Studies on the reactions of ω‐carbethoxy fatty acid sodioesters with brominated compounds

Abstract

Several ~-carbethoxy fatty acid sodioesters (C2~-O2CCHNa(CH2)n.I-CO2C2H s and C2H 5. O2CCHNa(CH2)n.2-CHNaCO2C2H s where n/6, 7, or 8) were condensed with c3-bromoaliphatic esters (Br(CH2)zCO2C2H s where z-5, 8 or 10), t~,co-dibromoalkanes (Br(CH2)n,-Br where n'--4, 6 or 8) and t~,t~'-dibromo m-or p-xylene. Tri-and tetraesters and several carbethoxy cycloheptanones which arose mainly from Dieckmann type condensations were isolated. The infrared spectra of the tri-and tetraesters were compared with those of their parent co-carbethoxy fatty acid ester and additional peaks in the regions of Vc= O and VC_O_ C were observed. Reactions involving the formation of both the a-sodio and a,t~'-disodiodiester salts are also discussed.