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58149308946
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Four isomers are possible for a calix[4]arene derivative with the four bridges identically substituted see ref 4, These forms are configurational isomers and not conformers since their mutual interconversion requires cleavage of bonds
-
Four isomers are possible for a calix[4]arene derivative with the four bridges identically substituted (see ref 4). These forms are configurational isomers and not conformers since their mutual interconversion requires cleavage of bonds.
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20
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58149296656
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The conformation of calix[4]arenes is usually discussed in terms of four basic forms (cone, partial cone, 1,3-alternate, and 1,2-alternate, ref 1) arising form the different possible up or down arrangements of the aryl rings. Rotation through the annulus of the rings mutually interconverts these forms.
-
The conformation of calix[4]arenes is usually discussed in terms of four basic forms (cone, partial cone, 1,3-alternate, and 1,2-alternate, ref 1) arising form the different possible "up" or "down" arrangements of the aryl rings. Rotation through the annulus of the rings mutually interconverts these forms.
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21
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58149288756
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A calix[4]arene of unknown stereochemistry monofunctionalized at four bridges with OH groups was prepared by Görmar and coworkers via LiAlH 4 reduction of a ketocalixarene. See ref 3a
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4 reduction of a ketocalixarene. See ref 3a.
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48
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0001070727
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Statistical analysis of the crystal structure data of the methoxyphenyl group in different environments has shown that the perpendicular conformation of the methoxy group is preferred if the two ortho positions are substituted. See: Hummel, W, Huml, K, Bürgi, H.-B. Helv. Chim. Acta 1988, 71, 1291
-
Statistical analysis of the crystal structure data of the methoxyphenyl group in different environments has shown that the perpendicular conformation of the methoxy group is preferred if the two ortho positions are substituted. See: Hummel, W.; Huml, K.; Bürgi, H.-B. Helv. Chim. Acta 1988, 71, 1291.
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49
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58149314677
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This epimerization process most likely involves cleavage of the C-OH bonds and is probably catalyzed by acidic impurities in the solvent
-
This epimerization process most likely involves cleavage of the C-OH bonds and is probably catalyzed by acidic impurities in the solvent.
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-
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50
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58149286680
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It has been shown by Reuben for partially deuterated polyols ref 11, that the chemical exchange between proton and deuteron in the hydroxy groups is slow on the NMR timescale
-
It has been shown by Reuben for partially deuterated polyols (ref 11). that the chemical exchange between proton and deuteron in the hydroxy groups is slow on the NMR timescale.
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51
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58149311594
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Two species are isotopologues if they differ only in the number of isotopic substitutions (i.e., the isotopic composition). Isotopomers refer to isomers differing only in the position of the isotopic substitution in the skeleton. See: Müller. P. Pure Appl. Chem. 1994, 66, 1077.
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Two species are isotopologues if they differ only in the number of isotopic substitutions (i.e., the isotopic composition). Isotopomers refer to isomers differing only in the position of the isotopic substitution in the skeleton. See: Müller. P. Pure Appl. Chem. 1994, 66, 1077.
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52
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0347832970
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58149290345
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The percent of deuteration was determined from the ratio between the integration of the HOD signal and the sum of the total integration of the H 2O and HDO signals
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2O and HDO signals.
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58149288753
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