The 9,9'-Spirobi(9H-fluorene), with the CAS registry number 159-66-0, has the systematic name and IUPAC name of 9,9'-spirobifluorene. It belongs to the product categories of Fluorene Derivatives and Electronic Chemicals. And the molecular formula of this chemical is C₂₅H₁₆.

The physical properties of 9,9'-Spirobi(9H-fluorene) are as following: (1)ACD/LogP: 0.54; (2)# of Rule of 5 Violations: 0; (3)ACD/LogD (pH 5.5): -1.96; (4)ACD/LogD (pH 7.4): -1.97; (5)ACD/BCF (pH 5.5): 1; (6)ACD/BCF (pH 7.4): 1; (7)ACD/KOC (pH 5.5): 1; (8)ACD/KOC (pH 7.4): 1; (9)#H bond acceptors: 3; (10)#H bond donors: 2; (11)#Freely Rotating Bonds: 1; (12)Polar Surface Area: 29.54 Å²; (13)Index of Refraction: 1.576; (14)Molar Refractivity: 47.88 cm³; (15)Molar Volume: 144.5 cm³; (16)Polarizability: 18.98×10^-24cm³; (17)Surface Tension: 48.2 dyne/cm; (18)Density: 1.225 g/cm³; (19)Flash Point: 178 °C; (20)Enthalpy of Vaporization: 65.16 kJ/mol; (21)Boiling Point: 370.7 °C at 760 mmHg; (22)Vapour Pressure: 3.77E-06 mmHg at 25°C.

Preparation of 9,9'-Spirobi(9H-fluorene): This chemical can be prepared by 9-biphenyl-2-yl-fluoren-9-ol. The reaction will need reagents HOAc and HCl, and the solvent H₂O. And the yield is about 96%. 

Uses of 9,9'-Spirobi(9H-fluorene): It can react with dichloro-methoxy-methane to produce 2-carboxaldehyde-9,9'-spirobifluorene. This reaction will need reagent TiCl₄, and the solvent CH₂Cl₂. The reaction time is 1 hour with temperature of 0-20°C, and the yield is about 30%.

You can still convert the following datas into molecular structure:
(1)SMILES: O=C(O)C2c1c(cccc1)CCN2
(2)InChI: InChI=1/C10H11NO2/c12-10(13)9-8-4-2-1-3-7(8)5-6-11-9/h1-4,9,11H,5-6H2,(H,12,13)
(3)InChIKey: OXFGRWIKQDSSLY-UHFFFAOYAG