4-苯基脲唑

• 产品号: L00255
• CAS号: 15988-11-1
• 分子式: C8H7N3O2
• 分子量: 177.16008
• 纯 度: 98+%

产品别名

• 标题: 4-Phenylurazole
• IUPAC标准名: 4-phenyl-1,2,4-triazolidine-3,5-dione
• IUPAC传统名: 4-phenyl-1,2,4-triazolidine-3,5-dione
• 别名: 4-Phenyl-1,2,4-triazolidine-3,5-dione

产品登记号

• CAS号: 15988-11-1
• EC号: 240-127-0
• Beilstein号: 163361
• MDL号: MFCD00005226

产品性质

• 纯度: 98+%
• 熔点: 206-210°C
• TSCA收录: 是

参考文献

• Reacts with enolizable ketones in the presence of TFA to give ɑ-urazyl ketones: J. Org. Chem., 55, 193 (1990), which may be oxidized to ɑ-diketones with t-butyl hypochlorite: J. Org. Chem., 55, 197 (1990):
  
• ?-Diketones form adducts without an added catalyst. These yield 1,2,3-triketones on cleavage.
• Review of use of azodicarbonyl compounds in synthesis: Adv. Het. Chem., 30, 1 (1982).
• 1,2,4-Triazolinediones form charge-transfer complexes with electron-rich aromatics, such as di- or trimethoxybenzenes: J. Org. Chem., 48, 1708 (1983).
• Oxidation gives the aza-dienophile 4-phenyl-1,2,4-triazolinedione which is more reactive in cycloaddition reactions than tetracyanoethylene: J. Chem. Soc. (C), 1905 (1967); Angew. Chem. Int. Ed., 11, 715 (1972); Org. Prep. Proced. Int., 7, 251 (1975). Suitable oxidants include t-butyl hypochlorite: Org. Synth. Coll., 6, 936 (1988), or lead(IV) acetate: J. Org. Chem., 32, 330 (1967). For a further example, see Propargyltriphenylphosphonium bromide, A12753.
• The adducts can be cleaved to the hydrazo-compounds by hydrazine hydrate. Cu(II) oxidation provides a route to azoalkanes: Synthesis, 543 (1981).