178498595, compound

Participants

Reaction Steps

To a solution of (E)-2-(N-methyl-hydrazino)-but-2-enedioic acid dimethyl ester (12.2 g, 65 mmol) in xylene (65 mL) was added para-toluenesulfonic acid (0.9 g, 4.7 mmol) and the resulting mixture heated at reflux for 6 h. After cooling to room temperature the mixture was stirred overnight and the resulting solid was filtered off and dissolved in ethyl acetate and the organic extract washed with sodium hydrogen carbonate, brine, dried over sodium sulfate, filtered and concentrated to afford the title compound (7.49, 74%) as a light brown solid after trituration with diisopropylether. MS: m/e=157.2 [M+H]+.

Provenance & Evidence