Topic
Substituent
About: Substituent is a research topic. Over the lifetime, 42877 publications have been published within this topic receiving 516716 citations. The topic is also known as: side chain & side group.
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TL;DR: N-Benzamido-N'-phenylthioureas represent a new generation of neutral thiourea-based anion receptors that show substantially improved anion binding performance important for anion sensing and recognition.
Abstract: A series of neutral N-(substituted-benzamido)-N‘-phenylthioureas (substituent = p-OC2H5, p-CH3, m-CH3, H, p-Cl, p-Br, m-Cl, and p-NO2) were designed as anion receptors, in which the thiourea binding site was attached to the benzamido moiety via an N−N bond. The absorption spectra of these N-benzamidothioureas in acetonitrile peaked at ca. 270 nm were found to show unprecedented red shifts by 7 373 to 14 325 cm-1 in the presence of anions such as AcO-, F-, and H2PO4-. Under the same conditions, the classic neutral thiourea receptors, N-(substituted-phenyl)-N‘-phenylthioureas, showed absorption spectral shifts in most cases of less than 800 cm-1 with one exception of 6501 cm-1. Control experiments, effects of protic solvent, and 1H NMR titration confirmed the formation of hydrogen-bonding complexes between the new N-benzamidothiourea receptors and anions. The binding constants with AcO-, for example, are at 105−107 mol-1 L order of magnitude, which are 13 to 590 times those of the corresponding classic N-ph...
140 citations
TL;DR: In this article, the first of a series of papers to assign C-chlorino and C-bromine vibrational frequencies in substituted halogenobenzenes, and to show how these vibrations are modified by the nature and orientation of the substituent groups.
140 citations
TL;DR: A series of pyrimidine functionalized palladium(II) complexes with aryl and alkyl substituents was synthesized by transmetalation via the corresponding silver complexes.
140 citations
TL;DR: In this paper, the influence of the nature of the para substituent and halide on the preferred reaction pathway and the number of ligands bound to Pd during the oxidative addition of p-Y−C6H4−X to pd(0), which is critical to many Pd-catalyzed cross-coupling reactions was examined theoretically with the aid of DFT calculations.
139 citations
TL;DR: In this article, a variety of multisubstituted cyclooctenes were prepared and employed as monomers for ring-opening metathesis polymerization using the Grubbs second or third generation catalysts.
Abstract: A variety of multisubstituted cyclooctenes were prepared and employed as monomers for ring-opening metathesis polymerization using the Grubbs second or third generation catalysts. The resulting polymers were characterized by NMR spectroscopy, size exclusion chromatography, and differential scanning calorimetry. Monomers possessing a substituent at the 3-position afforded highly regio- and stereoregular polyalkenamers, from which the corresponding sequence-specific vinyl quaterpolymers were obtained upon hydrogenation. Simultaneous control of tacticity was also demonstrated by employing monomers with defined stereochemistry.
139 citations