121031-83-2Relevant academic research and scientific papers
MACROHETEROCYCLES XLVIII. SYNTHESIS OF POLYAZAOXACRYPTANDS IN A TWO-PHASE SYSTEM
Luk'yanenko, N. G.,Basok, S. S.,Filonova, L. K.,Kulikov, N. V.
, p. 1537 - 1544 (2007/10/02)
A method is proposed for the production of polyazaoxacryptands by the condensation of N,N'-bis(tosylaminoethyl)diazacrown ethers with ditosyloxy derivatives or dibromides in the toluene-45percent aqueous sodium hydroxide two-phase system.The catalytic act
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.
