4.5- Diethyl-5-phenylazo

Thiadiazolines were also obtained by a 1,5-dipolar ring reconstruction of mesoionic ylides. The bromine adduct of 2,3-diphenyltetrazolium-5-thiolate (181) reacts with the sodium salt of diethyl malonate to yield as the only product 5,5-bis(ethoxycarbonyl)-4-phenyl-2-phenylazo-2,3-dihydro-1,3,4-thiadiazole (182) (Scheme 33). The same type of product was obtained from reactions with ethyl cyanoacetate and ethyl acetoacetate <88BCJ2979>. 

Phenylarsine bis (diethyl dithiocarbamate), secondary bonding by, 15 30-31 Phenylazidosilanes, properties, 9 141 (Phenylazo)acetaldoxime complexes, osmium, 37 270... 

Imidazol 2-(4-Brom-phenylazo)-4,5-diethyl- E16d, 42 (Azokupplung)... 

Calmagite [l-(l-hydroxy-4-methyl-2-phenylazo)-2-hydroxynaphthalene-4-sulfonic acid] [3147-14-6] M 358.4, m 300", pKi 8.1, pK2 12.4. A erode dye is extracted with anhydrous diethyl ether and forms red crystals from M62CO. It gives a red colom in H2O at pH 7—9 and a blue colom at pH 9—11 which turns red on addition of Ca + or Mg + ions. [Lindstrom Diehl Chem 32 1123 I960]. Complexes with Ca, Mg and Th. 

Diethyl-[4-(4-nitro-2-trifluoromethyl-phenylazo)-phenyl]-amine... 

---