Synthesis of triphenylamines via ligand-free selective ring-opening of benzoxazoles or benzothiazoles under superparamagnetic nanoparticle catalysis was written by Nguyen, Oanh T. K.;Nguyen, Long T.;Truong, Nhu K.;Nguyen, Viet D.;Nguyen, Anh T.;Le, Nhan T. H.;Le, Dung T.;Phan, Nam T. S.. And the article was included in RSC Advances in 2017.COA of Formula: C9H9NO This article mentions the following:
CuFe2O4 superparamagnetic nanoparticles were utilized as an effective recyclable heterogeneous catalyst for the synthesis of triphenylamines 2-HY-R-C6H3N(C6H4R1)2 (R = H, 5-Me; R1 = H, 2-Me, 3-MeO, etc.; Y = S, O) via the ligand-free selective ring-opening reaction of benzoxazole, 2,5-dimethylbenzoxazole or benzothiazole with iodoarenes R1C6H4X (X = I, Br, Cl). The nano CuFe2O4 demonstrated noticeably higher catalytic efficiency than a series of homogeneous catalysts and heterogeneous catalysts. It was possible to sep. the nano CuFe2O4 by using a magnet, and the recovered catalyst was reused many times while its activity could be maintained. This is the first example of heterogeneous catalysis for the transformation of benzoxazoles, and the transformation of benzothiazoles to triphenylamines has been reported. In the experiment, the researchers used many compounds, for example, 2,5-Dimethylbenzoxazole (cas: 5676-58-4COA of Formula: C9H9NO).
2,5-Dimethylbenzoxazole (cas: 5676-58-4) belongs to benzoxazole derivatives. Benzoxazole derivatives have gained a lot of importance in the past few years because of their use in intermediates for the preparation of new biological materials. Due to its versatile biological properties, benzoxazole has been incorporated as an essential pharmacophore and substructure in many medicinal compounds.COA of Formula: C9H9NO
Referemce:
Benzoxazole – Wikipedia,
Benzoxazole | C7H5NO – PubChem