Monoaza[5]helicenes. Part 2: Synthesis, characterisation and theoretical calculations
摘要:
The synthesis of four different monoaza[5]helicenes is reported, to complete the whole series of these compounds, so that systematic studies on their properties can be carried out. They were fully characterised via NMR. A theoretical approach to explain why ring closure occurs to give the most crowded compound is reported, in comparison with earlier calculation methods. (c) 2005 Elsevier Ltd. All rights reserved.
Monoaza[5]helicenes. Part 2: Synthesis, characterisation and theoretical calculations
摘要:
The synthesis of four different monoaza[5]helicenes is reported, to complete the whole series of these compounds, so that systematic studies on their properties can be carried out. They were fully characterised via NMR. A theoretical approach to explain why ring closure occurs to give the most crowded compound is reported, in comparison with earlier calculation methods. (c) 2005 Elsevier Ltd. All rights reserved.
carbo[5]helicenes and monoaza[5]helicenes emphasizes the importance of the “shape factor” (responsible of the isomorphism between some species in the series) as well as the lack of a unique supramolecular effect organizing the molecules in the crystals (responsible for the polymorphism observed for some compounds).
The synthesis of four different monoaza[5]helicenes is reported, to complete the whole series of these compounds, so that systematic studies on their properties can be carried out. They were fully characterised via NMR. A theoretical approach to explain why ring closure occurs to give the most crowded compound is reported, in comparison with earlier calculation methods. (c) 2005 Elsevier Ltd. All rights reserved.