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- An efficient novel synthesis of β-(azuleno[1,2-b]benzothienyl)- and β-(azuleno[2,1-b]benzothienyl)-α,β-unsaturated ketones by the tropylium ion-mediated intramolecular furan ring-opening reaction and X-ray investigation of methyl ketone derivative1. Kimiaki Yamamura, Yuuko Houda, Masao Hashimoto, Takatomo Kimura, Makoto Kamezawa, Takehiko Otani
, Org. Biomol. Chem.
, 2004
, 2
, 1413