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Article citations


Irie, R., Tanoue, A., Urakawa, S., Imahori, T., Igawa, K., Matsumoto, T., Tomooka, K., Kikuta, S., Uchida, T. and Katsuki, T. (2011) Synthesis and Stereochemical Behavior of a New Chiral Oxa[7]heterohelicene. Chemistry Letters, 40, 1343-1345.

has been cited by the following article:

  • TITLE: Syntheses, Characterization and DFT Analysis of Two Novel Thiaheterohelicene Derivatives

    AUTHORS: Tetsuji Moriguchi, Keiichi Mitsumoto, Yuki Nishizawa, Daisuke Yakeya, Venkataprasad Jalli, Akihiko Tsuge

    KEYWORDS: Crystal Structure, Thiaheterohelicene Derivative, Strained Structure, Single Crystal X-Ray Study

    JOURNAL NAME: Crystal Structure Theory and Applications, Vol.5 No.4, November 16, 2016

    ABSTRACT: Two novel thiaheterohelicene derivatives were synthesized from the corresponding 2,2'-(2,6-naphthalenediyl-di-2,1-ethenediyl) bis-thiophene and its dimethyl substituted analogue 2,2'-(2,6-naphthalenediyldi-2,1-ethenediyl) bis-2’’-methylthiophene using oxidative photo cyclization reaction. The compounds were characterized by 1H NMR, electron impact-mass spectrometry, elemental analyses, and the absolute molecular structures were determined by single crystal X-ray diffraction analysis. They crystallized under monoclinic system with space group P21/n for the unsubstituted compound and P21/c for the methyl substituted compound, respectively. The dihedral angle between the terminal thiophene ring and the molecular center was observed to be 20.82? for the unsubstituted compound and 14.27? for the methyl substituted compound, respectively. Furthermore, molecules oriented as herringbone structures by intermolecular π-π stacking in the crystals. The relative study of the actual arrangement of these molecules has been carried out using X-ray diffraction analysis. The two molecules have different crystal packing. The molecule 3b has herring bone like arrangement due to the substituent bulkiness and weak CH-π interaction. On the other hand, the molecular packing of molecule 3a is not herringbone probably due to the multiple weak intermolecular CH-S short contacts between columns consisting of stacked molecules.