Results 191 to 200 of about 44,745 (234)

Multi-state Energy Landscape for Photoreaction of Stilbene and Dimethyl-stilbene

Journal of Chemical Theory and Computation, 2022
We have recently developed the reaction space projector (ReSPer) method, which constructs a reduced-dimensionality reaction space uniquely determined from reference reaction paths for a polyatomic molecular system and projects classical trajectories into the same reaction space.
Takuro Tsutsumi, Yuriko Ono, Tetsuya Taketsugu   +2 more
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Stilbenes from Sphaerophysa salsula

Fitoterapia, 2002
A new stilbene, (trans)-4-[2-(3, 5-dimethoxyphenyl) ethenyl]-1,2-benzenediol (1), was isolated from the whole herbs of Sphaerophysa salsula, together with (trans)-4-[2-(3, 5-dimethoxy phenyl) ethenyl]-2-methoxyphenol (2) and daucosterol. The structure of 1 was determined on the basis of spectroscopic evidences.
Zhong-jun, Ma, Xian, Li, Ning, Li, Jin-hui, Wang   +3 more
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Water-soluble stilbene dendrimers

Chemical Communications, 2002
The third generation of novel photo-responsive water-soluble stilbene dendrimer (trans- and cis-G3 WSD) undergoes unusual one-way trans-to-cis isomerization to give 100% of cis isomer at the photostationary state on UV irradiation in water.
Junpei, Hayakawa, Atsuya, Momotake, Tatsuo, Arai   +2 more
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Natural stilbenes: an overview

Natural Product Reports, 2009
Natural stilbenes have been a hot research topic due to their intricate structures and diverse biological activities. Although their molecular backbone consists only of 1,2-diphenylethylene units, stilbenes show an enormous diversity with regard to the different units present, the degree of polymerisation, and the pattern of oligomer construction. From
Tao, Shen, Xiao-Ning, Wang, Hong-Xiang, Lou   +2 more
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ESR Studies of Electron Transfer: trans-Stilbene—Stilbene− System

The Journal of Chemical Physics, 1967
The rate of electron transfer between the stilbene anion radical and trans-stilbene has been measured in dimethoxyethane and tetrahydrofuran. The second-order rate constants are approximately 109 liters mole−1·sec−1, and the activation energies fall between 2 and 3 kcal mole−1.
R, Chang, C S, Johnson
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Phosphorescence of trans-stilbene, stilbene derivatives, and stilbene-like molecules at 77 K

The Journal of Physical Chemistry, 1989
Determination des durees de vie et des energies de l'etat triplet du stilbene, de ses derives substitues, des diaryl-1,2 ethylenes, des styrylpyridines, des dipyridylethylenes dans des solvants polaires et ...
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Untersuchungen über Stilbene. IV. 4‐Amino‐stilben‐aldehyd‐(4′)und 4‐Amino‐stilben‐carbonsäure‐(4′)

Journal für Praktische Chemie, 1956
AbstractBeide Verbindungen wurden durch Kuppelung der Diazoniumverbindungen des p‐Aminobenzaldehyds bzw. der p‐Aminobenzoesäure mit p‐Acetamino‐zimtsäure als Reaktionspartner dargestellt.
Günther Drefahl, Helmut Seeboth, Walter Degen   +2 more
openaire   +1 more source

Untersuchungen über Stilbene. XXI. Monoquartäre Ammoniumverbindungen der Stilben‐Reihe

Journal für Praktische Chemie, 1959
AbstractDarstellung und Eigenschaften quartärer Ammoniumsalze des [4‐Styryl‐benzyl]‐amins werden beschrieben.
Günther Drefahl, Hans Lückert
openaire   +1 more source

Relaxation pathways in photoexcited electron-rich stilbenes (DD stilbenes) as compared to DA stilbenes

Chemical Physics Letters, 1994
Abstract Spectra and shifts, fluorescence quantum yields and lifetimes of 4,4′-dimethylaminostilbene (DDS) and the bridged derivatives DDS-B15 and DDS-B24 were measured as a function of solvent polarity and temperature. The behavior of DDS and DDS-B15 is interpreted in terms of the intramolecular rotational relaxation around the single bond ...
Jean-François Létard, René Lapouyade, Wolfgang Rettig   +2 more
openaire   +1 more source

Untersuchungen über Stilbene, XXXI. Additionsreaktionen an α‐Nitro‐stilbene

Chemische Berichte, 1960
AbstractDie Bromwasserstoff‐, Hydroxylamin‐ und Ammoniak‐Addition an α‐Nitrostilbene wird beschrieben und durch sterische Zuordnung der Reaktionsprodukte der Additionsverlauf aufgeklärt.
Günther Drefahl, Heinz Ehrhardt
openaire   +1 more source