IT is an interesting fact that neitherjpentalene (1), nor heptalene (2), nor any derivatives of them have been definitely reported as being synthesized 1 or found to occur naturally. Azulene (3 ...

Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Xiyuan Avenue 2006, Chengdu 611731, China ...

Institute of Physics, Ecole Polytechnique Fédérale de Lausanne (EPFL), Station 3, Lausanne CH-1015, Switzerland ...