By bridging 1,3:4,6-bis(3,6-dihydroxy-1,2-xylylene)tetrahydro-3a,6a-diphenyl imidazo[4,5]-imidazole-2,5(1H,3H)-dione 1 w......

5,11,17,23-Tetrakis-1 ， 1-dimethylethyl-25,27-dihydroxy-26,28-1 ， 7 ， 13-trioxa-4 ， 10-dithiatridecylcene-calix [ 4 ] arene ......

<正> 聚硅氧烷与冠醚均具有各自的独特性能,二者结合起来,有可能成为一类新型材料。Cram等首先进行了这方面的探索,他们将手征性双......

Four new polymeric oxa-thiacrown ethers were prepared by the intramolecular cy-clization of poly (2-chloroethylglycidyl ......

A new type of crown functionalized polysiloxane, in which the crown moieties were incorporated into main chain, and its ......

The present paper represents the syntheses of polypropyloxymethyldithia 15-crown-5 and 18-crown-6 supported on silica an......