What is "thienone"

Thienone \Thi"["e]*none\, n. [Thi["e]nyl + ketone.] (Chem.) A ketone derivative of thiophene obtained as a white crystalline substance, (C4H3S)2.CO, by the action of aluminum chloride and carbonyl chloride on thiophene.

n. (context organic compound English) A ketone derivative of thiophene obtained as a white crystalline substance, C₄H₃S)₂.CO, by the action of aluminium chloride and carbonyl chloride on thiophene.