106774-58-7Relevant academic research and scientific papers
Synthesis and structural characterization of bisazocalix[4]arene with melamine: Metal ion extraction studies
Elc?in, Serkan,Karaku?, ?zlem ?zen,Kara, Izzet,Delig?z, Hasalettin
, p. 134 - 140 (2015)
In this study, the synthesis and characterization of novel bisazocalix[4]arene [2-amino-4,6-bis(5-azo-25,26,27- tribenzoyloxy-28-hydroxycalix[4]arene)-1,3,5-triazine] (5), symmetrically derived from the diazo coupling of 2,4,6-triamino-1,3,5-triazine (mel
Conformationally Selective Synthesis of Mononitrocalix[4]arene in Cone or Partial Cone
Royappa, Ana Rita N. S.,Ayer, Maxime,Fracassi, Alessandro,Ebert, Marc-Olivier,Aroua, Safwan,Yamakoshi, Yoko
, (2017)
Nitro-substituted calixarenes in a cone and a partial cone conformation were prepared selectively using distinct synthetic routes. The selective nitration of tris- or penta-substituted phenols of calix[4]arene or calix[6]arene provided mononitrocalix[n]arenes (n?=?4, 6). Subsequent addition of ethylene glycol (EG) moieties to mononitrocalix[4]arene provided tetraEGylcalix[4]arene in locked partial cone conformation. By an alternative route – initial addition of EG moieties to the non-derivatized calix[4]arene followed by the uncontrolled nitration – provided mononitro- and dinitro-tetraEGylcalix[4]arenes locked in the cone conformation. These nitrocalix[4]arenes with locked cone or partial cone conformation are useful building blocks for further assembly of supramolecular systems, especially in the area of material sciences.
An approach to the synthesis of chemically modified bisazocalix[4] arenes and their extraction properties
Tilki, Tahir,?ener, Izzet,Karci, Fikret,Gülce, Ahmet,Delig?z, Hasalettin
, p. 9624 - 9629 (2005)
Bisazocalix[4]arenas [N,N′-bis(5-azo-25,26,27-tribenzoyloxy-28- hydroxycalix[4]arene)benzene (1), N,N′-bis(5-azo-25,26,27-tribenzoyloxy- 28-hydroxycalix [4]arene)biphenyl (2) and N,N′-bis(5-azo-25,26,27- tribenzoyloxy-28-hydroxycalix[4]arene)-2,2′-dinitro
Synthesis and characterization of azocalix[4]arene ester and ketone derivatives incorporated in a polymeric backbone with bisphenol-A and their cation-binding properties
Tunc, Mukaddes Meryem,Karakus, Oezlem Oezen,Deligoez, Hasalettin
, p. 729 - 735 (2013/02/26)
This study comprises synthesis and characterization of azocalix[4]arene compounds having copolymeric structures. The novel bisazocalixphenol-A and copolymer containing pendant azocalix[4]arene units with ester (5) and ketone (6) functionalities at their l
Synthesis of calixarene-capped carbosilane dendrimers
Lambert, Joseph B.,Kang, Seung-Hyun,Kuangbiao, Ma.,Liu, Chunqing,Condie, Allison G.
supporting information; experimental part, p. 2527 - 2532 (2009/09/25)
A new class of polycalix[4]arene hosts has been constructed based on a carbosilane dendrimer architecture, in which each dendritic branch terminates with a calix[4]arene entity. This study reports the synthesis and characterization of the zeroth generatio
Mono-ionizable calix[4]arene-benzocrown-6 ligands in 1,3-alternate conformations: synthesis, structure and silver(I) extraction
Surowiec, Malgorzata,Custelcean, Radu,Surowiec, Kazmiriez,Bartsch, Richard A.
scheme or table, p. 7777 - 7783 (2009/12/24)
Two series of novel mono-ionizable calix[4]arene-benzocrown-6 ligands in 1,3-alternate conformations are synthesized. In one series, the proton-ionizable group (PIG) is attached to the para position of one aromatic ring in the calixarene framework, thereby positioning it over the polyether ring cavity. In the other series, the PIG is a substituent on the benzo group in the polyether ring. This orients the PIG away from the crown ether cavity. In addition to carboxylic acid functions, the PIGs include N-(X)sulfonyl carboxamide groups. With X group variation from methyl to phenyl to 4-nitrophenyl to trifluoromethyl, the acidity of the PIG is 'tuned'. Solvent extraction of Ag+ from aqueous solutions into chloroform is used to probe the influence of structural variation within the mono-ionizable calixcrown ligand on metal ion extraction efficiency, including the identity and acidity of the PIG and its orientation with respect to the polyether ring.
Calix[4]quinone. Part 1: Synthesis of 5-hydroxycalix[4]arene by calix[4]quinone monoketal route
Lee, Ming-Dar,Yang, Ker-Ming,Tsoo, Ching-Yu,Shu, Chun-Mei,Lin, Lee-Gin
, p. 8095 - 8099 (2007/10/03)
The oxidation of calix[4]arene tribenzoate 1 with chlorine dioxide yielded the corresponding calix[4]monoquinone tribenzoate 2. Reaction of monoquinone 2 with ethylene glycol under acidic conditions produced the protected monoketal derivative 3. The basic
Regioselective upper-rim functionalizations of calix[4]arene by diphenylphosphino groups
Gagnon,Veniza,Drouin,Harvey
, p. 1439 - 1446 (2007/10/03)
The regioselective upper-rim functionalization of calix[4]arene have been performed to prepare all the multisubstituted diphenylphosphine derivatives. In addition, the X-ray structures of 5,17-dibromo-11,23-bis(diphenylphosphino)-25,26,27,28-tetra-n-propoxycalix [4]arene and 5,11,17,23-tetrakis(diphenylphosphino)-25,26,27,28-tetra-i-propoxy-calix[4] arene have been determined. Regioselective functionalizations have been achieved using methods that involve appropriate choices of bases, alkyllithium-solvent systems, stoichiometry, and reaction times. A new and convenient method for selectively preparing derivitized calix[4]arenes at proximal positions in relative large scale quantity has been developed and involves a transesterification of the distal diester derivative into the proximal isomer.
CALIXARENES 12 THE SYNTESIS OF FUNCTIONALIZED CALIXARENES
Gutsche, C. David,Lin, Lee-Gin
, p. 1633 - 1640 (2007/10/02)
Procedures are described for the removal of the p-t-butyl groups from p-t-butylcalixarene, p-t-butylcalixarene, and p-t-butylcalixarene and the introduction of functional groups in their place.Although attempts to functionalize the p-positions of the calixarenes have generally failed, the corresponding methyl ethers are amenable to facile acetylation to provide syntheses of the p-acetyl-, p-carboxy-, and p-carbomethoxycalixarenes and calixarenes.Acetylation and benzoylation of calixarene and calixarene occur at the phenolic oxygens rather than the p-positions, leading under most reaction conditions to the completely O-substituted product.Calixarene reacts with benzoyl chloride in the presence of pyridine, however, to yield the tribenzoate.Conversion of the tribenzoate to the corresponding tribenzoyloxy monoallyl ether followed by a Claisen rearrangement and hydrolysis yields monoallylcalixarene, a compound of particular interest because of its potential for the synthesis of calixarenes containing a single substituent on the "upper rim".
