Detailed interpretations of the spectra of endo-(Ia) and exo-(Ib) cyclopentadiene dimer, endo-cyclopentadiene trimer (VII), and endo-cyclopentadiene tetramer (IX) are given. The doublet found at τ 9·25 in the spectrum of the endo-trimer is assigned to 10-Hy(VII), the doublet coupling being due to 10-Hx which is situated at τ 7·76. A similar AB system is found in the spectrum of the endo-tetramer.
R. G. Foster and M. C. McIvor, J. Chem. Soc. B, 1969, 188 DOI: 10.1039/J29690000188
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