New chiral tin compounds containing the 2-(4-isopropyl-2-oxazolinyl)-5-phenyl ligand |
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Authors: | Krzysztof Staliński Zofia Urbańczyk-Lipkowska Leszek Rupnicki |
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Institution: | a Institute of Organic Chemistry, Polish Academy of Sciences, Kasprzaka 44/52, 01-224 Warsaw, Poland b Pharmaceutical Research Institute, Rydygiera 8, 01-793 Warsaw, Poland c Department of Chemistry, Warsaw University, Pasteura 1, 02-093 Warsaw, Poland d Nesmeyanow Institute of Organo-Element Compounds, Russian Academy of Sciences, Vavilow 28, 117813 Moscow, Russia |
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Abstract: | A series of tri- and tetraorganotin compounds containing the optically active 2-(4-isopropyl-2-oxazolinyl)-5-phenyl ligand and tert-butyl, methyl and/or phenyl groups on the tin has been synthesized. All the novel compounds have been characterized, especially by means of the multinuclear NMR investigation, the results of which are discussed. The tin halides, as pairs of diastereoisomers in solution, crystallize in the form of one diastereoisomer. The single-crystal X-ray analysis of tin iodide 10a revealed pseudo-equatorial position of the tert-butyl group opposite to the isopropyl group. In the corresponding diastereomeric tin hydrides values of 1J(1H-117/119Sn) differ significantly, suggesting a different pseudo-axial/equatorial position of the hydrogen atom. |
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Keywords: | NMR spectroscopy Sn-N coordination Tin halides Tin hydrides |
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