Die 'H-und 3C-Kernresonanz-Spektren eines [2]-Catenans (1) und seiner molekularen Untereinheiten (2, 3) wurden in CDCI3, C6Db und C6Dlz gemessen. Im 13C-NMR-Spektrum beobachtet man beim ubergang von den molekularen Untereinheiten zum Catenan Tieffeldverschiebungen von bis zu 1 ppm, die mit van der Waals-Wechselwirkungen zwischen den beiden Untereinheiten erklart werden konnen. Im 'H-NMR-Spektrum findet man sowohl Hochfeldals auch Tieffeldverschiebungen, die in erster Linie durch Losungsmitteleffekte hervorgerufen werden. Die Spektren der Cycloalkane von C6H12 bis C44H88 werden zum Vergleich in Abhangigkeit von der Ringgrok diskutiert. Comparative N. M. R. Studies on Macrocycles and on a CatenaneThe 'H and 13C n.m.r. spectra of a [2]-catenane (1) and its molecular subunits (2,3) were measured in CDCI,, Cb&, and C6D12. In the I3C n.m.r. spectrum low field shifts of up to 1 ppm are noted in going from the molecular subunits to the catenane. These can be explained by van der Waals interactions between the two subunits. In the 'H n.m.r. spectrum high field as well as low field shifts can be observed which are mainly caused by solvent effects. For comparison the spectra of the cycloalkanes from C6HI2 up to C44Hs8 are discussed as a function of ringsize.
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