Catalytic synthesis of benzimidazoles and organic carbamates using a polymer supported zinc catalyst through CO2 fixation was written by Biswas, Imdadul Haque;Biswas, Surajit;Islam, Sarikul Md;Riyajuddin, Sk;Sarkar, Priyanka;Ghosh, Kaushik;Islam, Sk Manirul. And the article was included in New Journal of Chemistry in 2019.COA of Formula: C8H8N2 This article mentions the following:
Utilization of carbon dioxide in chem. fixation for synthesis of fine chems. like benzimidazoles, organic carbamates, etc. is in high demand in recent years as carbon dioxide is a cost effective, sustainable, and green renewable C1 source. In this article we present the design and synthesis of an organically modified polystyrene bound heterogeneous [PS-Zn(II)-SALTETA] catalyst. The catalyst has been characterized thoroughly by Fourier transform IR spectroscopy, at. absorption spectroscopy, thermogravimetric anal., PXRD, SEM and EDAX studies. The catalyst was used for cyclization of o-phenylenediamines through insertion of carbon dioxide in order to produce benzimidazoles in the presence of dimethylamine borane (DMAB). The developed catalytic procedure is sustainable, economical and efficient owing to the utilization of ethanol/water as a biodegradable and environment friendly solvent system. Besides benzimidazole production the catalyst was also very active for manufacture of organic carbamates from anilines and Bu bromide under atm. CO2 pressure under solvent free conditions at room temperature and the catalytic protocol showed outstanding functional group tolerance. Moreover the catalyst is highly recyclable and reusable. In the experiment, the researchers used many compounds, for example, 7-Methyl-1H-benzo[d]imidazole (cas: 4887-83-6COA of Formula: C8H8N2).
7-Methyl-1H-benzo[d]imidazole (cas: 4887-83-6) belongs to imidazole derivatives. Imidazole is a heterocyclic compound with a five-membered planar ring. It is amphoteric and highly polar. This ring system is present in important biological building blocks, such as histidine and the related hormone histamine.COA of Formula: C8H8N2
Referemce:
Imidazole – Wikipedia,
Imidazole | C3H4N2 – PubChem