7249-78-7Relevant academic research and scientific papers
Diaryl-substituted polyethers with acetoacet-anilide fragment in the synthesis of dihydro-pyrimidine-containing podands
Radionova,Titova, Yu. A.,Isenov,Fedorova,Rusinov,Charushin
, p. 998 - 1004 (2015/02/05)
The interaction of ortho-aminoaryl polyethers, derivatives of mono-, di-, and triethylene glycol, with acetyl ketene, generated from 2,2,6-trimethyl-4H-1,3-dioxin-4-one produced acetoacetanilide- containing podands. 2,2,6-Trimethyl-4H-1,3-dioxin-4-one reacted with aminoaryl-substituted podands containing a short polyether chain (1-2 atoms) in toluene medium without catalyst. Acetoacetanilide- containing podands with longer polyether chains could be obtained by using triethylamine or acetic acid as catalyst. Acetoacetanilide-containing podands were used in the Biginelli reaction as CH-active components.
Fluorescent ion indicators for cadmium and lanthanide ion detection
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, (2014/01/07)
The present invention provides a metal chelator and methods that facilitate binding, detecting, monitoring and quantitating of heavy metal ions in a sample. This metal chelating moiety has the following formula
Synthesis and spectroscopic properties of new bis-tetrazoles
Pazik, Agnieszka,Skwierawska, Anna
, p. 83 - 94 (2014/01/06)
Syntheses of N,N′-phenyltetrazole podands link with aliphatic chains containing oxygen, nitrogen and sulphur atoms, are described. The complexing properties of these compounds towards metal cations (Fe2+, Cu 2+, Zn2+, Co2+, Ni2+) were investigated by absorption and infrared spectroscopy. The UV-Vis titrations were performed to estimate the stability constant values of the respective complexes with Cu2+ ion. Changes in UV-Vis absorption spectra and IR spectra of compound 6 under various concentrations of Cu2+ ion in methanol suggest formation of very unstable complex. The structure of ligand 2 has been deduced by X-ray crystallography. The Author(s) 2012.
CYCLIC CARBODIIMIDE COMPOUND
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Paragraph 0273, (2013/04/10)
Disclosed is a cyclic carbodiimide compound useful as an end-capping agent for polymer compounds. The cyclic carbodiimide compound is represented by the following formula (i): wherein X is a specific divalent group or tetravalent group, q is 0 when X is a
Synthesis, characterization, tautomerism and theoretical study of some new Schiff base derivatives
Türkolu, Gülen,Berber, Halil,Dal, Hakan,?retir, Cemil
scheme or table, p. 1573 - 1583 (2011/10/03)
New Schiff base derivatives were prepared by the condensation of 5-chloro and 5-bromo salicylaldehyde with bis(o-aminophenol)ethers. Five bis(o-nitrophenol)ether compounds were synthesized using some ditosylate, 1,3-dibromopropane and 1,4-dibromobuthane w
Synthesis, structural characterization and metal inclusion properties of 18-, 20- and 22-membered oxaazacyclophanes and oxaazacalix[4]arene analogues: Macrocyclic amine and schiff base receptors with variable NxO y donor sets
Moreno-Corral, Ramon,Hoepfl, Herbert,MacHi-Lara, Lorena,Lara, Karen O.
, p. 2148 - 2162 (2011/05/09)
A series of oxaazacyclophanes and oxaazacalix[4]arene analogues with 18-, 20- and 22-membered rings have been synthesized from diamine and dialdehyde building blocks and structurally characterized by spectroscopic methods. One diamine precursor and four macrocycles have additionally been analysed by single-crystal X-ray diffraction. Two of the oxaazacalix[4]arene analogues were employed for metal ion complexation studies based on UV/Vis absorption spectroscopy, showing both compounds to be able to form complexes with Cu 2+ and Zn2+. Copyright
Chromogenic macrocyclic derivatives of azoles - Synthesis and properties
Wagner-Wysiecka, Ewa,Luboch, Elzbieta,Kowalczyk, Marzena,Biernat, Jan F.
, p. 4415 - 4420 (2007/10/03)
The synthesis of macrocyclic chromogenic derivatives of pyrrole and imidazole is described. The complexing properties of these compounds with metal cations were investigated spectrophotometrically in acetonitrile. The synthesized crown ethers were also te
The halogen-mediated opening of epoxides in the presence of pyridine-containing macrocycles
Sharghi, Hashem,Niknam, Khodabakhsh,Pooyan, Maryam
, p. 6057 - 6064 (2007/10/03)
The ring opening of epoxides with elemental iodine and bromine in the presence of three pyridine-containing macrocyclic diamides as new catalysts affords vicinal iodo alcohols and bromo alcohols in high yields. This new procedure occurs regioselectively under mild conditions in various aprotic solvents. The catalysts are easily recovered and can be reused several times.
Phenol-containing macrocyclic diamides as new catalysts in the highly regioselective conversion of epoxides to β-hydroxy thiocyanates
Sharghi,Nasseri,Niknam
, p. 7287 - 7293 (2007/10/03)
The regioselective ring-opening reactions of some epoxides with ammonium thiocyanate in the presence of a series of new phenol-containing macrocyclic diamides and also dibenzo-18-crown-6-, 18-crown-6-, benzo-15-crown-5-, and pyridine-containing macrocyclic diamide have been studied. The epoxides were subject to cleavage by NH4SCN in the presence of these catalysts under mild reaction conditions in various aprotic solvents. In this study, reagents and conditions have been discovered with which the individual β-hydroxy thiocyanates can be synthesized in high yield and with more than 90% regioselectivity. The results can be discussed in terms of a four-step mechanism: (1) formation of complex between catalyst and NH4SCN, (2) release of SCN- nucleophile from the complex, (3) reaction of the active nucleophile at the less sterically hindered site in the epoxide, and (4) regeneration of catalyst. The major advantages of this method are as follows: (1) high regioselectivity, (2) simple regeneration of catalyst, (3) its reuse through several cycles without a decrease in activity, and (4) ease of workup of the reaction.
Synthesis and crystal structure of a new noncyclic polyether
Zhang,Liu,Tan,Yu
, p. 416 - 417 (2007/10/03)
1,7-bis[2-(N-pyridinoylaniline)]-1,4,7-trioxaheptane has been prepared and its structure elucidated by X-ray analysis.
