140834-24-8Relevant articles and documents
Tweezer-Shaped Hydrocarbons
Voegtle, Fritz,Koch, Herbert,Rissanen, Kari
, p. 2129 - 2136 (2007/10/02)
1,8-Bis- and anthracenes of type I (e.g. 9, 6a) and 1,8-bisethynyl>- and -ethynyl>anthracenes of type II (e.g. 16, 13) were synthesized for the first time.Their hydrocarbon framework is formed by Grignard coupling and by Hagihara coupling, respectively.An X-ray analysis of 13 exhibits an approximate planar skeleton, only one aromatic ring showing a considerable deviation from that plane (Figure 2).The UV and fluorescence properties are discussed.In spite of their preorganized and rather rigid tweezer-shape the new hydrocarbons do not seem to use their multiple bonds for the cooperative binding of transition metal cations. Key Words: Hagihara coupling / Alkynes / Anthracenes / Molecular tweezers / Nanoscale molecules