4958-10-5Relevant articles and documents
Zeolite-supported one-pot synthesis of bis-azetidinones under microwave irradiation
Jetti, Venkateshwarlu,Pagadala, Ramakanth,Meshram, Jyotsna S.,Chopde, Himani N.,Malladi, Latha
, p. E160-E165 (2013)
In an attempt to synthesize antibacterial agents effective against gram-positive and gram-negative bacteria, the efficient synthesis of novel bis-azetidinones (3a-j) has been established. Thus, cycloaddition reaction of substituted bis-imines with chloroa
Curable Compound, Coating Composition Comprising the Same and Organic Light Emitting Diode Comprising Organic Thin Layer with Superior Solvent Orthogonality Derived therefrom
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, (2021/04/13)
The present invention has excellent solvent resistance. For example, the compound represented by the following Chemical Formula 1 may be used as the organic thin film layer of the multi-layer structure in the solution process. Chemical Formula 1.
COMPOSITIONS OF OLIGOANILINES AND METHODS OF MAKING AND USING
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, (2020/12/14)
Compositions of oligoanilines with higher purity, methods of making and using thereof, are provided. The compositions are produced in large scale with larger yield using simple purification techniques such as washing. Methods have been developed that allow large scale synthesis of oligoaniline compounds with the following benefits: (i) higher purity; (ii) larger yield of oligoaniline compounds; (iii) simple purification that does not require complicated techniques such as liquid chromatograph; (iv) lower cost; and (v) full characterization. The highly pure oligoaniline compositions can be used as reducing or oxidizing agent in a redox reaction. The oligoaniline compositions have colors and can be used as dyes, i.e. redox active dyes in a redox reaction, as intermediates for the development of conductive elastomers, or as catalysts.
DERIVATIVES OF PPD USEFUL FOR COLORING HAIR AND SKIN
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Page/Page column 30; 31; 32, (2019/06/09)
The is provided a compound of formula I or II or physiologically acceptable salts or solvates, or oxidised derivatives thereof: where R1 to R3, R13 and R14 are as defined herein. Also disclosed herein are methods of dyeing hair or (temporarily) tattooing the skin using the compounds of formula I or II (or physiologically acceptable salts or solvates, or oxidised derivatives thereof) in a suitable composition.
One-pot propagation of (Hetero)Arylamines: Modular synthesis of diverse Amino-di(hetero)arylamines
Liang, Xueting,Xu, Liang,Li, Cuihua,Jia, Xin,Wei, Yu
, p. 721 - 731 (2019/01/08)
Formal propagation of (hetero)arylamine is achieved via a one-pot Buchwald–Hartwig C–N cross-coupling and nitro reduction sequence, enabling a rapid modular synthesis of diverse amino-di(hetero)arylamines from (hetero)arylamines and halogenated nitrobenzenes. Various functionalized aromatic amines with different electronic and steric environments can be efficiently prolongated to formally incorporate another arylamino fragments. This approach has been successfully applied in the synthesis of more than forty amino-di(hetero)arylamines. The applicability of this method has also been demonstrated in the synthesis of oligoanilines and the tyrosine-kinase inhibitor Imatinib.
Facile synthesis of oligo anilines as permanent hair dyes: How chemical modifications impart colour and avoid toxicity
Venkatesan, Gopalakrishnan,Dancik, Yuri,Sinha, Arup,Bigliardi, Mei,Srinivas, Ramasamy,Dawson, Thomas,Valiyaveettil, Suresh,Bigliardi, Paul,Pastorin, Giorgia
, p. 16188 - 16199 (2019/11/03)
Many dyes for long-lasting hair coloring contain aromatic amines that undergo oxidative polymerizations, resulting in allergic contact dermatitis, with the potential to develop serious toxic effects. Among these amines, para-phenylenediamine (PPD) is a small molecule form of aniline commonly used in beauty products despite being a known allergen to humans. Hence, in this study we designed and synthesized safer PPD analogues through the synthesis of oligomeric PPD and the introduction of bulky side chains on PPD to overcome the PPD dye's toxicity. We hypothesized that (a) an increase in the molecular size of PPD by addition of the PPD monomer unit on free amines and (b) strategic functionalizations at the ortho position of PPD with strong electron-donating bulky groups are able to maintain the hair coloring properties, and increase the resistance to binding to skin proteins and therefore decrease the chance of skin sensitization. 13 oligomers were synthesized, with the aim to produce safer hair dyes while minimising eventual toxicity to humans. In particular, oligomers with bulky sidechains, PPD 6 (13), PPD 7 (14) and PPD 8 (15), displayed weak-to-moderate (27.1%, 24.1% and 34.0%) sensitization potential. The results confirmed the importance of having bulky and strong electron donating O-alkyl substituents in order to decrease the reactivity of PPD analogues towards skin proteins, thus preventing the interaction with immune cells and providing safer hair dyes.
Large-Scale Synthesis of Aniline Trimers in Different Oxidation States
Bugarin, Alejandro,Poyil, Anurag Noonikara,Yepez, Gerardo
, p. 3611 - 3616 (2019/09/30)
Polyanilines are an important class of organic compounds, due to their utility in a large variety of applications. In contrast, oligo?-anilines have been employed far more sporadically, in large part reflecting an absence of refined synthetic approaches. Herein, we report, for the first time, a relatively large-scale strategy to generate highly pure aniline trimers at different oxidation states with excellent yields (90-97percent).
Surface modification of a BN/ETDS composite with aniline trimer for high thermal conductivity and excellent mechanical properties
Ryu, Seokgyu,Oh, Taeseob,Kim, Jooheon
, p. 22846 - 22852 (2018/07/05)
Boron nitride (BN) particles surface-treated with different amounts of aniline trimer (AT) were used to prepare thermally conductive polymer composites with epoxy-terminated dimethylsiloxane (ETDS). For the same weight content of BN, the BN composites surface-treated with AT showed better mechanical strength and thermal conductivity than the pure BN composites. This is because of the intercalation of AT between BN and ETDS, which not only increased the wettability but also provided excellent heat transfer pathways. We determined the optimum surface treatment ratio by varying the amount of AT, and the results are discussed regarding the thermal conductivity, storage modulus, and tensile strength. Finally, we established the optimum AT ratio for BN surface treatment.
Synthesis and spectroscopic properties of linear oligoanilines
Rozalska,Kurylek,Franaszek,Kulszewicz-Bajer
, p. 105 - 114 (2007/10/03)
Two types of linear oligomers, namely Ph/NH2 and NH 2/NH2 end-capped oligoanilines have been synthesized by SNAr coupling/reduction sequence. The 1H NMR spectra of obtained compounds are strongly infl
Linear 1,4-coupled oligoanilines of defined length: Preparation and spectroscopic properties
Rozalska, Izabela,Kulyk, Paulina,Kulszewicz-Bajer, Irena
, p. 1235 - 1243 (2007/10/03)
A facile synthetic method involving SNAr coupling of 4-fluoronitrobenzene to arylamines, followed by reduction of the nitro groups, has been developed. The method allows the preparation of symmetric (NH 2/ NH2 end-capped) and asymmetric (Ph/NH2 end-capped) oligoanilines of even or odd chain lengths. The preparation of the NH2/NH2 end-capped trimer to octamer and Ph/NH2 end-capped trimer to pentamer is described. The effect of the chain length on the spectroscopic properties of the oxidized oligomers has been investigated by UV-Vis-NIR spectroscopy.