Heinz A. Staab. Electron Donor-Acceptor Compounds, 45 Syntheses of [2.2]-, [3.3]-, and [4.4]Paracyclophanes with 1,2,4,5-Tetracyanobenzene Units as Electron Acceptors // Chemische Berichte
Volume 120 Issue 4, Pages 541 - 549
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http://dx.doi.org/10.1002/cber.19871200414