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Primary–secondary dibromides have been prepared from the corresponding diols and used with carbon acids to prepare 1,2-disubstituted cyclic compounds. With unsymmetrical carbon acid in presence of NaH in DME, a high diastereoselection of the trans isomer is observed. Factors that affect the stereoselectivity are proposed. Keywords: intramolecular S N 2, decarboxylation, 2-alkylcycloalkanecarboxylic acids, 1-alkylindan-2-carboxylic acids.

Étude de l'annélation à partir de dérivés dibromomés-1,4 et -1,5 en présence de carbanions