a -Naphtholphthalein CAS Registry Number: 596-01-0 α-萘酚酞指示剂
CAS Name: 3,3-Bis(4-hydroxynaphthalenyl)-1(3H)-isobenzofuranone
Additional Names: 3,3-bis(4-hydroxy-1-naphthyl)phthalide; di-p-a-naphtholphthalide; p-a-naphtholphthalein
Percent Composition: C 80.37%, H 4.34%, O 15.29%
📌 参考资料/链接：
Literature References: Prepn: Werner, J. Chem. Soc. 113, 20 (1918). Commercial prepn contains a small amount of the isomeric 3,3-bis(2-hydroxy-1-naphthyl)phthalide.
📄 详细内容
Properties: Colorless powder when pure; usually grayish-red. mp 253-255°. Practically insol in water. Sol in alcohol.
Melting point: mp 253-255°
Use: As indicator in 0.1% or 0.04% soln in alc. pH 7.3 colorless to reddish; 8.7 greenish to blue. Particularly adapted for weak acids in strong alcoholic soln.
产品链接: 596-01-0››