On February 2, 2021, Chen, Haifeng; Ye, Zhonghua; Zhang, Zhaochao; Li, Chong published a patent.COA of Formula: C8H5IO The title of the patent was Preparation of benzoxazole or benzothiazole derivatives containing carbazole structure for organic light emitting devices. And the patent contained the following:
The invention relates to the preparation of benzoxazole or benzothiazole derivatives with general formula I containing carbazole structure for organic electroluminescent devices [where L1, L2, L3 = single bond, substituted or unsubstituted C6-C30 arylene, substituted or unsubstituted C2-C30 heteroarylene; X = O or S; R1 = substituted or unsubstituted 5-60 membered heteroaryl containing one or more heteroatoms], which has the following advantages: high glass transition temperature, low evaporation temperature, good thermal stability, low extinction coefficient, high refractive index, high luminous efficiency, and low energy consumption. For example, 2,2′-(9-(4-(benzo[d]oxazol-2-yl)phenyl)-9H-carbazole-3,6-diyl)bis(benzo[d]oxazole) was prepared by condensation reaction of 3,6-dibromo-9H-carbazole with 2-(4-iodophenyl)benzo[d]oxazole, and then condensation reaction with benzo[d]oxazole. The title compounds can be used to prepare organic light emitting devices. The experimental process involved the reaction of 5-Iodobenzofuran(cas: 60770-67-4).COA of Formula: C8H5IO
The Article related to condensation suzuki coupling preparation benzoxazole benzothiazole carbazole oled, Heterocyclic Compounds (More Than One Hetero Atom): Thiazoles, Isothiazoles and other aspects.COA of Formula: C8H5IO
Referemce:
Benzofuran – Wikipedia,
Benzofuran | C8H6O – PubChem