HCID 3035543, compound → HCID 6509858, compound

Participants

Reaction Steps

The isomer mixture product of example 2 is dissolved in 1 l boiling 95% ethanol, seeded with crystals of the pure (Z) isomer obtained in accordance with example (5a1) above and allowed to cool slowly with stirring. After standing for 20 hours the yellow crystal mass is filtered off and pressed. The pure (Z)-[10-methoxy-4H-benzo[4,5]cyclohepta[1,2-b]thiophen-4-ylidene]-acetic acid is obtained following re-crystallisation from ethanol: m.p.=184°-187° C.

Provenance & Evidence