31249-95-3Relevant articles and documents
An Improved One-Step Method to Prepare Diaza-crown Ethers and the Cation Complexation Properties of 4,10-Diaza-18-Crown-6 with Two Transition Metal Ions
Krakowiak, Krzysztof E.,Maas, Garren E.,Bradshaw, Jerald S.,Hathaway, Jon K.,Izatt, Reed M.
, p. 179 - 182 (2007/10/02)
4,10-Diaza-15-crown-5, 4,10-diaza-18-crown-6, 4,13-diaza-21-crown-7, and 4,16-diaza-24-crown-8 were prepared by an improved method from the appropriate oligothylene glycol diiodides and diamines.The thermodynamic values of log K, ΔH and ΔS for the interaction of 4,10-diaza-18-crown-6 with Pb2+ and Ag+ were determined by a calorimetric titration method and compared with thermodynamic values for interactions of 4,13-diaza-18-crown-6 with the same cations.The thermodynamic values were found to be different for the two diaza-crown ligands. 4,10-Diaza-18-crown-6 and its 4,13-diaza-crown analog formed precipitates when treated with Co2+, Cd2+, Cu2+, and Ni2+ so that no thermodynamic data are reported for these interactions.
KINETIC AND EQUILIBRIUM STUDIES OF THE REACTION OF 1,3,5-TRINITROBENZENE WITH CRYPTANDS IN ACETONITRILE
Leska, Boguslawa,Hes, Marzanna,Schroeder, G.
, p. 671 - 680 (2007/10/02)
Kinetic and equilibrium data for the formation of the adduct from 1,3,5-trinitrobenzene (TNB) with cryptands (221, 222, 21, 22 and di-(Ph-CH2)22) in acetonitrile are reported.The influence of structure and pKa of cryptands on the rate constants, activation and reaction parameters are discussed.A reaction mechanism between TNB and different cryptands has been proposed.
MACROHETEROCYCLES. PART 44. FACILE SYNTHESIS OF AZACROWN ETHERS AND CRYPTANDS IN A TWO-PHASE SYSTEM
Lukyanenko, Nikolai G.,Basok, Stepan S.,Filonova, Lyubov K.
, p. 3141 - 3148 (2007/10/02)
A facile procedure is proposed for the preparation of azacrown ethers and cryptands by condensation of dibromides or ethylene glycol bis(toluene-p-sulphonate)s with acyclic bis(sulphonamide)s or with bisdiazacrown ethers, respectively.The reaction was carried out in a two-phase system of aqueous alkali-toluene (benzene)in the presence of quaternary ammonium salts as phase transfer catalysts.The catalytic activity decreased in the sequence: Bu4NI ca.Bu4NBr > Bu4NCl > Bu4NHSO4 > Et3NCH2C6H5NCl.Maximum yields of twelve-membered azacrown ethers are obtained when lithium hydroxide is used, while crown ethers of larger size are observed in the presence of sodium or potassium hydroxides; this may be due to a template effect.