Production of Macrocyclic Polyether Benzo-15-Crown-5 and its Functional Derivatives

Abstract

Study of interaction between catechol and tetraethylene glycol dichloride in the n-butanol media, resulting with benzo-15-crown-5 production. Production of nitro-and amino-derivatives of benzo-15-crown-5. Determination of their thermogravimetric characteristics.

Crown Ether Nanovesicles (Crownsomes) Repositioned Phenytoin for Healing of Corneal Ulcers

“…On the other hand, the thermal behavior of 18-crown-6 is not clearly understood with few data available in the literature. The thermogram of 18-crown-6 (Figure e) suggested that the thermal decomposition process of crown ethers is a complicated process, as reported by Glushko et al . The process may occur in two stages: melting endotherm and decomposition exotherm.…”

“…42 On the other hand, the thermal behavior of 18-crown-6 is not clearly understood with few data available in the literature. The thermogram of 18crown-6 (Figure 7e) suggested that the thermal decomposition process of crown ethers is a complicated process, as reported by Glushko et al 43 The process may occur in two stages: melting endotherm and decomposition exotherm. The endothermic peak of 18-crown-6 melting point cannot be detected in the thermogram as 18-crown-6 melts at low temperature (around 42 °C); 44 however, a sharp exothermic peak, which may correspond to the ignition of 18-crown-6 during its decomposition, is detectable near 275 °C, as reported about other crown ethers in the literature.…”

“…The process may occur in two stages: melting endotherm and decomposition exotherm. The endothermic peak of 18-crown-6 melting point cannot be detected in the thermogram as 18-crown-6 melts at low temperature (around 42 °C); however, a sharp exothermic peak, which may correspond to the ignition of 18-crown-6 during its decomposition, is detectable near 275 °C, as reported about other crown ethers in the literature …”

“…The endothermic peak of 18-crown-6 melting point cannot be detected in the thermogram as 18-crown-6 melts at low temperature (around 42 °C); 44 however, a sharp exothermic peak, which may correspond to the ignition of 18-crown-6 during its decomposition, is detectable near 275 °C, as reported about other crown ethers in the literature. 43 TEM. Figure 8 depicts the morphologic characteristics of the optimized dispersion, suggesting the formation of almost spherical nanovesicles.…”

The Sorption Capacity of Polymer Sorbents on the Basis of Polyimides with Crown Ethers

“…Pyromellitic anhydride (PMDA), dianhydride 3,3', 4,4' -benzophenontetracarboxylic acid (BPDA), dianhydride 3,3', 4,4' -diphenylacetylene acid (FTFA) dianhydride 1,4-bis(3',4'dicarboxyphenoxy)-benzene (GHDFA) and diamino-dibenzocrown-esters were obtained by us earlier 17,18 . Mass fraction of basic substance was more than 97%.…”