- 1,3-dipolar compound bearing an imidazole functional group
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In a 1,3-dipolar compound of formula Q-A-B, Q comprises a dipole containing at least and preferably one nitrogen atom, A, which is preferably divalent, is an atom or a group of atoms connecting Q to B, and B comprises an imidazole ring. An unsaturated polymer modified by grafting the 1,3-dipolar compound is also disclosed.
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Page/Page column 21-22
(2019/02/20)
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- ORGANIC NANOFIBER STRUCTURE BASED ON SELF-ASSEMBLED ORGANOGEL, ORGANIC NANOFIBER TRANSISTOR USING THE SAME, AND METHOD OF MANUFACTURING THE ORGANIC NANOFIBER TRANSISTOR
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An organic nanofiber including a gelled organic semiconductor compound. Also disclosed is an organic semiconductor transistor and a method of manufacturing an organic semiconductor transistor.
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Paragraph 0083
(2013/03/28)
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- Large-scale preparation of polyfunctional benzylic zinc reagents by direct insertion of zinc dust into benzylic chlorides in the presence of lithium chloride
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Highly functionalized benzylic zinc chlorides are prepared by the direct insertion of commercially available zinc dust into the corresponding benzylic chlorides in the presence of stoichiometric amount of lithium chloride. These polyfunctional zinc organometallics react with various electrophiles leading to a broad range of functionalized products. Georg Thieme Verlag Stuttgart.
- Metzger, Albrecht,Argyo, Christian,Knochel, Paul
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experimental part
p. 882 - 891
(2010/10/01)
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- High-performance organic semiconductors for thin-film transistors based on 2,7-divinyl[1]benzothieno[3,2-b]benzothiophene
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We have synthesized two novel organic semiconductors, which have a symmetrically substituted 2,7-divinyl[1]benzothieno[3,2-b]benzothiophene backbone. They show good electrical performances on a SiO2/Si substrate, with high field-effect mobiliti
- Um, Myoung-Chul,Kwak, Jeonghun,Hong, Jung-Pyo,Kang, Jihoon,Yoon, Do Yeung,Lee, Seong Hoon,Lee, Changhee,Hong, Jong-In
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scheme or table
p. 4698 - 4703
(2010/03/24)
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- Indium-catalyzed direct chlorination of alcohols using chlorodimethylsilane-benzil as a selective and mild system
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The InCl3-catalyzed reaction of alcohols with chlorodimethylsilane (HSiMe2Cl) in the presence of benzil gave the corresponding organic chlorides under mild conditions. Benzil significantly changes the reaction course because the reducing product through dehydroxyhydration was obtained in the absence of benzil. The secondary or tertiary alcohols were effectively chlorinated. The substrates bearing acid-sensitive functional groups were also applied to this system. The highly selective chlorination of the tertiary site was observed in the competitive reaction between tertiary and primary alcohols. The highly coordinated hydrosilane generated from benzil and HSiMe2Cl is an important intermediate. Copyright
- Yasuda, Makoto,Yamasaki, Satoshi,Onishi, Yoshiyuki,Baba, Akio
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p. 7186 - 7187
(2007/10/03)
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- Kinetics of the reaction of sodium arylthiolates with nitro-carboxybenzyl halide derivatives
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The rate constants for the reactions of 4-halomethyl-3-nitrobenzoic acids, the nonnitro derivatives, and their ethyl esters with arylthiolates were measured at different temperatures. It was found that the retardation in rate constants compared to benzyl halides is due to the electrostatic repulsion between the electronegative substituents (COO- and/or NO2) in the substrates and thiolate ions Good correlations between log K2 values of the acids and carbon basicities of thiolates were found while log k2 values of the esters show good straight lines with Hammett a constants, pKa. and carbon basicities of arylthiolates.
- Hamed, Ezzat A.,El-Bardan, Ali A.,El-Mallah, Nabila M.
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p. 283 - 289
(2007/10/03)
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- ALKALINE C-S BOND CLEAVAGE OF SOME ARYLTHIOMETHYL BENZOATES
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Methyl and ethyl--3-nitrobenzoates and the corresponding non-nitro derivatives have been synthesized and their structures proven.The action of 5percent sodium hydroxide solution on these esters gave the corresponding diaryl disulfides besides 3-nitro-4-methylbenzoic acid or 4-methylbenzoic acid. Key words: Arylthiomethyl benzoates; C-S bond fission and mass spectra.
- El-Zahraa Fatma,El-Hegazy, M.,El-Bardan, Ali A.,Hamed, Ezzat A.
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p. 113 - 122
(2007/10/02)
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- Synthesis and Properties of Diethyl 5,10-Dihetera-5,10-dihydroindenoindene-2,7-dicarboxylates
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A series of six heterocyclic diesters 1b-6b containing all combinations of nitrogen, sulfur, and selenium has been prepared from a common precursor, diethyl 2,2'-dinitrostilbene-4,4'-dicarboxylate.Electrochemical analysis showed oxidation potential increases in the order NA liquid crystals.A new synthetic method leading to the indoloindazole ring system has been found.
- Kaszynski, Piotr,Dougherty, Dennis A.
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p. 5209 - 5220
(2007/10/02)
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- Synthesis, biological evaluation and quantitative structure activity relationship analysis of nuclearsubstituted pargylines as competitive inhibitors of MAO-A and MAO-B
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A series of nuclear substituted derivatives of pargyline has been prepared and tested (under controlled conditions designed to measure the competitive component of the inhibition) as competitive inhibitors of MAO-A and -B. Adequate correlation of the biological data with the physicochemical constants of substituent groups was obtained only when the m- and p-substituted derivatives were considered separately. Due to the narrow range of activity displayed by the p-substituted derivates when inhibiting MAO-B, meaningful correlations were not found. However, the inhibition of MAO-B by the m-substituted derivatives required the inclusion of the Verloop L parameter for adequate correlation suggesting that the inhibitor binding site of MAO-B is present within a cavity of more limited lateral dimensions than that present on the MAO-A surface. Inhibition of both MAO-A and -B demonstrated a parabolic relationship between inhibitory activity and Π. Whereas this parabolic relationship showed a maximal value for inhibition of MAO-A (mean Π0 = 0.86), inhibition of MAO-B demonstrated a minimal value of Π(Π(min) = -0.5)i.e.the optimal value of Π for inhibition of MAO-B has not been achieved for this series of compounds but such would be greater than that demonstrated for MAO-A. The Hammett σ function was important or significant only in the inhibition of MAO-A by the p-substituted derivatives.
- Ali,Robinson
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p. 750 - 757
(2007/10/02)
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- Polar Radicals. 14. On the Mechanism of Trialkylstannane Reductions. Positive ρ Values for the Tri-n-butylstannane Reduction of Benzyl Halides. A Correlation with ?-
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The relative reactivities towards reduction by tri-n-butylstannane of a series of substituted benzyl halides have been determined.The order of reactivity was shown to be I > Br > Cl, the same as that reported for alkyl halide reductions.Under the reaction conditions (90 deg C, benzene as solvent, benzoyl peroxide initiation), both aralkyl and alkyl fluorides were shown to be completely unreactive.Activation energies were estimated for the direct abstraction of halogen by tri-n-butyl radicals, and on the basis of these estimates all of the halogens would be predicted to readily undergo abstraction.To explain the non-reactivity of the fluorides several other mechanisms were considered: reversible tin radical addition to the halogen to form an intermediate with an expanded octet, and a free radical chain mechanism involving an electron-transfer reaction between the trialkyltin radical and the benzyl halide. The benzyl halide reductions showed excellent Hammett correlations with positive ρ values; all of these correlations were obtained using ?- substituent constants.The demonstration (the first ever reported) that ?- substituent constants correlate with the relative reactivities for reduction infers that bond breaking takes place in the transition state for the reaction.The magnitudes of the ρ values were not found, as were expected, to be in the inverse order of the relative reactivities: ρ for the iodides (+0.81), for the bromides (+0.17), and for the chlorides (+0.34).To explain the anomalously high value of ρ found for the iodide reduction, it was suggested that the benzyl iodides underwent reduction by a different mechanism than the chlorides and the bromides.The relative rates of reduction of the benzyl iodides in a more polar solvent than benzene, acetonitrile, showed decreased sensitivity to substituents, whereas the reduction of the bromides and chlorides was relatively insensitive to solvent effects.
- Blackburn, Edward V.,Tanner, Dennis D.
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p. 692 - 697
(2007/10/02)
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