2,13-Diaza[5]helicene: Synthesis, theoretical calculations and spectroscopic properties

Arkivoc

Volumn 2009, Issue 8, 2009, Pages 145-155

  Caronna, Tullio ^a   Fontana, Francesca ^a   Longhi, Giovanna ^b   Mele, Andrea ^c,d   Sora, Isabella Natali ^a   Viganò, Luca ^a  

^a UNIVERSITY OF BERGAMO   (Italy)

^b UNIVERSITY OF BRESCIA   (Italy)

^c POLITECNICO DI MILANO   (Italy)

^d CNR   (Italy)

Author keywords

2,13 Diaza 5 helicene; 2,9 diaza dibenzo a.h anthracene; NMR; Photochemical ring closure; Solvent polarity; Theoretical calculations

Indexed keywords

EID: 68349105866     PISSN: 1551-7012     EISSN: 15517012     Source Type: Journal    
DOI: 10.3998/ark.5550190.0010.812     Document Type: Article

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18. Compound 5 was already reported in ref 4. Despite the fact that the NMR spectra show the same number of signals and the same multiplicity and they appear quite clean, the chemical shifts are different. Moreover there is a strong difference in the melting points. Due to the small amount of material obtained at that time, it was not possible to make a comparison between the former product and the one obtained now. We have no explanation for this difference.