Zur Herstellung von 4-Fluorenonen—eine intramolekulare Ringschlußreaktion am Indenylanion

D Binder, CR Noe

Index: Binder,D.; Noe,C.R. Monatshefte fuer Chemie, 1976 , vol. 107, p. 1145 - 1151

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Citation Number: 3

Abstract

Abstract A convenient synthesis of 4-oxofluorenes starting from 1-oxo-2-indan-butyric acid (1 a) is described. Esterification of 1 a, subsequent reduction of the oxo group and elimination of the resulting hydroxy group lead to ethyl 2-inden-butyrate (3 a), which is subjected to intramolecular ring closure using NaH as condensating agent. Nitration and hydrogenation products of the resulting 1, 2, 3, 9-tetrahydro-4-fluorenone (4 a) are described.