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Spectroscopic studies and PM5 semiempirical calculations of new Schiff bases of gossypol with polyoxaalkylamines.

Three Schiff bases of racemic gossypol with polyoxaalkylamines were synthesized and studied by FTIR and (1)H-NMR spectroscopy, and their structures were calculated by the PM5 semiempirical method. These Schiff bases exist in the solid state and in solutions as enamine forms. An increasing length of the polyoxaalkyl chain causes the increase of the interaction of the oxygen atoms of this chain with the OH groups in the 6,6' positions. This interaction is very well evidenced in the FTIR and (1)H-NMR spectra. The structures of the Schiff bases and the hydrogen bonds within these structures are discussed.[1]

References

  1. Spectroscopic studies and PM5 semiempirical calculations of new Schiff bases of gossypol with polyoxaalkylamines. Przybylski, P., Bartl, F., Brzezinski, B. Biopolymers (2002) [Pubmed]
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