Infrared Photodissociation Spectroscopy ofn-Propylbenzene−Ar Cluster Cations:  Charge Delocalization between the Aromatic Ring and the Alkyl Chain

2001 ◽  
Vol 105 (20) ◽  
pp. 4882-4886 ◽  
Author(s):  
Eiji Fujimaki ◽  
Asuka Fujii ◽  
Takayuki Ebata ◽  
Naohiko Mikami
Keyword(s):  
Aromatic Ring ◽  
Alkyl Chain ◽  
Charge Delocalization

Effect of aromatic ring in the alkyl chain on surface properties of arylalkyl surfactant solutions

2006 ◽  
Vol 9 (3) ◽  
pp. 245-248 ◽  
Author(s):  
Zhigang Xu ◽  
Pengfei Li ◽  
Weihong Qiao ◽  
Zongshi Li ◽  
Lubo Cheng
Keyword(s):  
Surface Properties ◽  
Aromatic Ring ◽  
Alkyl Chain ◽  
Surfactant Solutions

scholarly journals Degradation of octylbenzene sulfonate photoinduced by iron(III) aquacomplexes: Evidence for the fragmentation of the alkyl chain

2005 ◽  
Vol 7 (2) ◽  
pp. 71-78 ◽  
Author(s):  
Nadra Debbache ◽  
Gilles Mailhot ◽  
Kamel Djebbar ◽  
Bernadette Lavedrine ◽  
Michèle Bolte
Keyword(s):  
Electron Transfer ◽  
Quantum Yield ◽  
Aromatic Ring ◽  
Alkyl Chain ◽  
Solar Light ◽  
Complete Disappearance ◽  
Photochemical Degradation

The degradation of octylbenzene sulfonate (OBS) photoinduced by iron(III) aquacomplexes was investigated upon irradiation at 365 nm and by solar light. The photochemical degradation appears to be due toHO•radicals arising from the electron transfer inFe(OH)2+. If oxygen does not affect the initial quantum yield of OBS degradation, it is necessary to pursue the reaction up to, first the complete disappearance of OBS and secondly OBS mineralization. The nature of the major photoproducts gives evidence for a competitive attack ofHO•radicals on the alkyl chain resulting in a shortening of the chain. Among the possible sites on the chain, hydrogen on the carbon inαposition with respect to the aromatic ring was the main point of attack with the formation of 4-acetylbenzene sulfonate and 4-carboxylicbenzene sulfonate.

Hydrogen Rearrangements in the Mass Spectra of Alkylbenzenes

1971 ◽  
Vol 25 (2) ◽  
pp. 253-258 ◽  
Author(s):  
David A. Lightner ◽  
Gary B. Quistad ◽  
Elizabeth Irwin
Keyword(s):  
Aromatic Ring ◽  
Mass Spectra ◽  
Alkyl Chain ◽  
Deuterium Labeling ◽  
Hydrogen Atoms ◽  
Ortho Hydrogen ◽  
Alkyl Chains ◽  
Upper Limits ◽  
Hydrogen Deuterium ◽  
E 92

By means of extensive deuterium labeling, the γ-carbon has been shown to be the principal site of transferred hydrogen (deuterium) regardless whether the hydrogen (deuterium) is primary, secondary, or tertiary. Although a significant transfer is also observed from the β, δ, ε, and more remote (to θ) carbons of the alkyl chain, such transfer is not attended by C–C cleavage (fragmentation) and is interpreted as an exchange between the aromatic ring ( ortho-hydrogen atoms) and the alkyl chain hydrogen atoms (deuterium atoms). The data herein also set small upper limits 011 the formation of m/ e 91 (C7H7+) from m/ e 92 (C7Hs+−) at both high and low ionizing voltages as well as in long and short alkyl chains.

scholarly journals Phenyl radical + propene: a prototypical reaction surface for aromatic-catalyzed 1,2-hydrogen-migration and subsequent resonance-stabilized radical formation

2018 ◽  
Vol 20 (19) ◽  
pp. 13191-13214 ◽  
Author(s):  
Zachary J. Buras ◽  
Te-Chun Chu ◽  
Adeel Jamal ◽  
Nathan W. Yee ◽  
Joshua E. Middaugh ◽  
...  
Keyword(s):  
Aromatic Ring ◽  
Alkyl Chain ◽  
Radical Formation ◽  
Phenyl Radical ◽  
Hydrogen Migration ◽  
Reaction Surface

H-Shifts in the alkyl chain catalyzed by an aromatic ring (green pathway).

scholarly journals Synthesis of New Brassinosteroid 24-Norcholane Type Analogs Conjugated in C-3 with Benzoate Groups

Molecules ◽  
2021 ◽  
Vol 26 (4) ◽  
pp. 1173
Author(s):  
Karoll Ferrer ◽  
Katy Díaz ◽  
Miroslav Kvasnica ◽  
Andrés F. Olea ◽  
Mauricio Cuellar ◽  
...  
Keyword(s):  
Aromatic Ring ◽  
Electron Donor ◽  
Metabolic Pathways ◽  
Alkyl Chain ◽  
Biological Activities ◽  
Positive Control ◽  
Structural Modifications ◽  
Growth Promoting ◽  
Side Alkyl Chain

The metabolism of brassinosteroid leads to structural modifications in the ring skeleton or the side alkyl chain. The esterification and glycosylation at C-3 are the most common metabolic pathways, and it has been suggested that conjugate brassinosteroids are less active or inactive. In this way, plants regulate the content of active brassinosteroids. In this work, the synthesis of brassinosteroid 24-norcholane type analogs conjugated at C-3 with benzoate groups, carrying electron donor and electron attractant substituents on the aromatic ring, is described. Additionally, their growth-promoting activities were evaluated using the Rice Lamina Inclination Test (RLIT) and compared with that exhibited by brassinolide (used as positive control) and non-conjugated analogs. The results indicate that at the lowest tested concentrations (10−8–10−7 M), all analogs conjugated at C-3 exhibit similar or higher activities than brassinolide, and the diasteroisomers with S configuration at C-22 are the more active ones. Increasing concentration (10−6 M) reduces the biological activities of analogs as compared to brassinolide.

Template mediated crystal engineering

1994 ◽  
Vol 52 ◽  
pp. 480-481
Author(s):  
Brigid R. Heywood ◽  
S. Champ
Keyword(s):  
Crystal Engineering ◽  
Electrostatic Interactions ◽  
Alkyl Chain ◽  
Crystallographic Axis ◽  
Two Dimensional ◽  
Engineering Process ◽  
Solution Interface ◽  
Extensive Program ◽  
Geometric Homology ◽  
Long Alkyl Chain

Recent work on the crystallisation of inorganic crystals under compressed monomolecular surfactant films has shown that two dimensional templates can be used to promote the oriented nucleation of solids. When a suitable long alkyl chain surfactant is cast on the crystallisation media a monodispersied population of crystals forms exclusively at the monolayer/solution interface. Each crystal is aligned with a specific crystallographic axis perpendicular to the plane of the monolayer suggesting that nucleation is facilitated by recognition events between the nascent inorganic solid and the organic template.For example, monolayers of the long alkyl chain surfactant, stearic acid will promote the oriented nucleation of the calcium carbonate polymorph, calcite, on the (100) face, whereas compressed monolayers of n-eicosyl sulphate will induce calcite nucleation on the (001) face, (Figure 1 & 2). An extensive program of research has confirmed the general principle that molecular recognition events at the interface (including electrostatic interactions, geometric homology, stereochemical complementarity) can be used to promote the crystal engineering process.

Dispersibility Evaluation of Graphene Oxides with Alkyl Chain Groups by Using Optical Transparency

2015 ◽  
Vol E98.C (2) ◽  
pp. 127-128 ◽  
Author(s):  
Asami OHTAKE ◽  
Seiko UCHINO ◽  
Kunio AKEDO ◽  
Masanao ERA ◽  
Koichi SAKAGUCHI
Keyword(s):  
Alkyl Chain ◽  
Optical Transparency ◽  
Graphene Oxides
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