Showing papers on "Derivative (chemistry) published in 2009"
22 Mar 2009
648 citations
TL;DR: The dialkynylated tetraazapentacene was prepared by a two-step synthesis from the corresponding quinone derivative and is of great interest as a potential organic n-electron-transport material.
Abstract: A new relative of pentacene: The dialkynylated tetraazapentacene (see figure) was prepared by a two-step synthesis from the corresponding quinone derivative. The heteroacene is an air-stable, dark-blue, crystalline material and is of great interest as a potential organic n-electron-transport material.
176 citations
TL;DR: In this article, the authors reviewed the instrumental development and analytical applications of derivative UV-vis regions absorption spectrophotometry produced in the last 5 years (since 2004) are reviewed.
173 citations
TL;DR: A new coumarin derivative is shown to be a highly effective turn-on fluorescent sensor that is catalytically hydrolyzed by Cu2+, and the catalytic process induces a large increase in the fluorescence intensity, due to amplification of the fluorescent signal.
173 citations
173 citations
TL;DR: An amide-appended corannulene derivative with tribranched paraffinic side chains self-assembles into a hexagonal columnar liquid crystalline (LC) mesophase that responds to an applied electric field and can align homeotropically to the electrode surface.
Abstract: An amide-appended corannulene derivative (3) with tribranched paraffinic side chains self-assembles into a hexagonal columnar liquid crystalline (LC) mesophase over a wide temperature range from 15...
166 citations
TL;DR: Recent advances based on the use of molecular modeling have broadened the applicability of the tweezer methodology and allowed extraction of deeper structural information contained in the experimental CD data, which is diagnostic of the guest's absolute configuration.
152 citations
TL;DR: A spiropyran derivative behaves as a selective and sensitive cyanide anion receptor in aqueous media under UV irradiation and can be reproduced just by irradiation with visible light.
139 citations
Patent•
19 Mar 2009
TL;DR: In this paper, the problem of providing an aromatic amine derivative for producing an organic electroluminescent element having high light-emitting efficiency and long life was addressed.
Abstract: PROBLEM TO BE SOLVED: To provide an aromatic amine derivative for producing an organic electroluminescent element having high light-emitting efficiency and long life, and to provide the organic electroluminescent element using the derivative SOLUTION: The aromatic amine derivative is represented by general formula (1): (A)n-N-(B)m (wherein, A is a benzene ring substituted with 1-20C linear, branched or cyclic alkyl, 1-20C alkoxy or aryl having 6-30 nuclear carbons; B is an aromatic ring or a condensed polycyclic aromatic ring; n is 1 or 2; m is 1 or 2; with the proviso that n+m=3) The aromatic amine derivative represented by formula (1) is used as the organic electroluminescent element COPYRIGHT: (C)2011,JPO&INPIT
136 citations
Patent•
30 Jun 2009
TL;DR: In this paper, an amide derivative having excellent pest control effect, which is represented by general formula (1), is described, where A represents a carbon atom, a nitrogen atom or the like; K represents a non-metal atomic group necessary for forming a cyclic linking group derived from benzene or a heterocyclic ring; X represents a halogen atom or a like; n represents an integer of 0-4.
Abstract: Disclosed is an amide derivative having excellent pest control effect, which is represented by general formula (1). In general formula (1), A represents a carbon atom, a nitrogen atom or the like; K represents a non-metal atomic group necessary for forming a cyclic linking group derived from benzene or a heterocyclic ring; X represents a halogen atom or the like; n represents an integer of 0-4; R1 and R2 each represents a hydrogen atom, an alkyl group or the like; T represents -C(=G1)-Q1 or -C(=G1)-G2Q2; G1-G3 each represents an oxygen atom or the like; Q1 and Q2 each represents a hydrogen atom, an alkyl group, an aryl group or the like; Y1 and Y5 each represents a halogen atom or the like; Y2 and Y4 each represents a hydrogen atom or the like; and Y3 represents a C2-C5 haloalkyl group.
92 citations
TL;DR: In this paper, a binaphthyl derivative possessing two 2,3-difluoro-1,4-diphenylbenzene units was prepared and the phase transition behavior was investigated.
Abstract: We prepared a binaphthyl derivative possessing two 2,3-difluoro-1,4-diphenylbenzene units, and then investigated the phase transition behaviour. On cooling, the compound was found to exhibit a phase sequence of iso liq–blue phase–smectic phase. The temperature of the blue phase with a cubic structure was about 30 K. An electric-field-induced phase transition was observed in the blue phase. On heating, the compound exhibited marked phase separation. Some regions showed a phase sequence of cryst–chiral nematic (N*)–blue phase (BP)–iso liq, whereas others showed that of cryst–iso liq. The temperature range of coexisting crystal and iso liq phases was about 29 K. The phase separation is quite unusual for a single compound. The phase-transition behaviour is discussed in terms of the molecular shape of the binaphthyl derivative.
TL;DR: The gallium(I) derivative [Ga({N(dipp)CMe}(2)CH)] (1; dipp = 2,6-diisopropylphenyl) undergoes facile oxidative addition reactions with various element-hydrogen bonds including N-H, P-H and Sn-H bonds.
Abstract: The gallium(I) derivative [Ga({N(dipp)CMe}(2)CH)] (1; dipp = 2,6-diisopropylphenyl) undergoes facile oxidative addition reactions with various element-hydrogen bonds including N-H, P-H, O-H, Sn-H, and H-H bonds. This was demonstrated by its reaction with triphenyltin hydride, ethanol, water, diethylamine, diphenylphosphane, and dihydrogen. All products were characterized by means of single-crystal X-ray structure determination, NMR spectroscopy, IR spectroscopy, and mass spectrometry.
TL;DR: Nanocoils and straight nanoribbons have been controllably fabricated through the interfacial organization of an anthracene derivative and display a switchable photocurrent upon an on/off illumination.
Abstract: Nanocoils and straight nanoribbons have been controllably fabricated through the interfacial organization of an anthracene derivative. A morphology-dependent photoswitching has been observed. While the nanocoils show no photocurrent response, the straight nanoribbons display a switchable photocurrent upon an on/off illumination.
TL;DR: In this article, the X-ray crystal structures of three (E)-1-cinnamoylidene iminium PF6 salts of 5-benzyl-3-methylimidazolidin-4-ones (2,2-dimethyl-, cis-2-(tert-butyl)-, and cis- 2-styryl-substituted; 2-4, resp.) are reported.
Abstract: The X-ray crystal structures of three (E)-1-cinnamoylidene iminium PF6 salts of 5-benzyl-3-methylimidazolidin-4-ones (2,2-dimethyl-, cis-2-(tert-butyl)-, and cis-2-styryl-substituted; 2-4, resp.) are reported (Figs. 3-5). In the 2,2-dimethyl and in the cis-2-styryl derivative, 2 and 4, respectively, a CH bond of the cis-substituent in 2-position points to the center of the benzene ring of the benzyl group above the five-membered ring (Fig. 6, a and b). NMR Measurements (Fig. 8) provide evidence that the same structure is present in solution, and that a fourth derivative of this type, 5 (Scheme), has (Z)- instead of (E)-configuration around the CN bond. In the cis-2-(tert-butyl) derivative 3, the benzyl group is located over the iminium -system (Figs. 4 and 6, c). Overlays with DFT-calculated crotonylidene analogs, A and B, show that the theoretical and experimental structures are almost superimposable (Fig. 9 and Table). The structures are discussed in view of their role as reactive intermediates in organocatalysis and in view of the help synthetic organic chemists may experience from theory.
TL;DR: A chlorophyll a derivative was synthesized and used for dye-sensitized solar cells with a solar energy-to-electricity conversion efficiency of 6.5%.
TL;DR: Thionation and selenation of an acetyl-protected sialic acid derivative are found to take place selectively at the amide group through reduction of elemental sulfur by the hydrochlorosilane in the presence of a suitable amine.
TL;DR: For a class of one-dimensional reaction-diffusion equations, this paper established the existence of generalized fronts, as recently defined by Berestycki and Hamel, and also proved uniform nondegeneracy estimates, such as a lower bound on the time derivative on some level sets.
Abstract: For a class of one-dimensional reaction-diffusion equations, we establish the existence of generalized fronts, as recently defined by Berestycki and Hamel. We also prove
uniform nondegeneracy estimates, such as a lower bound on the time derivative on some level sets, as well as a lower bound on the spatial derivative.
TL;DR: A study of the synthesis of a 4-hydroxyquinoline derivative using the Conrad–Limpach reaction led to the identification of inexpensive and user-friendly solvents for this thermal condensation.
TL;DR: The first "Off-On" type fluorescent probe for Au3+ is reported, in which rhodamine-alkyne derivative displayed highly selective fluorescence enhancement and "naked-eye" detection upon the addition of Au3+, at pH 7.4.
Patent•
05 Feb 2009
TL;DR: In this article, an organic EL material is produced by synthesizing a compound having carbazolyl groups and obtained by using one molecule of a fluorene derivative as a center and bonding each one of a carbazole derivative to the symmetrical positions of the center molecule.
Abstract: PROBLEM TO BE SOLVED: To provide a compound having carbazolyl groups and usable as a material for organic EL elements. SOLUTION: An organic EL material is produced by synthesizing a compound having carbazolyl groups and obtained by using one molecule of a fluorene derivative as a center and bonding each one molecule of a carbazole derivative to the symmetrical positions of the center molecule. The organic EL element produced from a compound having carbazolyl groups among a carbazole derivative-fluorene derivative-carbazole derivative exhibits low-voltage driving performance, long life, etc., and accordingly is usable as a flat light, a liquid crystal display, a displaying plate, a marker light, etc. The molecular weight of the compound having carbazolyl groups is especially preferably ≤1,100 and too high molecular weight of the compound may cause difficulty in the evaporation in the case of producing an element by evaporation coating. COPYRIGHT: (C)2009,JPO&INPIT
TL;DR: Treatment of difluorobenzyldiphenylphosphine with the Ir(III) dimer gives (N,N)-trans-[Ir(dfppy)2(dfbdpH)Cl]2, which is suitable for fabrication of true-blue phosphorescent OLEDs.
Abstract: Treatment of difluorobenzyldiphenylphosphine with the Ir(III) dimer [(dfppy)2Ir(μ-Cl)]2 gives (N,N)-trans-[Ir(dfppy)2(dfbdpH)Cl], followed by skeletal isomerization to form its (N,N)-cis analogue, and then the fully cyclometalated complex [Ir(dfppy)2(dfbdp)]; the last complex and its derivative are suitable for fabrication of true-blue phosphorescent OLEDs.
TL;DR: In this paper, the authors used the anharmonic-downward-distortion-following (ADD-Following) method to find the lowest barrier from the six-membered-ring structure in hexasilabenzene, and computed the barrier height to be only 74 kJ mol−1.
TL;DR: The Friedl nder reaction (FR) is a baseor acid-catalyzed condensation of an aromatic 2-amino-substituted carbonyl compound (aldehyde or ketone) with a carbonyll derivative containing a reactive a-methylene group followed by cyclodehydration as discussed by the authors.
Abstract: The quinoline ring is present in a number of natural and synthetic products often exhibiting interesting pharmacological activities or physical properties. Different synthetic approaches for the preparation of quinolines have been reported; the Friedl nder reaction (FR) being one of the simplest and most efficient methods. FR is a baseor acid-catalyzed condensation of an aromatic 2-amino-substituted carbonyl compound (aldehyde or ketone) with a carbonyl derivative containing a reactive a-methylene group followed by cyclodehydration (Scheme 1). Generally, the annulation takes place
TL;DR: Stable 1,2-bis(metallocenyl) disilenes were synthesized for the first time and were characterized by spectroscopic and X-ray crystallographic analyses.
Abstract: Stable 1,2-bis(metallocenyl)disilenes were synthesized for the first time and were characterized by spectroscopic and X-ray crystallographic analyses. On the basis of cyclic voltammograms, (E)-1,2-bis(ferrocenyl)-1,2-bis(2,4,6-triisopropylphenyl)disilene (1a) was found to be a stable five-electron redox system with four steps, while (E)-1,2-bis(ruthenocenyl)-1,2-bis(2,4,6-triisopropylphenyl)disilene (1b) showed four-step redox couples with four electrons. The UV-vis spectra and theoretical calculations for these disilenes suggested that they should be novel d-π conjugated systems containing a disilene unit. In addition, chalcogenation reactions of 1a resulted in the formation of new heterocyclic compounds bearing ferrocenyl units. For example, the first stable 1,2,3,4-dithiadisiletane derivative was obtained by the sulfurization reaction of 1a.
TL;DR: The constitution of the chiral D(2)-C( 80) fullerene has been confirmed through single-crystal X-ray analysis of the chlorinated C(80)Cl(12) and a stepwise principle of higher fullerenes reactivity is proposed.
Abstract: Welcome to the family! The constitution of the chiral D(2)-C(80) fullerene has been confirmed through single-crystal X-ray analysis of the chlorinated C(80)Cl(12). The addition pattern of the chlorine atoms in the structure of C(80)Cl(12) together with other structures of halogenated higher fullerenes is discussed. A stepwise principle of higher fullerene reactivity is proposed. Unusual short intermolecular chlorine-chlorine contacts are reported.
Patent•
30 Apr 2009
TL;DR: In this paper, an organic electric field light-emitting element (organic EL element) with which the light emission efficiency of the element can be improved, and the driving stability can be fully guaranteed, and which has a simple configuration was disclosed.
Abstract: Disclosed is an organic electric field light-emitting element (organic EL element), with which the light emission efficiency of the element can be improved, and the driving stability can be fully guaranteed, and which has a simple configuration. Also disclosed is a compound for organic EL element used for said element. The compound for organic EL element is, for example, an indolocarbazole derivative represented by general formula (3). The organic EL element is an organic electric field light-emitting element having a light-emitting layer between an anode and a cathode laminated on a substrate, and in which said light-emitting layer contains a phosphorescent light-emitting dopant and said indolocarbazole derivative as host materials. In general formula (3), L is an n+1 valent aromatic heterocyclic group having a condensed ring structure. Ar 1 to Ar 3 are alkyl groups, aralkyl groups, substituted or unsubstituted aromatic hydrocarbon groups or aromatic heterocyclic groups, and n is an integer in the range of 0 to 5. (3)
TL;DR: A short, convenient, gram scale protocol has been established to allow facile access to all four stereoisomers of 2-aminocyclobutanecarboxylic acid, each in enantiomerically pure form, and proceeds with invariably high yields.
Abstract: A short, convenient, gram scale protocol has been established to allow facile access to all four stereoisomers of 2-aminocyclobutanecarboxylic acid, each in enantiomerically pure form (ee >99%). Starting from the readily available cis racemate, the procedure combines efficient α-phenylethylamine derivative resolution and controlled cis-to-trans epimerization procedures, and proceeds with invariably high yields.
TL;DR: A new hydrosoluble triaz atruxene derivative (Azatrux) is reported to selectively bind to G-quadruplex DNA, as derived by ESI-MS measurements and competition experiments.
Abstract: A new hydrosoluble triazatruxene derivative (AZATRUX) is reported to selectively bind to G-quadruplex DNA, as derived by ESI-MS measurements and competition experiments.
TL;DR: The manganese-catalyzed dehydrative annulation reaction of a 1,3-dicarbonyl compound and a terminal alkyne provides an efficient and regioselective synthesis of a substituted benzene derivative, highlighted by the exclusive formation of a p-terphenyl derivative from an aryl acetylene.
Abstract: The manganese-catalyzed dehydrative [2 + 2 + 2] annulation reaction of a 1,3-dicarbonyl compound and a terminal alkyne provides an efficient and regioselective synthesis of a substituted benzene derivative, highlighted by the exclusive formation of a p-terphenyl derivative from an aryl acetylene. The mechanism and the origin of the regioselectivity of the reaction were explored by experiments and density functional theory (DFT) calculations. Experimental data revealed the cis stereochemistry of a cyclohexadienol precursor to the benzene product and suggested that two reaction pathways may operate competitively sequential carbometalation reactions of a manganese enolate and formation of a manganacyclopentadiene intermediate. The DFT study supported the first possibility, namely that the reaction involves three steps: (1) addition of a manganese enolate of a 1,3-dicarbonyl compound to a terminal alkyne to give a vinylmanganese complex, (2) insertion of a second alkyne into the vinyl-Mn bond to give a dienylmanganese complex, and (3) intramolecular nucleophilic addition of the dienylmanganese to the carbonyl group. This mechanism is consistent with the experimental facts such as the perfect regioselectivity of the reaction of an aryl acetylene, the moderate regioselectivity of the reaction of an alkyl acetylene, and the stereochemistry of the annulation product. An alternative mechanism involving a manganacyclopentadiene intermediate failed to account for the experimental regioselectivity, although it may be occurring as a very minor competitive pathway.
TL;DR: An anthracene derivative having forklike side chains shows a change of photoluminescent color from green to light blue at the smectic-smectic phase transition.