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3-Chlorobenzo[b]thiophene-2-carbonyl chloride was synthesised from cinnamic acid and thionyl chloride. The single crystal X-ray structure determination confirmed the earlier proposed structure and the product was further characterised by 1H NMR, 13C NMR and mass spectrometry. The X-ray structure determination revealed two sets of symmetry related molecules along the b-axis that are loosely connected by relatively weak CH…π (3.626, 3.628 Å) interactions, giving rise to two infinite chains.The packing structure is dominated by Van der Waals forces between these chains. No significant π–π interactions are found in the crystal structure.