A New Synthesis of Oxacalix[3]arene Macrocycles and Alkali-Metal-Binding Studies
摘要:
The title oxacalix[3]arene macrocycles 1 have been synthesized in yields of 12-32% by an acid-catalyzed, high-dilution condensation of 2,6-bis(hydroxymethyl)-p-subtituted-phenols, where R = t-Bu, i-Pr, Et, Me, and Cl. The macrocycles are isolated in high purity without chromatography, as the sodium or potassium,salts of their monoanions. Metal-binding studies indicate that, Like the related calixarenes, the oxacalix[3]arenes bind alkali metals only in the presence of base (Na(+)approximate to K+ > Li+).
Trigonal versus tetragonal or pentagonal coordination of the uranyl ion by hexahomotrioxacalix[3]arenes: solid state and solution investigations
作者:Bernardo Masci、Martine Nierlich、Pierre Thuéry
DOI:10.1039/b108947c
日期:2002.1.24
perturbation of these factors. Stable complexes could be investigated by 1H NMR on dissolving the crystals obtained using secondary and tertiary amines in halogenated solvents. Ammonium ion inclusion in the aromatic cavity of an apparently C3v symmetric complex was observed. Although less symmetric forms could not be frozen out at low temperature, the equilibration between two different types of structures
New synthetic route to homooxacalix[n]arenes via reductive coupling of diformylphenols
作者:Naoki Komatsu
DOI:10.1016/s0040-4039(00)02336-4
日期:2001.2
homocoupling of 4-substituted-2,6-diformylphenols with Et3SiH in the presence of Me3SiOTf gave homooxacalix[n]arenes (1n·R, n=3, 4) in moderate yields. Heterocoupling reaction of 4-substituted-2,6-diformylphenols with tris(trimethylsilyl) ether of 4-substituted-2,6-bis(hydroxymethyl)phenols afforded homooxacalix[n]arenes (23·R1·R2·Rm and 24·R1·R2·R1·Rm, m=1, 2) with different substituents in a one-pot fashion
在Me 3 SiOTf存在下,4-取代的2,6-二甲酰基苯酚与Et 3 SiH的还原均偶联反应以中等收率得到了高恶唑烷[ n ]芳烃(1 n ·R,n = 3,4)。4-取代的2,6-二甲酰基苯酚与4-取代的2,6-双(羟甲基)苯酚的三(三甲基甲硅烷基)醚的异质偶联反应得到高氧杂芳基[ n ]芳烃(2 3 ·R 1 ·R 2 ·R m和2 4 ·R 1 ·R 2 ·R 1 ·R m,m= 1,2)以一锅的方式带有不同的取代基。
Oxacalix[3]arene Complexes with the Re<sup>I</sup>(CO)<sub>3</sub> Fragment
作者:Matthias Hinrichs、Florian R. Hofbauer、Peter Klüfers、Mihael Suhanji
DOI:10.1021/ic0603048
日期:2006.8.1
Oxacalix[3]arenes p-methyloxacalix[3]arene (L-1), p-isopropyloxacalix[3] arene (L-2), and p-ethoxycarbonyloxacalix[3]arene (L-3) are able to bind the Re-I(CO)(3) moiety with two of their three phenol-O atoms and one of their ether-O atoms. The monoanionic complexes were isolated in the salts (DBUH)[Re(CO)(3)((LH-2)-H-1)]L-.(1)(1) and (NEt4)[Re(CO)(3)( (LH-2)-H-2)](.) L(2.)0.5 MeCN (2) (DBU = 1,8-diazabicyclo[5.4.0]undec-7-ene). Over the course of its reaction with (NEt4)(2)[Re(CO)(3)Br-3] and DBU, p-ethoxycarbonyloxacalix[3]arene decomposes to form [Re(CO)(3)((LH-2)-H-4)}(2)] (3) L-4 = 1-(5-ethoxycarbonyl-2-hydroxy-3-hydroxymethyl-benzyl)-2,3,4,6,7,8,9,10-octahydro-pyrimido[1,2-a]azepin-1-ium. The expected monoanion [Re(CO)(3)((LH-2)-H-3)](-) (4) was identified by C-13 NMR and mass spectra.
On the prerequisites for the formation of solution complexes from [60]fullerene and calix[n]arenes: A novel allosteric effect between [60]fullerene and metal cations in calix[n]aryl ester complexes
calix[n]arenes which can interact with [60]fullerene in solution we have screened a number of different calix[n]arenes by spectroscopic methods. We eventually discovered such three calix[n]arenes (15·But·H, 16·But·H, and 23·But·H) which could accept [60]fullerene even in solution. They commonly possess a cone conformation and a benzene ring inclination suitable to [60]fullerene inclusion. Furthermore, it was
为了找到可以与溶液中的[60]富勒烯相互作用的杯芳烃[n]芳烃,我们已经通过光谱法筛选了许多不同的杯芳烃[n]芳烃。我们最终发现了这三种杯芳烃[n]芳烃(1 5 ·Bu t ·H,1 6 ·Bu t ·H和2 3 ·Bu t·H),即使在溶液中也可以接受[60]富勒烯。它们通常具有适合[60]富勒烯夹杂物的圆锥构象和苯环倾斜度。此外,发现在某些特定金属阳离子的存在下,不能与[60]富勒烯相互作用的杯[n]芳基酯衍生物成为优异的[60]富勒烯受体。这归因于金属诱导的构象变化,以预组织圆锥杯[n]芳基酯。这种现象是一种积极的变构现象,这是富勒烯化学的第一个例子。我们相信这些发现将为新的富勒烯-杯[n]芳烃共轭化学打开一扇门。
A New Synthesis of Oxacalix[3]arene Macrocycles and Alkali-Metal-Binding Studies
作者:Philip D. Hampton、Zsolt Bencze、Weidong Tong、Charles E. Daitch
DOI:10.1021/jo00096a026
日期:1994.8
The title oxacalix[3]arene macrocycles 1 have been synthesized in yields of 12-32% by an acid-catalyzed, high-dilution condensation of 2,6-bis(hydroxymethyl)-p-subtituted-phenols, where R = t-Bu, i-Pr, Et, Me, and Cl. The macrocycles are isolated in high purity without chromatography, as the sodium or potassium,salts of their monoanions. Metal-binding studies indicate that, Like the related calixarenes, the oxacalix[3]arenes bind alkali metals only in the presence of base (Na(+)approximate to K+ > Li+).