The first observation in an organic medium and DFT calculation of the TMM radical anion generated via a single electron reduction of a methylenecyclopropane
作者:Hiroshi Ikeda、Hayato Namai、Nobuyuki Kato、Teruyo Ikeda
DOI:10.1016/j.tetlet.2006.01.024
日期:2006.3
gamma-Irradiation of 2,2-diphenyl-1-methylenecyclopropane (3) in a degassed 2-methyltetrahydrofuran glassy matrix at 77 K gave an intense UV/vis absorption band with lambda(ab) at 496 nm. This result and calculations based on density functional theory for its radical anion 3- and the corresponding trimethylenemethane radical anion (2(.-)) strongly suggest that single electron reduction of 3 followed by ready ring opening affords 2(.-), whose molecular geometry is largely twisted (theta = 45.5 degrees), and the negative charge and spin are localized mainly in the diphenyl methyl and allyl moieties, respectively. (c) 2006 Elsevier Ltd. All rights reserved.