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A mixture of N,N,2-trimethyl-3-thiophenemethanamine (6.1 g), paraformaldehyde (3.0 g) in conc. hydrochloric acid (20 ml) and acetic acid (45 ml) was stirred at 0° to 5° C. for 1 hour, and at 8° for 72 hours. The mixture was added to an ice-cold, saturated solution of sodium carbonate. Aqueous 5 M sodium hydroxide was added and the mixture was stirred for 20 hours. The solution was extracted with chloroform and the organic extract was washed with dilute sodium hydroxide and saturated brine, dried and evaporated to leave an oil. This residue was distilled to give the title compound (6 g) as a pale yellow oil b.p. 120°/0.1 mm. The oxalate salt was formed in ethanol and ethyl acetate m.p. 129°-131° C.

1. waitat 8° for 72 hours
2. stirringthe mixture was stirred for 20 hours
3. extractionThe solution was extracted with chloroform
4. extractionthe organic extract
5. washwas washed with dilute sodium hydroxide and saturated brine
6. customdried
7. customevaporated
8. customto leave an oil
9. distillationThis residue was distilled