par Lambert, Hasso P.;Martin, Richard
Référence Bulletin des Sociétés chimiques belges, 61, 3-4, page (132-138)
Publication Publié, 1952
Article révisé par les pairs
Résumé : Summary. ‐ We have shown that: The cyclisation of ß‐(1‐naphthoyl)‐acrylic acid (I) with conc. sulfuric acid at room temperature gives a nearly quantitative yield of 4,5‐benzindane‐3‐one‐1‐carboxylic acid (IIIa). 6,7‐benzindane‐3‐one‐1‐carboxylic acid (IVa) is formed when a mixture of naphthalene and maleic anhydride is heated at 160° with aluminium chloride and sodium chloride. (IVa) is also formed, although in small yield only (15%), by cyclisation of ß‐(2‐naphthoyl)‐acrylic acid with conc. sulfuric acid at room temperature. Both (IIIa) and (IVa) loose CO2 when heated above their melting points to give 4,5‐benzindane‐3‐one and 6,7‐benzindane‐3‐one respectively. Copyright © 1952 Wiley‐VCH Verlag GmbH & Co. KGaA, Weinheim