Results 11 to 20 of about 3,396 (226)

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   +3 more sources

Enantioselective Desymmetrization of 3Substituted Oxetanes: An Efficient Access to Chiral 3,4-Dihydro2H1,4-benzoxazines

, 2021
Herein, we describe a versatile transition metal/oxidant free synthesis of the chiral 2H-1,4-benzoxazines through chiral phosphoric acid (CPA) catalyzed enantioselective desymmetrization of prochiral oxetanes (30 examples) in up to 99% yield and 99 ...
Ivana Císařová, Martin Nigríni, Jan Veselý (1843195), Martin Dračínský, Martin Nigríni (11751478), Viraj A. Bhosale, Jan Veselý, Martin Dračínský (1398268), Viraj A. Bhosale (11751475), Ivana Císařová (1580947)   +9 more
core   +1 more source

Novel Dihydro-1,3,2H-benzoxazine Derived from Furfurylamine: Crystal Structure, Hirshfeld Surface Analysis, Photophysical Property, and Computational Study

Crystals, 2021
Dihydro-1,3,2H-benzoxazines (or benzoxazine monomers) are a class of compounds that have been widely utilized in many areas such as the production of the functional polymers and optoelectronic materials.
Worawat Wattanathana, Yuranan Hanlumyuang, Suttipong Wannapaiboon, Kantapat Chansaenpak, Piyanut Pinyou, Tanin Nanok, Pongsakorn Kanjanaboos   +6 more
doaj   +1 more source

‐[1,4]benzoxazines [PDF]

, 2020
Stereoselectivity in the mutual kinetic resolution (KR) of racemic 3,4-dihydro-3-methyl-2H-[1,4]benzoxazines and racemic 2-aryloxy propionyl chlorides was studied. Based on the results obtained, preparative methods for single enantiomers of a series of 2-
Ganebnykh, I. N., Ilya N. Ganebnykh, Liliya Sh. Sadretdinova, Mikhail I. Kodess, Vakarov, S. A., Levit, G. L., Pervova, M. G., Ezhikova, M. A., Chulakov, E. N., Sadretdinova, L. S., Marina A. Ezhikova, Krasnov, V. P., Kodess, M. I., Sergey A. Vakarov, Marina G. Pervova, Evgeny N. Chulakov, Victor P. Krasnov, Galina L. Levit   +17 more
core   +1 more source

Enantioselective Desymmetrization of 3‑Substituted Oxetanes: An Efficient Access to Chiral 3,4-Dihydro‑2H‑1,4-benzoxazines

, 2021
Herein, we describe a versatile transition metal/oxidant free synthesis of the chiral 2H-1,4-benzoxazines through chiral phosphoric acid (CPA) catalyzed enantioselective desymmetrization of prochiral oxetanes (30 examples) in up to 99% yield and 99 ...
Jan Veselý (1843195), Martin Nigríni (11751478), Martin Dračínský (1398268), Viraj A. Bhosale (11751475), Ivana Císařová (1580947)   +4 more
core   +1 more source

Chiral Lewis Base Catalyzed Enantioselective Selenocyclization of 1,1-Disubstituted Alkenes: Asymmetric Synthesis of Selenium-Containing 4H‑3,1-Benzoxazines

, 2022
An enantioselective selenocyclization of 1,1-disubstituted alkenes was achieved for the first time, which is enabled by a novel combination of a chiral BINAM-derived sulfide and an achiral Lewis acid.
Yao Li (154923), Zhi-Min Chen (1668148), Lu Yu (74016), Yu-Xuan Huo (12710416), Xiao-Song Xue (1433848), Ren-Fei Cao (12073442)   +5 more
core   +1 more source

Photothermal polymerization of benzoxazines

Polymer Chemistry, 2022
Visible irradiation of mixtures of benzoxazine monomers and metal salt catalysts leads to extensive photothermal polymerization, which allows the preparation of complex polybenzoxazine featuresviaphotolithography.
Kevin Reyes-Mateo, Jordi Marquet, Jordi Hernando, Rosa M. Sebastián   +3 more
openaire   +2 more sources

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

Bifunctional benzoxazines: Synthesis and polymerization of resorcinol based single isomers

, 2022
S.1243-1251Aside from their outstanding properties such as thermal and chemical stability and excellent mechanical performance, benzoxazines suffer from high polymerization temperatures.
Koschek, Katharina, Sebastian, Rosa Maria, Arnebold, Andre, Stelten, Johannes, Marquet, Jordi, Schäfer, Hannes, Hartwig, Andreas   +6 more
core   +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