First- and second-sphere co-ordination of a lanthanum cation by a calix[4]arene tetraamide in the partial-cone conformation

1997 ◽  
pp. 1489-1492 ◽  
Author(s):  
Paul D. Beer ◽  
Michael G. B. Drew ◽  
Mark I. Ogden
Keyword(s):  
Cone Conformation ◽  
Partial Cone ◽  
Lanthanum Cation

Calixarene Phosphorylation: Cation Control of Reaction Pathways

1993 ◽  
Vol 46 (11) ◽  
pp. 1673 ◽  
Author(s):  
LT Byrne ◽  
JM Harrowfield ◽  
DCR Hockless ◽  
BJ Peachey ◽  
BW Skelton ◽  
...  
Keyword(s):  
Phase Transfer ◽  
Tetrabutylammonium Bromide ◽  
Crystal Structure Analysis ◽  
Bidentate Ligand ◽  
Tetraethylammonium Bromide ◽  
Cone Conformation ◽  
Formation Reaction ◽  
Partial Cone ◽  
Major Reaction Product ◽  
Major Reaction

The hydroxide ion catalysed phosphorylation of p-t- butylcalix [4] arene by diethyl chlorophosphate under heterogeneous conditions shows a marked sensitivity to the nature of the phase transfer catalyst used. Thus, substitution of tetraethylammonium bromide for the tetrabutylammonium bromide prescribed for the synthesis of the calixarene tetraphosphate leads to a major reaction product becoming a bis (phosphate) in which the calixarene binds as a unidentate ligand to one phosphorus and as a bidentate ligand to the other. An X-ray crystal structure analysis on this new compound shows the calixarene to adopt a somewhat distorted 'cone' conformation with an unusual orientation of one of the t-butyl substituents into the cone cavity. It also reveals that a significant diastereoselectivity must operate in the formation reaction. The only other reaction product detected in this system appears to be the calixarene tetraphosphate in a partial cone conformation.

Metal Ion Binding to Calixarenes: Pendent Arm Coordination Assisted by Self-Inclusion

1994 ◽  
Vol 47 (6) ◽  
pp. 1185 ◽  
Author(s):  
JM Harrowfield ◽  
M Mocerino ◽  
BW Skelton ◽  
CR Whitaker ◽  
AH White
Keyword(s):  
Structural Characterization ◽  
Metal Ion ◽  
Room Temperature ◽  
Ion Binding ◽  
Metal Ion Binding ◽  
Cone Conformation ◽  
X Ray ◽  
Partial Cone ◽  
Arm Coordination

The synthesis and room-temperature single-crystal X-ray structural characterization of 25,27- di(allyloxy)-5,17-di-t-butyl-26,28-dimethoxycalix[4]arene are recorded. Crystals are monoclinic, C2/c, a 29.089(5), b 10.742(2), c 26.218(8) Ǻ, β 110.09(2)°, Z = 8; the structure was refined to a residual of 0.065 for 4103 independent 'observed' [I > 3σ(I)] reflections. The flattened partial cone conformation of the molecule allows inclusion of one of the methoxy substituents in a way which could block inclusion of a metal ion capable of polyhapto aromatic coordination and which may therefore explain why solution n.m.r. measurements indicate that silver(I) binds to the pendent alkene groups.

Complexation and DFT studies of lower rim hexahomotrioxacalix[3]arene derivatives bearing pyridyl groups with transition and heavy metal cations. Cone versus partial cone conformation

2013 ◽  
Vol 26 (4) ◽  
pp. 295-305 ◽  
Author(s):  
Paula M. Marcos ◽  
Filipa A. Teixeira ◽  
Manuel A. P. Segurado ◽  
José R. Ascenso ◽  
Raul J. Bernardino ◽  
...  
Keyword(s):  
Heavy Metal ◽  
Metal Cations ◽  
Dft Studies ◽  
Cone Conformation ◽  
Cone Versus ◽  
Heavy Metal Cations ◽  
Partial Cone

Anion receptors based on ureidocalix[4]arenes immobilised in the partial cone conformation

2013 ◽  
Vol 37 (1) ◽  
pp. 220-227 ◽  
Author(s):  
Oldřich Hudeček ◽  
Jan Budka ◽  
Hana Dvořáková ◽  
Petra Cuřínová ◽  
Ivana Císařová ◽  
...  
Keyword(s):  
Anion Receptors ◽  
Cone Conformation ◽  
Partial Cone

Synthesis of inherently chiral calixarenes via direct mercuration of the partial cone conformation

2016 ◽  
Vol 52 (11) ◽  
pp. 2366-2369 ◽  
Author(s):  
Petr Slavík ◽  
Michal Kohout ◽  
Stanislav Böhm ◽  
Václav Eigner ◽  
Pavel Lhoták
Keyword(s):  
Cone Conformation ◽  
Partial Cone ◽  
Inherently Chiral ◽  
Inherently Chiral Calixarenes

Regioselective mercuration of calix[4]arene in the partial cone conformation enabled a straightforward access to a novel type of inherently chiral calixarenes with a highly distorted cavity.

scholarly journals SYNTHESIS OF THIOMETHYLATED CALIX[4]RESORCINARENE BASED ON FENNEL OIL VIA CHLOROMETHYLATION

2011 ◽  
Vol 11 (1) ◽  
pp. 1-8 ◽  
Author(s):  
Suryadi Budi Utomo ◽  
Jumina Jumina ◽  
Dwi Siswanta ◽  
Mustofa Mustofa ◽  
Naresh Kumar
Keyword(s):  
Melting Point ◽  
Sodium Hydroxide ◽  
1H Nmr ◽  
Sodium Hydroxide Solution ◽  
Starting Material ◽  
Cone Conformation ◽  
Hydroxide Solution ◽  
Partial Cone ◽  
Ft Ir ◽  
Fennel Oil

A research has been conducted to synthesize thiomethylated-C-4-methoxyphenylcalix[4]resorcinarene using fennel oil as a starting material. The synthesis was carried out in four steps i.e. (1) oxidation of anethole to yield p-anisaldehyde, (2) HCl-catalyzed condensation of p-anisaldehyde with resorcinol, (3) chloromethylation of C-4-methoxyphenylcalix[4]resorcinarene with paraformaldehyde and HCl in the presence of ZnCl2 to yield tetrakis-chloromethyl-C-4-methoxyphenylcalix[4]resorcinarene, and (4) reaction of tetrakis-chloromethyl-C-4-methoxyphenylcalix[4]resorcinarene with thiourea followed by hydrolysis with sodium hydroxide solution to yield tetrakis-thiomethyl-C-4-methoxyphenylcalix[4]resorcinarene. The prepared compounds were characterized based on melting point, FT-IR, and NMR spectrometers. According to the analysis of 1H-NMR spectrometer, C-4-methoxyphenylcalix[4]resorcinarene and tetrakis-chloromethyl-C-4-methoxyphenylcalix[4]resorcinarene were observed in the chair or flattened partial cone conformation, while tetrakis-thiomethyl-C-4-methoxyphenylcalix[4]resorcinarene tend to exist in the crown or cone conformation.

The Metal Template Effect on O-Alkylation of Hexahomotrioxacalix[3]arene with 4-(chloromethyl)pyridine to afford tris[(4-pyridylmethyl)oxy]hexahomotrioxacalix[3]arenes and their conformational studies

2000 ◽  
Vol 2000 (1) ◽  
pp. 10-12 ◽  
Author(s):  
Takehiko Yamato ◽  
Fenglei Zhang ◽  
Tomoki Sato ◽  
Seiji Ide
Keyword(s):  
Alkali Metal ◽  
Template Effect ◽  
Cone Conformation ◽  
Conformational Studies ◽  
Alkali Metal Carbonates ◽  
Metal Carbonates ◽  
Partial Cone

O-Alkylation of the flexible macrocycle 1 with 4-(chloromethyl)pyridine gave di- and tri- O-alkylated products with cone or partial-cone conformation which ratio was affected by NaH or alkali metal carbonates used as a base.

Synthesis and Structure of the Potassium Salt with Monodeprotonated 1,2,3-Tri(ethoxycarbonylpropyl)-p-t-butylcalix[6]arene

2008 ◽  
Vol 61 (7) ◽  
pp. 537 ◽  
Author(s):  
Ze-Bao Zheng ◽  
Ren-Tao Wu ◽  
Ji-Kun Li ◽  
Yi-Feng Sun
Keyword(s):  
Potassium Salt ◽  
Crystallographic Analysis ◽  
Potassium Ion ◽  
High Yield ◽  
Cone Conformation ◽  
X Ray ◽  
Partial Cone ◽  
Phenyl Rings ◽  
Close Contacts

Alkylation of p-t-butylcalix[6]arene with ethyl 4-bromobutanoate in the presence of K2CO3 results in a potassium salt of the monodeprotonated 1,2,3-tri(ethoxycarbonylpropyl)-p-t-butylcalix[6]arene in high yield. X-Ray crystallographic analysis shows that this compound exists as a double partial cone conformation. The potassium ion is positioned near the centre of the cavity of the macrocycle and binds to four phenolic oxygens. Close contacts between the potassium ion and phenyl rings observed in this compound are indicative of the presence of the cation–π interaction. The molecules are connected via intermolecular K+···O interactions into infinite chains.

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