Synthesis of dibenzo 14-crown-4 double-chain surfactant
Crown ether surfactants are composed of crown ether as hydrophilic group linked to lipophilic long alkyl group,and are widely used in phase transfer catalysis,metal ion extraction and membrane separation due to their ion complexing ability.Compared with single-chain surfactant,double-chain surfactant has unique interface proper-ties due to their unique structure.In order to prepare a crown ether double-chain surfactant,the nucleophilic substitution reaction of 1,2-Dihydroxybenzene and 1,3-dibromopropane was used to produce the intermediate dibenzo-14-crown-4,the crown ether surfactant D12-DB14C4 was prepared by acylation and oxidative rearrangement,which introduced an es-ter group to the benzene ring of the crown ether intermediate.D12-DB14C4 and its intermediate were characterized by NMR and IR,and the structure of the product was confirmed.The product D12-DB14C4 has high purity and yield of 70％,which provides a new possibility for its application in more fields.
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