A study of the stereochemistry and electronic transitions of cyclic and acyclic thioamides by crystallography, spectroscopy and computational methods
Research output: Thesis › Doctoral Thesis (compilation)
Analysis of conformations and electron transitions of 3-(alkyl or aralkyl)-5-(methyl or phenyl)rhodanines with analogues and N,N'-bis[(S)-1-phenylethyl]-thiourea have been performed by X-ray crystallography, 1H NMR, molecular mechanics, ultraviolet spectroscopy and for the chiral rhodanines, enantiomer chromatography and circular dichroism spectroscopy. The magnitude of rotational barriers has been determined. Attractive steric effect is determined in the syn form of 3-neopentyl-5-phenylrhodanine. Absolute configurations are determined for the anti and syn forms of 3-(S)-(1-phenylethyl)-5-methylrhodanine. A special study is made with the N-[(S)-(1-phenylethyl)]-dithiocarbamate anion and the equilibrium of its ammonium salt.
|Research areas and keywords||
Subject classification (UKÄ) – MANDATORY
|Award date||1998 May 29|
|State||Published - 1998|
Defence details Date: 1998-05-29 Time: 13:15 Place: Room F External reviewer(s) Name: Mannschreck, Albrecht Title: Professor Affiliation: Universität Regensburg, Institut für Organische Chemie, D-93040 Regensburg, Deutschland --- Article: K. Rang, J. Sandström, L.Thell and Q. Yang, Crystal and Molecular structure of 3-isopropyl-5-phenylrhodanine, Acta Chemica Scandinavica B 39 (1985) 123. Article: I. Pettersson, K. Rang and J. Sandström., Conformational studies of 3-alkylrhodanines and an analogous mesoionic compound., Acta chemica Scandinavica B 40 (1986) 751. Article: K. Rang, F.-L. Liao, J. Sandström and S.-L. Wang., Conformations and conformational changes of 3-isobutyl- and 3-neopentylrhodanines. A case of steric attraction studied by X-ray crystallography, NOE effects and force-field calculations, J. Chem. Soc. Perkin Trans. 2 (1995) 1521. Article: K. Rang, R. Isaksson and J. Sandström, Chromatographic enantiomerseparation and circular dichroism spectra of chiral rhodanines, J. Chem. Soc. Perkin Trans. 2 (1996) 1493. Article: K. Rang, F.-L. Liao, J. Sandström and S.- L. Wang, Diastereomers of 3-(S)-(1-phenylethyl)-5-methyl and -5-phenylrhodanine: crystal structures, conformations and circular dichroism spectra, Chirality 9 (1997) 568. Article: K. Rang, J. Sandström and C. Svensson, The conformational equilibrium of N,N'-bis[(S)-1-phenylethyl]-thiourea and its solvent dependence, studied by NMR and CD spectra and by X-ray crystallography, Accepted for publication by Canadian Journal of Chemistry. Article: K. Rang and J. Sandström, The N-(1-phenylethyl)-dithiocarbamate anion, electronic transitions, ultraviolet and CD spectra and reversible formation of its ammonium salts, Manuscript. The information about affiliations in this record was updated in December 2015. The record was previously connected to the following departments: Organic chemistry (S/LTH) (011001240)