Zur Kenntnis des Härtungsprozesses von Phenol‐Formaldehyd‐Harzen, X. Mitteilung

Zinke, A.; Ziegler, E.

doi:10.1002/cber.19440770322

Cited by 133 publications

(115 citation statements)

References 11 publications

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“…Traditionally simple tetra and di-ester linkages were more suited to extraction of those guest species [35][36][37][38]. The trends for the extraction of the divalent heavy-metal salts by the spirocyclic distal -OH calixarene host compounds (6)(7)(8) are presented graphically in Figure 2.…”

Section: Metal Picrate Extraction Studiesmentioning

confidence: 99%

“…dihydroxycalix [4]arene (8). Spirolactam derivatised calixarene 8 was prepared in a similar manner to that described for 6 using trifluoroacetate salt 3 [11a].…”

Section: 111723-tetra-tert-butyl-2527-di(7-benzyl-6-oxo-17-diazmentioning

confidence: 99%

“…They were first prepared by Baeyer in 1872, as by-products in the synthesis of baeklite [7]. Their synthesis was further improved by Zinke and Ziegler in 1944 [8,9], and then early conformational studies were published in 1955 by Cornforth [10]. Since Gutsche first published the synthesis of calix [4]arene-based macrocycles [11], the investigation of the complexation properties of these compounds has been of intense interest for a wide variety of ionic species and small organic guest molecules, through the formation of host-guest or supramolecular complexes.…”

Section: Introductionmentioning

confidence: 99%

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Bis(spirolactam) 1,3-double-armed calix[4]arene compounds and their application as extractants for the determination of heavy metal ions

Ward

Regan

et al. 2015

J Incl Phenom Macrocycl Chem

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Section: Metal Picrate Extraction Studiesmentioning

confidence: 99%

“…dihydroxycalix [4]arene (8). Spirolactam derivatised calixarene 8 was prepared in a similar manner to that described for 6 using trifluoroacetate salt 3 [11a].…”

Section: 111723-tetra-tert-butyl-2527-di(7-benzyl-6-oxo-17-diazmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Bis(spirolactam) 1,3-double-armed calix[4]arene compounds and their application as extractants for the determination of heavy metal ions

Ward

Regan

et al. 2015

J Incl Phenom Macrocycl Chem

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“…However, with the limited analytical instrumental techniques available at that time, he was unable to interpret the structure of the synthesized products. Zinke and Ziegler (1944) discovered that the products possessed cyclic tetrameric structures. Gutsche (1975) introduced the presently accepted name of calixarene.…”

Section: Introductionmentioning

confidence: 99%

Inclusion separation of alkali metals in emulsion liquid membranes by nanobaskets of calix[4]crown-3

Bahram

Pourabdollah

2012

Braz. J. Chem. Eng.

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-Nano-assisted inclusion separation of alkali metals from basic solutions was reported by an inclusion-facilitated emulsion liquid membrane process. The novelty of this study is application of nanobaskets of calixcrown in the selective and efficient separation of alkali metals as both the carrier and the surfactant. For this purpose, two diacids, p-tert-butylcalix [4]arene-1,2-crown-3 in the cone and the 1,2-alternate conformation, as well as another diacid, p-tert-butylcalix[4]arene-1,2-thiacrown-3 in the cone conformation, were synthesized. Their inclusion-extraction parameters were optimized, including the calixcrown scaffold (04, 4 wt%) as the carrier/demulsifier, commercial kerosene as the diluent in the membrane, sulphonic acid (0.2 M) and ammonium carbonate (0.4 M) as the strip and the feed phases; the phase and the treat ratios were 0.8 and 0.3, mixing speed (300 rpm), and initial solute concentration (100 mg/L). The selectivity of the membrane was examined for more than ten interfering cations was examined and the results reveled that, under the optimized operating condition, the degree of inclusion-extraction of alkali metals was as high as 98-99%.

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“…6 In the 1940s, Zinke and Ziegler discovered that the products possessed cyclic tetrameric structures. 7 In 1975, Gutsche introduced the presently accepted name of calixarene. 8 The small calixarenic cycles, calix [4]arene, possess a bowlshaped conformation 9 and those with pendent protonionizable groups, such as carboxylic acid, 10 phosphinoyl,…”

Section: Introductionmentioning

confidence: 99%

Structure Optimization of Di-ionizable Calixarene Nano-baskets for Competitive Solvent Extraction of Alkali and Alkaline Earth Metals

Bahram¹,

Pourabdollah²

2011

Bulletin of the Korean Chemical Society

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The competitive solvent extractions of alkali and alkaline earth metals by di-ionizable calix[4]arene nanobaskets were studied using nine conformers of calix[4]arene nano-baskets. The objective of this work is to assess the variation of macrocycle conformation, orientation and position of pendant moieties upon the extraction parameters (efficiency, selectivity and pH 1/2 ) of the complexes. The results revealed that alternation of ring conformation in calixarene scaffold affects the solvent extraction parameters towards alkali and alkaline earth metals, while changing the orientation of pendant moieties from ortho-to para-as well as cis-to transanalogues depicted no changes in those extraction parameters.

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Zur Kenntnis des Härtungsprozesses von Phenol‐Formaldehyd‐Harzen, X. Mitteilung

Cited by 133 publications

References 11 publications

Bis(spirolactam) 1,3-double-armed calix[4]arene compounds and their application as extractants for the determination of heavy metal ions

Bis(spirolactam) 1,3-double-armed calix[4]arene compounds and their application as extractants for the determination of heavy metal ions

Inclusion separation of alkali metals in emulsion liquid membranes by nanobaskets of calix[4]crown-3

Structure Optimization of Di-ionizable Calixarene Nano-baskets for Competitive Solvent Extraction of Alkali and Alkaline Earth Metals

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