716-39-2Relevant articles and documents
Studies on the synthesis of novel chiral naphthylene bisoxazoline ligands
Wang, Zhan-Yue,Du, Da-Ming,Wu, Di,Hua, Wen-Ting
, p. 1275 - 1283 (2003)
The synthesis of chiral C2-symmetric substituted bisoxazoline ligands containing naphthalene group were investigated. Ethyl 2,3-naphthylene-dicarboxylate reacted with amino alcohols and the resulting amides were treated with SOCl2 and then reacted with Et3N in toluene to afford the desired bisoxazolines. 2,3-Naphthylenedicarbonitrile reacted with amino alcohol give N-(1′-phenyl-2′-hydroxyethyl)-2,3naphthylenedicarboximide 1. The 2,3-naphthylenedicarboxylic acid reacted with thionyl chloride give the 2,3-Naphthalenedicarboxylic acid cyclic anhydride rather than corresponding 2,3-naphthalenedicarboxylic acid dichloride, the former reacted with amino alcohol also give compound 1. The later two strategies cannot give the target bisoxazoline.
Picomole scale stereochemical analysis of sphingosines and dihydrosphingosines
Kawamura, Akira,Berova, Nina,Dirsch, Verena,Mangoni, Alfonso,Nakanishi, Koji,Schwartz, Gary,Bielawska, Alicja,Hannun, Yusuf,Kitagawa, Isao
, p. 1035 - 1043 (1996)
We have developed a simple picomole (low nanogram) scale HPLC scheme which can separate all eight isomers of sphingosine and dihydrosphingosine thus leading to the identification of their relative and absolute configurations. The amino group of the sample is derivatized to its fluorescent N-naphthimide which is analyzed by normal and chiral phase HPLC, coupled with fluorescence peak detection. If necessary, the results of this HPLC method can be further corroborated by measurements of circular dichroic (CD) spectra of the N-naphthimido-derivatives and/or N,O-chromophoric derivatives.
TBHP/ n -Bu 4 PBr-Promoted Oxidative Cross-Dehydrogenative Coupling of Aryl Methanols: A Facile Synthesis of Symmetrical Carboxylic Anhydride Derivatives
Adib, Mehdi,Pashazadeh, Rahim
supporting information, p. 136 - 140 (2017/12/27)
A transition-metal-free oxidative cross-dehydrogenative coupling reaction has been developed for the preparation of symmetrical carboxylic anhydrides through self-coupling dual C-O bond formations of aryl methanols. In the presence of a catalytic amount of tetrabutylphosphonium bromide (TBPB) as transfer agent and aqueous tert -butyl hydroperoxide (TBHP) as oxidant and reactant, methylene groups of aryl methanols were efficiently oxidized to C=O and coupled with the peroxide oxygen from TBHP to form a diverse array of symmetrical carboxylic anhydride derivatives.
Heptacene: Characterization in Solution, in the Solid State, and in Films
Einholz, Ralf,Fang, Treliant,Berger, Robert,Grüninger, Peter,Früh, Andreas,Chassé, Thomas,Fink, Reinhold F.,Bettinger, Holger F.
supporting information, p. 4435 - 4442 (2017/04/03)
Acenes comprise an important class of organic semiconducting materials. As graphene nanoribbons of ultimate width, they are valuable atom-precise model systems for studying the properties of this form of nanoscale carbon materials. Heptacene is the smallest member of the acene series that could only be studied under matrix isolation conditions. Its existence in bulk had never been positively confirmed, despite efforts dating back more than 70 years. We report that the reduction of 7,16-heptacenequinone produces a mixture of two diheptacene molecules. The diheptacenes undergo thermal cleavage to heptacene at high temperatures in the solid state. Monitoring this cycloreversion by solid state 13C cross-polarized magic angle spinning NMR reveals that solid heptacene has a half-life time of several weeks at room temperature. The diheptacenes are valuable precursors for generating films of heptacene by vapor phase deposition that can be studied below or at room temperature.
Preparation method of 2,3-naphthalic acid
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Paragraph 0055; 0062, (2017/07/23)
The invention discloses a preparation method of 2,3-naphthalic acid, belonging to the technical field of preparation of organic compounds used as medical and liquid crystal intermediates. According to the preparation method, o-phthalaldehyde is used as a raw material, and through performing acetalation reaction, reducing reaction, hydrolysis reaction, cycloaddition reaction, dehydration reaction and hydrolysis reaction in sequence, finally the 2,3-naphthalic acid is prepared. The preparation method optimizes the reaction steps and conditions and has the advantages of reasonable synthetic route, high purity and yield of product, low production cost, low pollution, easy industrialization and the like.
METHOD FOR PRODUCING CARBOXYLIC ACID ANHYDRIDE, METHOD FOR PRODUCING CARBOXYLIC IMIDE, AND METHOD FOR MANUFACTURING ELECTROPHOTOGRAPHIC PHOTOSENSITIVE MEMBER
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Paragraph 0122, (2017/01/19)
A method for producing a carboxylic acid anhydride includes heating a composition containing a specific compound in a solvent to yield the carboxylic acid anhydride. The solvent is an aprotic polar solvent having a boiling point of 50° C. or more.
Facile Sc(OTf)3-catalyzed generation and successive aromatization of isobenzofuran from o -dicarbonylbenzenes
Nishina, Yuta,Kida, Tatsuya,Ureshino, Tomonari
supporting information; experimental part, p. 3960 - 3963 (2011/10/01)
Isobenzofuran can be prepared from o-phthalaldehyde using hydrosilane. The formed isobenzofuran is trapped by an alkene via a Diels-Alder reaction. Further dehydration proceeds to furnish the conjugated aromatic compound. This multistep reaction was promoted by catalytic amounts of Sc(OTf)3.
New efficient route to fused aryltetrahydroindolizinones via N-Acyliminium intermediates
Chiurato, Matteo,Routier, Sylvain,Troin, Yves,Guillaumet, Gerald
scheme or table, p. 3011 - 3021 (2009/11/30)
Straightforward routes to fused tetrahydroindolizinones by two routes A and B, starting either from. 2-formylbenzoic acid and esters or from, β-hydroxy lactones via acyl iminium ions, are described. A plausible mechanism and limitations are given. Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2009.
Discovering a new analogue of thalidomide which may be used as a potent modulator of TNF-α production
Brana, Miguel Fernandez,Acero, Nuria,Anorbe, Loreto,Mingarro, Dolores Munoz,Llinares, Francisco,Dominguez, Gema
body text, p. 3533 - 3542 (2009/12/04)
A new series of imide derivatives related to thalidomide were synthesized and evaluated as modulators of TNF-α production. These derivatives enhance TNF-α production using human leukemia HL-60 cells induced with 12-O-tetradecanoylphorbol 13-acetate (TPA), while inhibiting TNF-α production induced with okadaic acid (OA) in the same cell line. The diphenylmaleimide derivative 2f, was found to be the most active product, producing a strong modulation of the cytokine level.
Synthesis and photophysical properties of dihydroheptacenes: New blue-emitting materials
Mondal, Rajib,Shah, Bipin K.,Neckers, Douglas C.
, p. 4085 - 4091 (2007/10/03)
7,16-Dihydroheptacenes (1-3) substituted at the 6, 8, 15, and 17 positions are synthesized as blue emitters potentially useful in organic light emitting diodes (OLEDs). The photophysical properties of 1-3 (λmax = 424-428 nm, ΦF = 0.15-0.21, τF = 2.35-2.67 ns in CH2Cl2) are discussed. They are shown to be stable and efficient blue emitters in the solid state (ΦF = 0.37-0.44). The X-ray crystal structure of 1 is reported.
