Results 271 to 280 of about 11,656 (303)
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The Photosensitivity of Polyvinyl Cinnamate
Nippon kagaku zassi, 1966ポリケイ皮酸ビニルの感光性をその紫外吸収スペクトルから考察した。同時にケイ皮酸の光二量化と比較した。PVAフィルムに混合されたケイ皮酸の光照射により,ケイ皮酸の273mμの吸収帯は短波長266mμに移動し,その強度は減少することが認められた。短波長への移動はtrans-cis異性によるもので,吸収帯の消失は二量体生成にともなうα,β不飽和二重結合の消失に基づくものである。ポリケイ皮酸ビニルの場合も照射前277mμにある吸収は照射により消失したが,短波長移動は起らなかった。種々の増感剤を添加した樹脂に分光増感域の光を照射しても,樹脂固有の変化と同一であった。さらに吸収帯の消失を利用して,未変化ケイ皮酸基を比色定量して量子収率を求めたところ,量子収率φは濃度依存性を有し,ケイ皮酸基濃度C(初期濃度C0 ...
Shinichi Kikuchi, Kenichiro Nakamura
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Angewandte Chemie, 2012
Turn to switch: A mutant of phenylalanine aminomutase was engineered that can catalyze the regioselective amination of cinnamate derivatives (see scheme, red) to, for example, β-amino acids. This regioselectivity, along with the X-ray crystal structures,
Bian Wu +9 more
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Turn to switch: A mutant of phenylalanine aminomutase was engineered that can catalyze the regioselective amination of cinnamate derivatives (see scheme, red) to, for example, β-amino acids. This regioselectivity, along with the X-ray crystal structures,
Bian Wu +9 more
semanticscholar +1 more source
, 2013
A superacid (triflic acid) promoted dual C–C bond formation via intermolecular Friedel–Crafts alkylation (Michael addition type) and intramolecular acylation for the efficient synthesis of 3-substituted indan-1-ones is presented.
B. V. Ramulu, A. Reddy, G. Satyanarayana
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A superacid (triflic acid) promoted dual C–C bond formation via intermolecular Friedel–Crafts alkylation (Michael addition type) and intramolecular acylation for the efficient synthesis of 3-substituted indan-1-ones is presented.
B. V. Ramulu, A. Reddy, G. Satyanarayana
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Organic Letters, 2012
Free ortho-hydroxy cinnamate ester derivatives are evaluated in the synthesis of structurally diverse 4-aryl-coumarins via a tandem Heck-Matsuda cyclization reaction.
D. A. Barancelli +3 more
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Free ortho-hydroxy cinnamate ester derivatives are evaluated in the synthesis of structurally diverse 4-aryl-coumarins via a tandem Heck-Matsuda cyclization reaction.
D. A. Barancelli +3 more
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Metabolism of Cinnamic Acid and Hydroxy-Cinnamic Acids by Lactobacillus pastorianus var. quinicus
Nature, 1959PREVIOUS work has shown that caffeic acid, 3 : 4 dihydroxy-cinnamic acid is metabolized by Lactobacillus pastorianus var. quinicus 1,2 with the formation of dihydrocaffeic acid and ethyl catechol3. A pure culture of this organism was inoculated into a basal medium1 with the addition of 0.025 per cent cinnamic acid and 0.25 per cent fructose.
J. G. Carr, G. C. Whiting
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Novel antioxidant reactions of cinnamates in wine.
Journal of Agricultural and Food Chemistry, 2011Plant-derived polyphenolic compounds have received much attention for their ability to sequester high-energy free radicals in a great variety of food-related and biological systems, protecting those systems from oxidative change.
N. E. Gislason, B. Currie, A. Waterhouse
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The Dimerization of Cinnamic Acid Derivatives
ChemInform, 2003AbstractFor Abstract see ChemInform Abstract in Full Text.
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A comparative vibrational and NMR study of cis-cinnamic acid polymorphs and trans-cinnamic acid
Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, 2001The IR and Raman spectra of the two polymorphic forms (58 degree- and 68 degree-forms) of cis-cinnamic acid were measured, and the spectral differences discussed on the basis of the crystal structures of the two forms. The IR bands related to the COOH group differ in the frequencies and band shape, reflecting differences in the hydrogen bonding between
Kazuhiko Hanai +4 more
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