85342-65-0Relevant articles and documents
Petroleum-dispersing and antimicrobial activity of newly synthesized polymeric surfactants tethering tetrachlorophthalimide moiety
Mohamed, Hany I.,Basyouni, Mahmoud Z.,Khalil, Ahmed A.,Hebash, Kaouser A.,Tantawy, Ahmed H.
, p. 265 - 274 (2021)
The development of compounds with dual or multi-functions or activities is being paid attention in the scientific community. Herein, two series of phthalimide-containing copolymers were synthesized and structurally characterized and their potency against selected microbial strains was evaluated. Our study mainly focused on evaluating both the antimicrobial and surface activities of new corresponding polymeric cationic surfactants for removing petroleum thin films with their increased dispersing capacity. The synthesis process includes the formation of N-methacryloyloxytetrachlorophthalimide monomer, homopolymerization, and exchange reactions with various amino- and hydroxy-compounds for the synthesis of copolymers. Lastly, polymeric surfactants were obtained via the quaternization of some copolymers with dimethyl sulfate. Among the tested derivatives, compounds 5a, 5b, 6c, 6d, and 7b showed higher activities than the standard drugs which reached 2.45-fold (44?mm against A. niger) in copolymer 5b. Besides, the three polymeric surfactants displayed strong surface activity features including Krafft point, foaming, and emulsifying power. Moreover, polymeric surfactant 7b exhibited strong dispersion behavior for petroleum in both undiluted form (Kd from 91.60 to 93.20%, τ = 30–96?h) and diluted form (Kd from 95.7 to 98.1%, τ = 5–96?h).
Photochemical Organocatalytic Benzylation of Allylic C–H Bonds
Le Saux, Emilien,Melchiorre, Paolo,Zanini, Margherita
supporting information, p. 1113 - 1118 (2022/02/05)
We report a radical-based organocatalytic method for the direct benzylation of allylic C–H bonds. The process uses nonfunctionalized allylic substrates and readily available benzyl radical precursors and is driven by visible light. Crucial was the identification of a dithiophosphoric acid that performs two distinct catalytic roles, sequentially acting as a catalytic donor for the formation of photoactive electron donor–acceptor (EDA) complexes and then as a hydrogen atom abstractor. By mastering these orthogonal radical generation paths, the organic catalyst enables the formation of benzylic and allylic radicals, respectively, to then govern their selective coupling. The protocol was also used to design a three-component radical process, which increased the synthetic potential of the chemistry.
Kinetics of N-oxyl Radicals' Decay
Hordieieva, Iryna,Kompanets, Mykhailo,Kushch, Olga,Litvinov, Yurii,Novikova, Katerina,Opeida, Iosip,Shendrik, Alexander
, p. 7112 - 7124 (2020/07/07)
N-oxyl radicals of various structures were generated by oxidation of corresponding N-hydroxy compounds with iodobenzene diacetate, [bis(trifluoroacetoxy)]iodobenzene, and ammonium cerium(IV) nitrate in acetonitrile. The decay rate of N-oxyl radicals follows first-order kinetics and depends on the structure of N-oxyl radicals, reaction conditions, and the nature of the solvent and oxidant. The values of the self-decay constants change within 1.4 × 10-4 s-1 for the 3,4,5,6-tetraphenylphthalimide-N-oxyl radical to 1.4 × 10-2 s-1 for the 1-benzotriazole-N-oxyl radical. It was shown that the rate constants of the phthalimide-N-oxyl radicalsê? self-decay with different electron-withdrawing or-donor substituents in the benzene ring are higher than that of the unsubstituted phthalimide-N-oxyl radical in most cases. The solvent effect on the process of phthalimide-N-oxyl radical self-decomposition was investigated. The dependence of the rate constants on the Gutmann donor numbers was shown.
