Structures comprising Two Five-Membered Rings

Structures comprising Two Five-Membered Rings (5,5). - Thiazolo[3,2-dJ-tetrazoles [CN/ -C- S]. l-Aryl-5-mercaptotetrazoles react with 4-XCeH4-COCHaBr. The resulting derivatives are cyclized to l,5-diaryl-l -thiazolo[3,2-d tetrazol-4-ium perchlorates (218).  

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Structures comprising Two Five-Membered Rings and One Six-Membered... 

Structures comprising Two Five-Membered Rings (5,5).—Thiazolo[3,2-d]-tetrazoles [CA/4-C,7V5 ]. A " C n.m.r. study of the products of quaternization... 

Structures comprising Two Five-Membered Rings and One Six-Membered Ring (5,5,6).—l,2,4-Triazolo[3,4-h]benzothiazole [C2N3-C3NS-C6]. The 3-aryl derivatives (157) were prepared by oxidation of 2-arylhydrazones of benzo-thiazole, using lead tetra-acetate. ... 

Structures comprising Two Five-Membered Rings and One Seven-Membered Ring (5,5,7).—Azuleno[2,l-d]thiazoles [C3NS-CS-C7]. The reaction between the substituted azulenes (171 R = H or C02Et) and neutral or basic alumina gives the title compounds (172). ... 

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