ESR studies of the kinetics of intramolecular collisions between the two ends of hydrocarbon chains having the structure (α-naphthyl−)-(CH2) i-(α-naphthyl)

Intramolecular Electron Transfer between 2,5-Dimethoxy-1,4-phenylene Units in [n.n]Paracyclophane Radical Cations

“…The rate of the single bonds (corresponding to n ϭ 5) with intramolecular distances of 7.4 [9] and 9 Å [10] [11] , respectively. Furthermore, intramolecular electron transfer is mainly influenced by the length and the individual conformation of the alkano Szwarc et al [12] demonstrated a fast intramolecular electron exchange at higher temperatures for radical anions with two bridges and, furthermore, by the reorganization energy, composed of the conformational changes of the molecule 2-naphthyl units linked by Ϫ(CH 2 ) 3 Ϫ and Ϫ(CH 2 ) 4 Ϫ bridges, respectively. These results suggest that in [n.n]paraupon electron transfer, the rearrangement of the counterion, and the solvent reorganization.…”

“…of the non-deuterated compound NMR Gauss meter and a Hewlett-Packard 5342A microwave fre-181Ϫ182°C [22] [21] , pseudogeminal (5) [1b] , pseudogeminal (7) [3] and pseudoortho 6,9,16,19-tetra-C 8 D 8 ], 167 (13), 138 (35), 112 (13). methoxy [4.4]paracyclophane (12) [3] , pseudogeminal 7,10,18,21-tetramethoxy [5.5]paracyclophane (8) [4] , 9,12,22,paracyclophane: To a boiling, oxy [7.7]paracyclophane-4,17-dione (9) [16] , and 4,7-dimeth-stirred suspension of potassium carbonate (25 g) in ethanol/water oxy [2.2]paracyclophane (15) [22] were available in our laboratory or (95:5, 3 l) a solution containing 1,4-bis(2-bromoethyl)benzene (10.2 were prepared as described in the literature. …”