1. a Centre for Organic Chemistry Costin D. Nenitescu, Romanian Academy, 202B Spl. Independentei, CP 35-108, Bucharest 060023, Romania
2. b Centre for Organic Chemistry Costin D. Nenitescu, Romanian Academy, 202B Spl. Independentei, CP 35-108, Bucharest 060023, Romania
3. c Centre for Organic Chemistry Costin D. Nenitescu, Romanian Academy, 202B Spl. Independentei, CP 35-108, Bucharest 060023, Romania
4. d Centre for Organic Chemistry Costin D. Nenitescu, Romanian Academy, 202B Spl. Independentei, CP 35-108, Bucharest 060023, Romania
5. e Department of Polymer Science, University "POLITEHNICA" of Bucharest, 149 Calea Victoriei, Bucharest 010072, Romania