New Macrocycle Synthesis, Part VIII [1]. The Synthesis of Dibenzo(3 k +2(crown- k And Cationic Recognition With Fluorescence Spectroscopy

Eu(fod)3 binding on the 1H‐NMR spectra of bis(2′‐ethylbenzoate)ethylene glycol podands

“…Although several analytical tools and methods have been used to display the cationic binding role of macrocyclic ethers, different methods have given different results . We have been working on the synthesis of various types of macrocyclic ethers and on their cation complex formation using different analytical methods such as potentiometry, fluorescence, and NMR spectroscopy . We have recently prepared some bis (2′‐ethylbenzoate)ethylene glycol podands which have one, two, three, or four ethyleneoxy groups to study their cationic recognition with NMR spectroscopy.…”

The synthesis of chromophore ended glycoles, part IV. Bis-coumarin derivatives ended polyglycols

“…The synthesis and ion binding roles of crown ethers bearing coumarin in general [14,18] have also been reported. However, bis-(3-hydroxyphenoxy) ended mono-and diglycols (1a,1b) synthesized previously [12] were also converted to new bis-coumarin ended polyglycols using common methods of coumarin formation in this work [9,10,14,18]. The results of both methods of coumarin derivatives are reported in Scheme 1.…”

“…Bis-(3-hydroxyphenoxy) ended glycols, 1a and 1b, were prepared according to ref. [12]. Table 1 The quantum yields, (1-I l /I q ) of some products in conc.…”

“…The crude product was dissolved in CHCl 3 (20 mL) and chromatographed on alumina (basic) with CHCl 3 (4x25 mL) to give the compounds, 3e-3h. The mp, yields, IR spectra and 1 H nmr spectra of compounds, 3e-3h, are displayed in Table 3 [8,11,12].…”

The synthesis of novel crown ethers, part X, 4‐propyl‐and 3‐ethyl‐4‐methylchromenone‐crown ethers

“…The macrocyclic ether derivatives of the 3-phenyl, 4-H, 4-methyl-6,7-dihydroxy-as well as -7,8-dihydroxycoumarins synthesised recently showed selective cation binding effects with steady state fluorescence emission spectroscopy. The reports on macrocycles containing common aromatic groups have shown the essential cation selectivity role using fluorescence spectroscopy [14][15][16]. Detailed literature and explanation of optical aspects have been given in our earlier paper [13].…”