Kost, A. N. et al. published their research in Khimiya Geterotsiklicheskikh Soedinenii in 1978 | CAS: 1843-21-6

N-Phenylbenzo[d]thiazol-2-amine (cas: 1843-21-6) belongs to thiazole derivatives. The higher aromaticity of thiazole is due to delocalization of a lone pair of sulfur electrons across the ring, which is evidenced by chemical shifts of ring hydrogen at δ 7.27 and 8.77 ppm (C2 and C4), indicating diamagnetic ring current.Various laboratory methods exist for the organic synthesis of thiazoles. For example, 2,4-dimethylthiazole is synthesized from thioacetamide and chloroacetone.Product Details of 1843-21-6

Cyclization of 1-arylthiosemicarbazides into benzothiazoles was written by Kost, A. N.;Lebedenko, N. Yu.;Sviridova, L. A.;Torocheshnikov, V. N.. And the article was included in Khimiya Geterotsiklicheskikh Soedinenii in 1978.Product Details of 1843-21-6 This article mentions the following:

Benzothiazoles I (R, R1, R2 = H, Cl, Me, R3 = H, Me, Ph) were obtained by cyclization of RR1R2C6H2NHNHCSNHR3 with polyphosphoric acid. In the experiment, the researchers used many compounds, for example, N-Phenylbenzo[d]thiazol-2-amine (cas: 1843-21-6Product Details of 1843-21-6).

N-Phenylbenzo[d]thiazol-2-amine (cas: 1843-21-6) belongs to thiazole derivatives. The higher aromaticity of thiazole is due to delocalization of a lone pair of sulfur electrons across the ring, which is evidenced by chemical shifts of ring hydrogen at δ 7.27 and 8.77 ppm (C2 and C4), indicating diamagnetic ring current.Various laboratory methods exist for the organic synthesis of thiazoles. For example, 2,4-dimethylthiazole is synthesized from thioacetamide and chloroacetone.Product Details of 1843-21-6

Referemce:
Thiazole | C3H3NS – PubChem,
Thiazole | chemical compound | Britannica