Abstract: Etherification of 3,19-dihydroxy-1-thia-5,8,11,14,17-pentaoxa-cycloicosane with a series of alkyl,alkenyl,and arylalkyl halides takes place smoothly in diglyme and in the presence of NaHas a base. Dihexyloxy,didodecyloxy,dihexyldecyloxy,dibenzyloxy,and diallyloxy thia-20-crown-6 were prepared via the etherification,and four monolariat thiacrovvn ethers were also obtained as by prodticts. A polyester with thiacrown ether moieties incorporated in main chain can be obtained easily by polycondensation of dihydroxy thiacrown ether with sticcinyl chloride in the presence of pyridine.

Key words: crown ether, polymeric crown ether, lariat thiacrown ether, polyester, esterifica- tion, polycondensation, synthesis