Dimethyl acetylenedicarboxylate → HCID 12918161, compound

Participants

Reaction Steps

Dimethyl acetylenedicarboxylate (42.63 g, 0.4 mol) and 5-(p-cyanophenyl)-1,3,4-oxathiazol-2-one (20.42 g, 0.1 mol) were heated at reflux in o-dichlorobenzene for 10 hours. Volatile materials were removed under reduced pressure (1 mm). The red-brown residue contained at least three contaminants (g.c.) which were removed by crystallization from methanol. Four recrystallizations resulted in 18.1 g (0.0598 mol, 59%) of light yellow solid, m.p. 134°-135°.

Provenance & Evidence