ISSUE 1

ISSUE 2

ISSUE 3

ISSUE 4

ISSUE 5

ISSUE 6

ISSUE 7

ISSUE 8

ISSUE 9

ISSUE 10

ISSUE 11

ISSUE 12

ISSUE 10

Year 2007, Month 10 (Section Full Articles, Page 2060)

Synthesis, structure, and electrochemical properties of 1²,4²-dioxo-2¹,3¹-diphenyl-7,10,13-trioxa-1,4(3,1)-diquinoxalina-2(2,3),3(3,2)-diindolizinacyclopentadecaphane

V. A. Mamedov, A. A. Kalinin, V. V. Yanilkin, N. V. Nastapova, V. I. Morozov, A. A. Balandina, A. T. Gubaidullin, O. G. Isaikina, A. V. Chernova, Sh. K. Latypov, and I. A. Litvinov

The oxidative dehydrocyclization of the 3-(indolizin-2´-yl)-2-oxoquinoxaline monopodand performed either electrochemically or under the action of molecular iodine affords new redox-active heterocyclophane consisting of the redox-switchable biindolizine fragment combined with the polyether-bridged π-deficient quinoxaline systems. The single-crystal X-ray diffraction study showed that the trioxaundecane chain of heterocyclophane adopts an extended conformation, and one of the phenyl substituents of the molecule closes the pseudocavity formed by the spacer from one of the sides. The cyclic voltammetric study of heterocyclophane in MeCN and DMF showed the three-step oxidation of the indolizine fragments accompanied by the single-electron transfer in each step. The first and third steps are reversible, and the second step is irreversible. The oxidation at potentials of the first peak gives rise to stable radical cations detected by the ESR method (g = 2.0024, a_2N = 0.26 mT).

BACK   I wish to order PDF file of this article for 25.00 USD