Chemische Berichte

Cyclopropan??Derivate, 2. Selbst??Acylierung der α??Alkyl?螃摸?lactone zu Herstellung von Bis (1??alkylcyclopropyl) ketonen über Spiro [4.4] acetale

G Böhrer, R Knorr, P Böhrer

Index: Boehrer, Gerald; Knorr, Rudolf; Boehrer, Petra Chemische Berichte, 1990 , vol. 123, # 11 p. 2161 - 2166

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Citation Number: 4

Abstract

High-yield synthetic ways are recommended for the title lac-ing substituents. Symmetrically substituted bis (1-alkylcyclotones 1. The coupling of two 2-alkyl-4-butanolides is possible propy1) ketones 12 and 13 may be prepared by acidic cleavage in an inter-(1 b, c) or intramolecular fashion (4c) to give of those spiro [4.4] acetals lacking 2,?-substituents. spiro [4.4] acetals 8 or 9, respectively, in the absence of hinder-