1791-26-0Relevant articles and documents
Living Anionic Polymerization of N-(1-Adamantyl)-N-4-vinylbenzylideneamine and N-(2-Adamantyl)-N-4-vinylbenzylideneamine: Effects of Adamantyl Groups on Polymerization Behaviors and Thermal Properties
Kang, Beom-Goo,Shoji, Hideo,Kataoka, Hiroshi,Kurashima, Reo,Lee, Jae-Suk,Ishizone, Takashi
, p. 8489 - 8496 (2015)
The anionic polymerization of N-(1-adamantyl)-N-4-vinylbenzylideneamine (1) and N-(2-adamantyl)-N-4-vinylbenzylideneamine (2) was performed using various initiators, such as oligo(α-methylstyryl)dipotassium, potassium naphthalenide, diphenylmethylpotassium, and diphenylmethyllithium, in THF at -78°C for 1 h to investigate the effects of adamantyl groups on the polymerization behaviors and thermal properties of the resulting polymers. The well-defined poly(1) and poly(2) with predictable molecular weights and narrow molecular weight distributions were successfully obtained, indicating that the bulky adamantyl groups effectively protected the carbon-nitrogen double bond (Ci=N) from the nucleophilic attack of the initiators and the propagating chain ends. The stability of the propagating chain end of poly(1) was confirmed by the quantitative efficiencies in the postpolymerization and the sequential copolymerization with tert-butyl methacrylate. A poly(4-formylstyrene) was quantitatively formed by the acidic hydrolysis reaction of the N-adamantylimino groups of the poly(1). The resulting poly(1) and poly(2) showed significantly high glass transition temperatures (Tg) at 257 and 209°C, respectively, due to the bulky and stiff adamantyl substituents. It was also found that the substituted position of adamantane unit and the linkage between polystyrene backbone and adamantyl groups played very important roles to determine the Tg values of the substituted polystyrenes.
Antibiotic protected silver nanoparticles for microbicidal cotton
Montagut, Ana Maria,Granados, Albert,Ballesteros, Anna,Pleixats, Roser,Llagostera, Montserrat,Cortés, Pilar,Sebastián, Rosa María,Vallribera, Adelina
, p. 102 - 108 (2019)
Surface coating of metal nanoparticles is one of the major aspects to be optimized in the design of antimicrobial nanoparticles. The novelty of this work is that antimicrobial derivatives have been used as stabilizers to protect silver nanoparticles (Ag NPs). Microbicidal activity studies of fabricated cotton textiles coated with these Ag@Antibio were performed. Protective ligand layers of Ag NPs resulted to be a deterministic factor in their antimicrobial activity. The best bactericidal activity was obtained for Fabric TAM (coated with Ag NPs with triarylmethane derivates in surface, Ag@TAMSH), with a bacterial decrease of 3 log units for the S. aureus strain. Intrinsic antibiotic activity and partial positive charge of the TAMSH probably enhanced their antimicrobial effects. Fabric Eu (coated with Ag NPs with eugenol derivates in surface, Ag@EugenolSH) and Fabric FQPEG (coated with Ag NPs embedded in PEG-fluoroquinolone derivatives in surface, Ag@FQPEG) displayed antibacterial activity for both Staphylococcus aureus and Pseudomonas aeruginosa strains. These coated antimicrobial cotton fabrics can be applied in different medical textiles.
Vinyl Thianthrenium Tetrafluoroborate: A Practical and Versatile Vinylating Reagent Made from Ethylene
Juliá, Fabio,Paulus, Fritz,Ritter, Tobias,Yan, Jiyao
supporting information, p. 12992 - 12998 (2021/09/03)
The use of vinyl electrophiles in synthesis has been hampered by the lack of access to a suitable reagent that is practical and of appropriate reactivity. In this work we introduce a vinyl thianthrenium salt as an effective vinylating reagent. The bench-stable, crystalline reagent can be readily prepared from ethylene gas at atmospheric pressure in one step and is broadly useful in the annulation chemistry of (hetero)cycles, N-vinylation of heterocyclic compounds, and palladium-catalyzed cross-coupling reactions. The structural features of the thianthrene core enable a distinct synthesis and reactivity profile, unprecedented for other vinyl sulfonium derivatives.
Double-center porous polymer and preparation method thereof
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Paragraph 0025; 0032-0033, (2021/11/21)
The invention belongs to the technical field of catalysts, and particularly relates to a double-center porous polymer, a preparation method thereof, a porphyrin and 4 - (diphenylphosphino) styrene monomer which are functionalized by vinyl, and are prepared by quaternary phosphonium and metal coordination. The invention solves the defect that an existing porous catalyst structure is not easy to regulate and control, utilizes metalloporphyrin and quaternary phosphonium sites as an active center and is fixed in a porous polymer to form a double-center heterogeneous porous catalyst.
