51287-17-3Relevant articles and documents
Tailor-made and chemically designed synthesis of coumarin-containing benzoxazines and their reactivity study toward their thermosets
Froimowicz, Pablo,Rodriguez Arza, Carlos,Ohashi, Seishi,Ishida, Hatsuo
, p. 1428 - 1435 (2016)
Coumarins are used as a natural renewable resource to synthesize coumarin-containing benzoxazine resins. The coumarin-containing benzoxazines are fully characterized in terms of their chemical structure by Fourier-transform infrared spectroscopy and proto
Benzoxazine miniemulsions stabilized with polymerizable nonionic benzoxazine surfactants
Sawaryn, Christian,Landfester, Katharina,Taden, Andreas
, p. 8933 - 8941 (2010)
For the first time, the concept of polymerizable nonionic benzoxazine surfactants is described. Different target structures with varying hydrophobic-lipophilic balance (HLB) values were synthesized and successfully tested for the miniemulsification of two N-aliphatic and N-aromatic benzoxazine resins. As a model system, the difunctional benzoxazine surfactant bis(3,4-dihydro-2H-3-(polypropyleneoxide-block-polyethyleneoxide-1, 3-benzoxazinyl)isopropane (B2000) was analyzed in detail via FT-IR, 1H NMR, surface tension measurements, and thermal analysis such as DSC and TGA. Additional to the colloidal stability of the benzoxazine miniemulsions, investigations focused on the surfactant copolymerization behavior and compatibility with other resins. It was found that despite the observed slow homopolymerization the described surfactants easily undergo copolymerization with the model benzoxazine resins.
Catalytic performance of benzoxazine derived ordered mesoporous carbon materials for the selective oxidation of 2-methylnaphthalene
Zang, Zhouxuan,Chang, Yingge,Yu, Yi,Zhang, Haihan,Xu, Li,Liu, Guoji
, p. 17422 - 17430 (2020)
2-Methylnaphthoquinone is an important chemical product. The catalyst used in the catalytic oxidation of 2-methylnaphthalene to 2-methylnaphthoquinone has been a research hotspot. In this paper, benzoxazine derived ordered mesoporous carbon materials were used as catalysts, and their catalytic performance in acetic acid/hydrogen peroxides was investigated. The N/S co-doped carbon material (NSCM) was prepared with thiourea-type benzoxazine as a carbon precursor and SBA-15 as a template. The nitrogen-doped carbon material (NCM) was prepared using the same method using aniline-type benzoxazine as a precursor. The carbon materials were characterized by N2 adsorption/desorption, X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS) and Raman spectroscopy. The results have shown that both carbon materials exhibit worm-like structure and have graphitized amorphous structure. Nitrogen in the carbon materials existed in the form of pyridine nitrogen and pyrrole nitrogen, which caused the surface defects of carbon materials. The surface defects are critical for the enhancement of the catalytic activity of carbon materials. With NSCM and NCM as catalysts, the yields of 2-methylnaphthoquinone were 78.8% and 65.7%, respectively. By comparison, NSCM has higher catalytic activity, and the catalytic activity remains stable after five cycles of use. These results indicate that NSCM has great potential as a highly efficient catalyst for the selective oxidation of 2-methylnaphthalene. This journal is
Synthesis of arylidene-based benzoxazine derivatives as promising antimicrobial materials
Al-Ghamdi, Youssef O.,Alamry, Khalid A.,Alzahrani, Abdullah Y.,Elfaky, Mahmoud A.,Hussein, Mahmoud A.,Hussien, Mostafa A.,Musa, Abdulrahman
supporting information, (2021/12/10)
The current study is focused on the synthesis of two novel arylidene-based benzoxazines namely: 3-(3-phenyl-3,4-dihydro-2H-benzo[e][1,3]oxazin-6-yl)-1-(thiophen-2-yl)-2-propenone (PTP), and 3-(3-phenyl-3,4-dihydro-2H-benzo[e][1,3]-oxazin-6-yl)-1-(pyridin-2-yl)-2-propenone (PPP). The benzoxazines were obtained as condensation products of the reaction of each of the phenol analogs: [3-(4-hydroxyphenyl)-1-(2-thiophenyl)-2-propenone] (HTP), and [3-(4-hydroxyphenyl)-1-(2-pyridinyl)-2-propenone] (HPP), with aniline, and paraformaldehyde, respectively. PTP and PPP were structurally confirmed using analysis such as ultraviolet (UV) spectroscopy, together with FTIR, and 1H-NMR and 13C-NMR spectral analyses, respectively. The benzoxazine derivatives revealed an excellent antimicrobial activity against the selected bacterial (including Gram-positive & Gram-negative) and fungi. The antimicrobial activity was also investigated using the agar diffusion approach. The qualitative assay of the biological study from the inhibition zones for the PTP, PPP, and PBO revealed interesting results. The examinations revealed some levels of antimicrobial efficacy against the selected bacterial strains used. However, the biological efficacy of PTP appeared to be better with larger zones of inhibition against the growth of the micro-organisms. Moreover, the molecular docking studies of PTP, PPP, and PBO derivatives were screened against the “5FSA” protein. PPP derivative displayed a good activity than the other derivatives PTP and PBO in docking with 5FSA protein. The obtained values were ?7.34, ?7.70, and ?5.70 Kcal/Mol for PPP, PTP, and PBO respectively compared to Fluconazole reference value ?7.86 Kcal/Mol.
Nano-Fe3O4?walnut shell/Cu(ii) as a highly effective environmentally friendly catalyst for the one-potpseudothree-component synthesis of 1,3-oxazine derivatives under solvent-free conditions
Fatemeh Mirjalili, Bi Bi,Tafti, Arefeh Dehghani
, p. 31874 - 31880 (2020/09/21)
Fe3O4?walnut shell/Cu(ii) as an eco-friendly bio-based magnetic nano-catalyst was prepared by adding CuCl2to Fe3O4?walnut shell in alkaline medium. A series of 2-aryl/alkyl-2,3-dihydro-1H-naphtho[1,2-e][1,3]oxazines were synthesized by the one-potpseudothree-component reaction of β-naphthol, formaldehyde and various amines using nano-Fe3O4?walnut shell/Cu(ii) at 60 °C under solvent-free conditions. The catalyst was removed from the reaction mixture by an external magnet and was reusable several times without any considerable loss of its activity. This protocol has several advantages such as excellent yields, short reaction times, clean and convenient procedure, easy work-up and use of an eco-friendly catalyst.
