96859-75-5Relevant academic research and scientific papers
On the solid state inclusion of tetrabutylammonium cation in the imidazolium/trifluoromethanesulfonate H-bonds network observed in ionic co-crystals
Leclercq, Lo?c,Suisse, Isabelle,Nowogrocki, Guy,Agbossou-Niedercorn, Francine
, p. 433 - 437 (2008)
Three co-crystals of tetrabutylammonium and 1-alkyl-3-methylimidazolium bistrifluoromethanesulfonate, where alkyl are: ethyl (co-crystal I), butyl (co-crystal II) or (±)-2-methylbutyl (co-crystal III) have been crystallized by slow evaporation of a chloroform solution. The X-rays diffraction studies on single co-crystals revealed that the three crystalline materials obtained are respectively triclinic (P over(1, ?)) for I, monoclinic (P21/c) for II and triclinic (P over(1, ?)) for III . In each structure, the tetrabutylammonium cations are included in the H-bonds network that link all the imidazolium cations and trifluoromethanesulfonate anions. The H-bonds occur between the acidic protons of the imidazolium ring and the oxygen atoms of the counter ion. No supramolecular interaction (except obviously electrostatic) is observed between the tetrabutylammonium cations and the trifluoromethanesulfonate anions.
Spiroleptosphol isolated from Leptosphaeria doliolum
Hashimoto, Masaru,Tsushima, Taro,Murakami, Takanori,Nomiya, Masahiro,Takada, Noboru,Tanaka, Kazuaki
scheme or table, p. 4228 - 4231 (2009/04/06)
A novel γ-methylidene-spirobutanolide spirolephtoshol (1) was isolated from ascomycetous fungus Leptosphaeria doliolum as a cytotoxic compound. The relative structure was established by the NMR analysis involving the NOE experiments. Absolute structure of the bicyclic moiety was determined by chemical derivation followed by the CD analysis. The relative and absolute stereochemistry of the side chain was established by comparison of the 1H NMR spectra and the chiral GC chromatograms of the degradation product with the synthetic samples.
