Journal ArticleDOI
Controlling factors in the synthesis of cucurbituril and its homologues.
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A wide range of reaction conditions are examined that include the effects of acid type, acid concentration, reactant concentrations, and temperature to both probe the mechanism and optimize the yields of isolated cucurbit[n]urils, where n = 5-10.Abstract:
The acid-catalyzed synthesis of cucurbit[n]urils from formaldehyde and glycoluril is poorly understood. In this paper, we examine a wide range of reaction conditions that include the effects of acid type, acid concentration, reactant concentrations, and temperature to both probe the mechanism and optimize the yields of isolated cucurbit[n]urils, where n = 5−10. A mechanism for the formation of these cucurbit[n]urils is presented. Individual cucurbit[n]urils were unambiguously identified in reaction mixtures using ESMS and 13C NMR.read more
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Book ChapterDOI
From the Dawn of Organic Chemistry to Astrobiology: Urea as a Foundational Component in the Origin of Nucleobases and Nucleotides
TL;DR: This chapter provides a historical perspective on the prebiotic chemistry of urea, from Wohler’s synthesis in the early nineteenth century to the most recent works.
Journal ArticleDOI
Host–guest complexation of di-cyclohexanocucurbit[6]uril and hexa-cyclohexanocucurbit[6]uril with alkyldiammonium ions: a comparative study
TL;DR: Isothermal titration calorimetry (ITC) studies point out that the host-guest complexations of both hosts with the latter five alkyldiammonium ions are enthalpically driven.
Journal ArticleDOI
Cucurbit[7]uril as a "protective agent": controlling photochemistry and detecting 1-adamantanamine.
TL;DR: The host-guest complex DPAD-CB[7] as a supramolecular sensor can detect the concentration of 1-adamantanamine with good sensitivity and selectivity because of the guest competitive complexation.
Journal ArticleDOI
Density functional theory investigations on binding and spectral features of complexes of ferrocenyl derivatives with cucurbit [7]uril
TL;DR: In this paper, the host-guest interactions between ferrocene and its derivatives containing electron donating and electron withdrawing substituents have been analyzed employing density functional theory incorporating various exchange correlation functionals.
Journal ArticleDOI
Inclusion compounds of cucurbit[n]urils with metal complexes
TL;DR: In this paper, a new class of supramolecular compounds (inclusion compounds of metal complexes encapsulated in organic macrocyclic cavitands cucurbit[n]urils) has been surveyed.
References
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Journal ArticleDOI
I. Ueber Condensationsproducte aus Glycoluril und Formaldehyd
Journal ArticleDOI
An efficient, enantioselective synthesis of the taxol side chain
TL;DR: Synthese de la chaine du taxol a partir du phenylacetylene avec comme etapes-cle une epoxydation asymetrique et la scission regioselective de l'epoxyde as mentioned in this paper.
Journal ArticleDOI
A Molecular Bowl with Metal Ion as Bottom: Reversible Inclusion of Organic Molecules in Cesium Ion Complexed Cucurbituril
Journal ArticleDOI
Cucurbituril as a ligand for the complexation of cations in aqueous solutions
TL;DR: The complex formation of the ligand cucurbituril with alkaline cations and other cations have been studied by means of solubility measurements in the presence of the salts in aqueous solutions at 25 °C.
Journal ArticleDOI
Host–guest complexes of cucurbituril with the 4-methylbenzylammonium lon, alkali-metal cations and NH4+
TL;DR: In this article, the existence of two different complexes of cucurbituril with 4-methylbenzylammonium ions was reported. But the 1 : 1 stability constants were not reported for the 2 : 1 complexes with different cations.