The Benzene,1,1',1''-(2-propen-1-ylsilylidyne)tris-, with the CAS registry number 18752-21-1, is also known as Allyl(triphenyl)silane. It belongs to the product categories of Organometallic Reagents; Organosilicon; Others. This chemical's molecular formula is C₂₁H₂₀Si and molecular weight is 300.47. What's more, its systematic name is triphenyl(prop-2-en-1-yl)silane. When you are using this chemical, please be cautious about it. Do not breathe dust. What's more, you should avoid contact with skin and eyes. 

Physical properties of Benzene,1,1',1''-(2-propen-1-ylsilylidyne)tris- are: (1)ACD/LogP: 7.25; (2)# of Rule of 5 Violations: 1; (3)#H bond acceptors: 0; (4)#H bond donors: 0; (5)#Freely Rotating Bonds: 5; (6)Polar Surface Area: 0 Å²; (7)Index of Refraction: 1.595; (8)Molar Refractivity: 98.58 cm³; (9)Molar Volume: 290 cm³; (10)Polarizability: 39.08×10^-24cm³; (11)Surface Tension: 38.1 dyne/cm; (12)Density: 1.03 g/cm³; (13)Flash Point: 170.2 °C; (14)Enthalpy of Vaporization: 60.39 kJ/mol; (15)Boiling Point: 380.4 °C at 760 mmHg; (16)Vapour Pressure: 1.19E-05 mmHg at 25°C.

Preparation: this chemical can be prepared by chloro-triphenyl-silane and allylmagnesium chloride at the ambient temperature. This reaction will need tetrahydrofuran with the reaction time of 5 hours. The yield is about 99%.

Uses of Benzene,1,1',1''-(2-propen-1-ylsilylidyne)tris-: it can be used to produce fluoro-triphenyl-silane at the temperature of 25°C. It will need reagent SbF₅ intercalated in graphite and solvent diethyl ether with the reaction time of 10 hours. The yield is about 70%.

You can still convert the following datas into molecular structure:
(1)SMILES: C(=C)\C[Si](c1ccccc1)(c2ccccc2)c3ccccc3
(2)Std. InChI: InChI=1S/C21H20Si/c1-2-18-22(19-12-6-3-7-13-19,20-14-8-4-9-15-20)21-16-10-5-11-17-21/h2-17H,1,18H2
(3)Std. InChIKey: DXJZZRSMGLGFPW-UHFFFAOYSA-N