The inexpensive starting material, 1,1-dichloroethylene, was
used as a substitute for 1,2-dichloroethylene to 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 - hydrogen
anion transfer