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- W2019183791 abstract "A phenolic cycloheptamer (11) and an analogous chain oligomer (10) with nearly the same structure were gained by stepwise syntheses. The cycloheptamer has a higher melting point and a better solubility in chloroform. In contrast to the chain oligomer his infrared spectrum indicates a stronger association of the hydroxyl groups which is not influenced by the solvent. The mass spectra announce a preferred statistical cleavage along the chain of compound 10 and a great stability of the ring of 11 which preferentially loses his substituents. The 1H NMR spectra confirm the constitutions of the chain (10) and ring compound (11). The cycloheptamer is distinguished by a ring inversion or a pseudorotation, seen by the NMR signals of the methylene protons. The activation energy of the pseudorotation is determined." @default.
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- W2019183791 date "1980-10-01" @default.
- W2019183791 modified "2023-10-03" @default.
- W2019183791 title "Stufenweise darstellung eines cycloheptamers aus p-kresol, 4-tert-butylphenol und formaldehyd. Vergleich mit einem phenolischen, heptanuklearen kettenoligomer" @default.
- W2019183791 doi "https://doi.org/10.1002/macp.1980.021811003" @default.
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