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A solution 3a or 3b (14 mmoles), aldehyde (7 mmoles) and NaBr (8 mmoles)
in 20 ml of alcohol was electrolyzed in the undivided cell equipped with Fe-cathode, Pt- or C-anode at 0 degree under constant current density 100 mA/cm2 until 1.5 F of electricity per mole of 3 was passed. Cyclopropanes Sa, SC + 6c, 6f and 5i are partially crystallized from reaction mixture after the end of electrolysis. The solvent was removed, residue was extracted with acetone, than acetone was evaporated and residue was crystallizedfrom mixture acetone-heptane or distilled. Pure isomers 5 and 6 were isolated by column chromatography on silicagel with eluant ether-heptane mixture .
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haiwenwang

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lijian2007

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haiwenwang

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ajiao1984

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