1(3H)-Isobenzofuranone,3,3-bis(4-hydroxyphenyl)-

The Phenolphthalein with CAS registry number of 77-09-8 is also known as 3,3-Bis(p-hydroxyphenyl)phthalide. The IUPAC name is 3,3-Bis(4-hydroxyphenyl)-2-benzofuran-1-one. It belongs to product categories of Furan&Benzofuran; Analytical Chemistry; Indicator (pH); pH Indicators; Chemistry; Indicator Solutions; Indicators; Titration; Indicator SolutionsStains and Dyes; P; Stains&Dyes, A to. Its EINECS registry number is 201-004-7. In addition, the formula is C₂₀H₁₄O₄ and the molecular weight is 318.32. This chemical is a white to light yellow crystal powder and should be stored in sealed containers.

Physical properties about Phenolphthalein are: (1)ACD/LogP: 2.63; (2)ACD/LogD (pH 5.5): 2.63; (3)ACD/LogD (pH 7.4): 2.62; (4)ACD/BCF (pH 5.5): 58.76; (5)ACD/BCF (pH 7.4): 57.9; (6)ACD/KOC (pH 5.5): 642.52; (7)ACD/KOC (pH 7.4): 633.18; (8)#H bond acceptors: 4; (9)#H bond donors: 2; (10)#Freely Rotating Bonds: 4; (11)Index of Refraction: 1.693; (12)Molar Refractivity: 88.1 cm³; (13)Molar Volume: 229.7 cm³; (14)Surface Tension: 65 dyne/cm; (15)Density: 1.385 g/cm³; (16)Flash Point: 206.5 °C; (17)Enthalpy of Vaporization: 87.1 kJ/mol; (18)Boiling Point: 557.8 °C at 760 mmHg; (19)Vapour Pressure: 4.76E-13 mmHg at 25 °C.

Preparation of Phenolphthalein: it is prepared by condensation of phthalic anhydride with two equivalents of phenol under acidic conditions.

Uses of Phenolphthalein: it is used to produce 2-(4,4'-dihydroxy-benzhydryl)-benzoic acid. The reaction occurs with reagent zinc, sodium hydroxide and solvent H₂O with other condition of heating for 96 hours. The yield is about 99%. Besides, it is used to perform a presumptive blood test known as the Kastle-Meyer test. It also is used as an acid or base indicator and used in toys.

When you are using this chemical, please be cautious about it. As a chemical, it is irritating to eyes, respiratory system and skin. It is toxic by inhalation and if swallowed. However, there is limited evidence of a carcinogenic effect. What's more, it is highly flammable. During using it, wear suitable protective clothing and gloves. Avoid contact with skin. If contact with eyes accidently, rinse immediately with plenty of water and seek medical advice. In case of accident or if you feel unwell seek medical advice immediately and take precautionary measures against static discharges. After using it, keep container tightly closed away from sources of ignition.

You can still convert the following datas into molecular structure:
1. Canonical SMILES: C1=CC=C2C(=C1)C(=O)OC2(C3=CC=C(C=C3)O)C4=CC=C(C=C4)O
2. InChI: InChI=1S/C20H14O4/c21-15-9-5-13(6-10-15)20(14-7-11-16(22)12-8-14)18-4-2-1-3-17(18)19(23)24-20/h1-12,21-22H
3. InChIKey: KJFMBFZCATUALV-UHFFFAOYSA-N

The toxicity data is as follows: