The complexation of the diquat dication by dibenzo-3n-crown-n ethers

Effect of crown ether ring size on binding and fluorescence response to saxitoxin in anthracylmethyl monoazacrown ether chemosensors

“…To a solution of triethylene glycol bistosylate (synthesized according to literature procedure 13 with some modifications) (5.02 g, 10.93 mmol) in anhydrous THF (100 mL) was added 2-(2-(benzyloxy)ethoxy)ethanol (4.50 g, 22.96 mmol) and NaH (2.20 g, 54.68 mmol, 60% dispersion in mineral oil, the oil was removed from the product chromatographically). The mixture was heated at 65 °C for 1.5 h. After cooling to RT, NH 4 Cl (sat.…”

11,28-Bis(chloroacetyl)-6,7,9,10,12,13,15,16,23,24,26,27,29,30,32,33-hexadecahydrodibenzo[b,q][1,4,7,10,16,19,22,25,13,28]octaoxadiazacyclotriacontine

“…2a). Furthermore, there is an absence of coplanarity (Makriyannis & Fesik, 1982;Kruse & Cha, 1982;Mersh, Saunders & Matlin, 1983;Colquhoun et al, 1985;Allwood, Shahriari-Zavareh, Stoddart & Williams, 1987;Allwood et al, 1987a) of both the ortho-related oxymethylene units with their associated benzo rings. In one instance, the O(1)---C(2) bond is rotated 69 ° out of plane whereas, in the other instance, the C(12)---O(13) bond is rotated 30 ° out of plane.…”

“…Dibenzo-30-crown-10 (1) has been shown (Colquhoun, Goodings, Maud, Stoddart, Wolstenholme & Williams, 1985;Stoddart, 1988) to form 1:1 complexes in both the solution and solid states with the bipyridinium dication, Diquat. On the other hand, the chemically related dication, Paraquat, is bound only very weakly by (1).…”

Pd-Сatalyzed Amination for the Synthesis of Macropolycycles Comprising Cyclen, Cyclam and Naphthalene Moieties

“…Macrocycles containing 2,3-disubstituted naphthalene fragment have been investigated for alkali metals, ammonium and alkylammonium salts coordination, [2][3][4][5][6][7] as well as macrocycles possessing two naphthalene and two polyoxa fragments. [8,9] Macrocycles with polyoxa chains were obtained on the basis of 1,5-1,7-and 1,8-disubstituted naphthalene and their complexing properties towards alkali metals were studied. [5][6][7][8][9][10] Several works deal with polyoxamacrocycles organized around 2,2'-and 3,3'-disubstituted 1,1'-binaphthalenes, [6,7] among these compounds there are sophisticated macrotricyclic cryptands bearing two 1,10-diaza-18-crown-6 fragments.…”

“…[8,9] Macrocycles with polyoxa chains were obtained on the basis of 1,5-1,7-and 1,8-disubstituted naphthalene and their complexing properties towards alkali metals were studied. [5][6][7][8][9][10] Several works deal with polyoxamacrocycles organized around 2,2'-and 3,3'-disubstituted 1,1'-binaphthalenes, [6,7] among these compounds there are sophisticated macrotricyclic cryptands bearing two 1,10-diaza-18-crown-6 fragments. [11] Spherands with 2,2'-dioxy-1,1'-binaphthalenes and 2,7-disubstituted 1,8-dihydroxynaphtahlene moieties constitute another class of macrocycles, [10,12] the latter compound was tested in the coordination studies with Mg(II), Fe(II), Co(II), Ni(II) and Zn(II) cations.…”