The paramagnetic La@C82-A(C2v) with unsaturated thiacrown ethers forms 1 : 1 host–guest complexes of [La@C82-A(C2v)]−[D]+ in solution as a result of electron transfer.
An Economical Approach to the Synthesis of Unsaturated Thiacrown Ethers
作者:Jing-Kui Yang、Dong-Qing Sun
DOI:10.1055/s-0030-1260066
日期:2011.8
synthesize unsaturated thiacrown ethers through the reaction of 1,1-dichloroethylene with sodium sulfide in the presence of a 15-crown-5 catalyst. Besides the compounds containing cis-carbon-carbon double bonds, two unsaturated thiacrown ethers each containing one trans-carbon-carbon double bond were also isolated. unsaturated thiacrown ether - 1,1-dichloroethylene - economical approach - macrocyclic compounds
The methylation reactions of unsaturated thiacrown ether with methyl triflate proceeded to give mono- and dimethylated unsaturated thiacrown ether. The stereochemistry of the obtained products were determined by single-crystal X-ray diffraction analysis. The positive charges of the products were found to distribute throughout the entire unsaturated thiacrown ether moieties by calculation of electrostatic
wavelengths by changing the solvent from acetonitrile to cyclohexane. The cyclic voltammograms of 4-8 indicate that the larger unsaturated thiacrown ethers were oxidized more easily than the smaller systems, and unsaturated thiacrown ethers were oxidized more easily than corresponding saturated systems. The reaction of 4 with silver trifluoroacetate in acetone afforded the colorless complex Ag(I)(C2H2S)5(CF3COO)
ethers with 15, 18, and 21 members were oxidized to sulfoxides by the reaction with m-CPBA. The reaction with t-BuOCl at −20 °C also afforded sulfoxides, whereas the reaction at room temperature yielded cis−trans isomerized compounds. The cis−trans isomerized compound was also obtained by the photochemicalreaction or by the reaction with NCS and NCP. Meanwhile, the reaction with NBS and NBP provided