Macroheterocycles. 7. Synthesis and extraction capacity of some dibenzo-18-crown-6-derivatives

Derivatives that contain vinyl, formyl, acetyl, carboxy, carbethoxy, β-carboxyvinyl, or β-carbethoxyvinyl groups in the benzene rings were synthesized from dibenzo-18-crown-6. The ability of the synthesized crown ethers to extract picrates of alkali metals from the aqueous phase to the chloroform phase was investigated.