124006-37-7Relevant articles and documents
Water-Mediated Association Provides an Ion Pair Receptor
Kotch, Frank W.,Sidorov, Vladimir,Lam, Yiu-Fai,Kayser, Katherine J.,Li, Hojun,Kaucher, Mark S.,Davis, Jeffery T.
, p. 15140 - 15150 (2003)
In this paper, we report on the formation and properties of a water-stabilized dimer comprising calix[4]arene-guanosine conjugate cG 2. The 1,3-alternate calixarene cG 2 was poorly soluble in dry CDCl3 and gave an ill-resolved NMR spectrum, con
Molecular engineering. Part 7. Cavitands having four aromatic sp2 nitrogens as salt binding ligands
Paek, Kyungsoo,Yoon, Jaehyung,Suh, Yongju
, p. 916 - 922 (2001)
Nine new salt binders built on resorcin[4]arene or calix[4]arene and having four aromatic sp2 nitrogens as salt binding ligands were designed and characterized. Structurally rigid cavitands based on resorcin[4]arene showed much higher affinities toward metal cations compared to those based on flexible calix[4]arene. In particular, imidazolylcavitand 7 showed high affinity for alkali metal cations (-ΔG° = 7.0-10.9 kcal mol-1) and pyrazolylcavitand 8 showed unusually high selectivity for silver cations, which are presumably due to their different binding modes, nesting vs. inclusion fashion, respectively.
CHLOROMETHYLATION OF CALIXARENES AND SYNTHESIS OF NEW WATER SOLUBLE MACROCYCLIC HOSTS
Almi, Mario,Arduini, Arturo,Casnati, Alessandro,Pochini, Andrea,Ungaro, Rocco
, p. 2177 - 2182 (1989)
The chloromethylation of calixarene 1a and of the methyl ethers of calixarene 1b and calixarene 1c , using chloromethyl n-octyl ether and SnCl4 in chloroform at room temperature has been performed in good yield for the first time.The chloromethylated products 2a-c have been used as intermediates to introduce on calixarenes phosphonic acid groups which render these macrocycles water soluble and potentially useful in Host Guest Chemistry.
Improvement of catalytic activity of Candida rugosa lipase in the presence of calix[4]arene bearing iminodicarboxylic/phosphonic acid complexes modified iron oxide nanoparticles
Ozyilmaz, Elif,Bayrakci, Mevlut,Yilmaz, Mustafa
, p. 1 - 8 (2015/12/18)
In the present study, iron oxide magnetite nanoparticles, prepared through a co-precipitation method, were coated with phosphonic acid or iminodicarboxylic acid derivatives of calix[4]arene to modulate their surfaces with different acidic groups. Candida rugosa lipase was then directly immobilized onto the modified nanoparticles through sol-gel encapsulation. The catalytic activities and enantioselectivities of the two encapsulated lipases in the hydrolysis reaction of (R/S)-naproxen methyl ester and (R/S)-2-phenoxypropionic acid methyl ester were assessed. The results showed that the activity and enantioselectivity of the lipase were improved when the lipase was encapsulated in the presence of calixarene-based additives; the encapsulated lipase with the phosphonic acid derivative of calix[4]arene had an excellent rate of enantioselectivity against the (R/S)-naproxen methyl and (R/S)-2-phenoxypropionic acid methyl esters, with E = 350 and 246, respectively, compared to the free enzyme. The encapsulated lipases (Fe-Calix-N(COOH)) and (Fe-Calix-P) showed good loading ability and little loss of enzyme activity, and the stability of the catalyst was very good; they only lost 6-11% of the enzyme's activity after five batches.
Synthesis and metal extraction behavior of pyridine and 1,2,4-triazole substituted calix[4]arenes
Kumar, Ashok,Sharma, Pratibha,Kalal, Bhagwan Lal,Chandel, Lal Kumar
, p. 369 - 379 (2011/12/14)
Three series of heterocycle substituted calixarenes, derivatized at lower and upper rim, were synthesized and successfully evaluated for metal extraction towards alkali, alkaline, transition and heavy metal ions. The presence and placement of sulfur, heterocycle functionality at upper/lower rim played a crucial role toward the extractability and selectivity of metal ions. The lower rim substituted calixarenes have shown high extractability and poor selectivity. In contrast to this, upper rim substituted calixarenes exhibited good selectivity. Moreover, sulfur functionalized calixarenes have shown better selectivity for heavy metal ions than alkali and alkaline metal ions. Among upper rim substituted calixarenes, 17 and 18 were found to be suitable for Na+, K+ and Ag+, 19,13 for heavy metal ions i. e., Pb2+, Hg+, Hg2+ and Ag+, and 11,12 for Pb2+ and Ag+ only.
