1. Department of Chemistry; Visva-Bharati (A Central University), Santiniketan; 731235 India.
2. Department of Organic and Biomolecular Chemistry; Chemical Engineering Institute; Ural Federal University; 19 Mira Street 620002 Yekaterinburg Russian Federation.
3. I. Ya. Postovskiy Institute of Organic Synthesis; Ural Division of the Russian Academy of Sciences; 22 S. Kovalevskoy Street 620219 Yekaterinburg Russian Federation.