20768-77-8Relevant academic research and scientific papers
Synthesis of podands bearing aromatic end groups and complex formation with tropylium tetrafluoroborate in 1,2-dichloroethane
Laemsae, Markku,Raitamaa, Kirsi,Pursiainen, Jouni
, p. 557 - 563 (2007/10/03)
A series of podands bearing phenyl, naphthyl and anthryl end groups were prepared and characterized. UV-visible spectrophotometry was used to investigate the host-guest chemistry of the podands in complexation with tropylium tetrafluoroborate in 1,2-dichloroethane. The results, are discussed and compared with those for previously studied systems containing crown ethers. The stability constants for these open-chain polyethers are in the range 5,1-8,4 dm3 mol-1, except for the podand having anthryl end groups [1,12 bis(anthryl-9)-2,5,8,11-tetraoxadodecane], which gives a 10-fold increase in the stability constant. Copyright
1H NMR Studies on the Interactions of Acyclic Polyethers with Dimethyltin Dichloride in Aromatic Solvents
Otera, Junzo,Shiomi, Tadashi,Murakami, Kazuhiko,Kawasaki, Yoshikane
, p. 2964 - 2967 (2007/10/02)
The interactions between various acyclic polyethers, RO(CH2CH2O)nR'(R, R'=CH3, Ph), and dimethyltin dichloride (DMTC) in aromatic solvents have been studied by means of 1H NMR spectroscopy.On the basis of a continuous variation method, the formation of the 1:1 complexes between glymes, CH3O(CH2CH2O)nCH3 (n=2, 3, 4), and DMTC was revealed in benzene.The 2J(119Sn-CH3) values suggested distorted trans-octahedral configurations for these complexes.From the statistical consideration of stability constants, it was found that the coordination occurred virtually through neighboring two oxygen atoms in these complexes.DMTC gave the complexes of both 1:1 and 1:2 glyme/DMTC stoichiometry with glymes (n=5, 6) in benzene and with all glymes employed here in toluene and 1-chloronaphthalene.Coexistence of 1:1 and 1:2 species was also encountered for PhO(CH2CH2O)nCH3 (n=3, 4, 5), whereas no appreciable interaction was observed between PhO(CH2CH2O)nPh (n=2, 3, 4) and DMTC.On the basis of these observations, the additional formation of the 1:2 complexes was assumed to be caused by the bulkiness of polyethers.
