149508-03-2Relevant academic research and scientific papers
Isolation of Novel Radical Cations from Hydroquinone Ethers. Conformational Transition of the Methoxy Group upon Electron Transfer
Rathore, Rajendra,Kochi, Jay K.
, p. 4399 - 4411 (2007/10/02)
Hydroquinone ethers as the bis-annulated derivatives R1-R3 are excellent electron donors by virtue of the facile oxidation to their radical cations R1.(1+), R2.(1+), and R3.(1+) that are readily isolable as unusually robus
Ditopic thiacyclophanes containing the S(CH2)2X(CH2)2S (X = O, S) linkage. Synthesis and structures of 2,5,8,17,20,23-hexathia(1,2)(4,5)cyclophane and 5,20-dioxa-2,8,17,23-tetrathia(1,3)(4,6)-2,5-bis(ethoxy)cyclophane
Loeb, Stephen J.,Shimizu, George K. H.
, p. 1728 - 1734 (2007/10/02)
The Cs+/DMF mediated reactions of 1,2,4,5-tetra(bromomethyl)benzene and 1,2,4,5-tetra(bromomethyl)-3,6-bis(ethoxy)benzene with dithiols HSCH2CH2XCH2CH2SH (X = S, O) were explored in order to ascertain the effect of structural variations on the regioselectivity of double ring-closure. Although a structure with bis(ortho) geometry was the target molecule, the major products are those with a bis(meta) structure. Two crystal structures, one with a bis(ortho) structure, 2,5,8,17,20,23-hexathia(1,2)(4,5)cyclophane, 1, and one with a bis(meta) structure, 5,20-dioxa-2,8,17,23-tetrathia(1,3)(4,6)-2,5-bis(ethoxy)cyclophane, 7, are reported. 1 crystallized in the triclinic space group P with a = 8.583(3), b = 11.806(3), c = 5.448(2) Angstroem, α = 97.18(2), β = 107.18(2), γ = 99.40(2) deg, V = 511.6(6) Angstroem3, and Z = 1. The structure refined to R = 6.48percent and Rw = 7.13percent for 1020 reflections with F02 > 3?(F02). 7 crystallized in the triclinic space group P with a = 9.568(2), b = 9.577(2), c = 8.312(2) Angstroem, α = 113.53(2), β = 94.58(2), γ = 114.94(2) deg, V = 604.3(7) Angstroem3, and Z = 1. The structure refined to R = 3.86percent and Rw = 4.20percent for 1129 reflections with F02 > 3?(F02). Both compounds sit on a crystallographic centre of symmetry and have the thioether linkages oriented on opposite sides of the central aromatic ring.
