Results 11 to 20 of about 2,369 (185)

Simple grinding-induced reactions of 2-aminobenzyl alcohol and benzaldehyde derivatives, a rapid synthetic route to 3,1-benzoxazines

Bulletin of the Chemical Society of Ethiopia, 2014
The grinding-induced reactions of 2-aminobenzyl alcohol and benzaldehyde derivatives in the presence of 30 mol% of acetic acid to give 3,1-benzoxazines are described.
I. B. Masesane, E. Muriithi, T. H. Tabane   +2 more
doaj   +1 more source

Intermolecular hydrogen bonding effects on the reaction of dianisidine, bisphenol A (BPA) and formaldehyde

Results in Chemistry, 2023
The synthesis of benzoxazines is a fundamental step in obtaining polybenzoxazine resins, understanding its formation mechanism is important to improve the properties of these resins.
Alejandro Martínez-Manjarres, Rodolfo Quevedo   +1 more
doaj   +1 more source

(Z)-4-(Carbomethoxymethylene)-2-(4-fluorophenyl)-4H-benzo[d][1,3]oxazine

Molbank, 2017
The title compound, (Z)-4-(carbomethoxymethylene)-2-(4-fluorophenyl)-4H-benzo[d][1,3]oxazine, was synthesized in 68% isolated yield by palladium-catalyzed oxidative cyclization-methoxycarbonylation of 4-fluoro-N-(2-((trimethylsilyl)ethynyl)phenyl ...
Francesco Pancrazzi, Elena Motti, Mirco Costa, Raffaella Mancuso, Bartolo Gabriele, Nicola Della Ca’   +5 more
doaj   +1 more source

Synthesis and Characterization of Novel Cardanol Based Benzoxazines

Natural Product Communications, 2009
Benzoxazines are a class of phenolic compounds extensively studied in polymer science because of their properties as fiber reinforcements, fire-retardants and curing agents. In this article is described a solvent-less process, based on a Mannich reaction
Andrea Minigher, Elena Benedetti, Ornela De Giacomo, Pietro Campaner, Vincent Aroulmoji   +4 more
doaj   +1 more source

Crystal structure of 1,2-bis(6-bromo-3,4-dihydro-2H-benz[e][1,3]oxazin-3-yl)ethane: a bromine-containing bis-benzoxazine

Acta Crystallographica Section E: Crystallographic Communications, 2016
The title benzoxazine molecule, C18H18Br2N2O2, was prepared by a Mannich-type reaction of 4-bromophenol with ethane-1,2-diamine and formaldehyde. The title compound crystallizes in the monoclinic space group C2/c with a centre of inversion located at the
Augusto Rivera, Jicli José' Rojas, Jaime Ríos-Motta, Michael Bolte   +3 more
doaj   +1 more source

C—I...N short contacts as tools for the construction of the crystal packing in the crystal structure of 3,3′-(ethane-1,2-diyl)bis(6-iodo-3,4-dihydro-2H-1,3-benzoxazine)

Acta Crystallographica Section E: Crystallographic Communications, 2017
The asymmetric unit of the title compound, C18H18I2N2O2, consists of one half-molecule, completed by the application of inversion symmetry. The molecule adopts the typical structure for this class of bis-benxozazines, characterized by an anti orientation
Augusto Rivera, Jicli José Rojas, Jaime Ríos-Motta, Michael Bolte   +3 more
doaj   +1 more source

Crystal structure of 2,2′-(ethane-1,2-diyl)bis(2,3-dihydro-1H-naphtho[1,2-e][1,3]oxazine): a prospective raw material for polybenzoxazines

Acta Crystallographica Section E: Crystallographic Communications, 2017
In the title compound, C26H24N2O2, the oxazine moiety is fused to a naphthalene ring system. The asymmetric unit consists of one half of the molecule, which lies about an inversion centre.
Augusto Rivera, Juan E. Cepeda-Santamaría, Jaime Ríos-Motta, Michael Bolte   +3 more
doaj   +1 more source

Main-Chain Benzoxazines Containing an Erythritol Acetal Structure: Thermal and Degradation Properties

Molecules, 2023
In this paper, the bio-based raw material erythritol was used to introduce an acetal structure into the benzoxazine resins. The benzoxazine-based resins containing an erythritol acetal structure could be degraded in an acidic solution and were ...
Huili Yang, Yanqin Du, Guangshe Zhang, Ling Han, Longgui Zhang, Riwei Xu   +5 more
doaj   +1 more source

High Temperature Composites From Renewable Resources: A Perspective on Current Technological Challenges for the Manufacturing of Non-Oil Based High Char Yield Matrices and Carbon Fibers

Frontiers in Materials, 2022
During last decades a plethora of high temperature materials have been developed to work as a Thermal Protection System (TPS). Carbon based materials such as graphite, which possesses low density, high heat capacity and high energy of vaporization, have ...
Maurizio Natali, Marco Rallini, Luigi Torre, Debora Puglia   +3 more
doaj   +1 more source

Catalyst selection and optimization of curing process for benzoxazine binders

Учёные записки Казанского университета: Серия Естественные науки
The process of benzoxazine resin curing in the presence of various catalysts was investigated. The catalytic activities were compared to identify the catalyst that most effectively reduced the benzoxazine curing temperature.
V. S. Nikitin, L. M. Amirova, K. A. Andrianova, R. R. Amirov   +3 more
doaj   +1 more source