syn,syn‐1,6:8,17:10,15‐Trismethano[18]annulene

Abstract

syn,syn-1,6 : 8,17: 10,15-Trisrnethanorl8lannulene and in solution, was confirmed by X-ray structure analysis [5] --

Fluorescence excitation and UV–UV double-resonance spectroscopy of the S0 → S1(Lb) transition of 1,6-methano[10]annulene cooled in a supersonic jetDedicated to Professor F. Dörr on the occasion of his 80th birthday.

“…11 Subsequently other [10]-, [14]-, [18]-, and [22]-annulenes were synthesized which are in a similar fashion related to azulene, anthracene, phenanthrene, tetracene, and pentacene. [12][13][14][15][16] The first aromatic C n H n -annulene without bridges was [18]annulene synthesized by the group of Sondheimer. 17 This compound can assume a planar conformation of D 6h symmetry which is free of strain.…”