The Trisiloxane,1,1,1,5,5,5-hexamethyl-3-[(trimethylsilyl)oxy]-, with the CAS registry number 1873-89-8, is also known as Tris(trimethylsilyl)silane. It belongs to the product categories of Organometallic Reagents; Organosilicon; Siloxanes. Its EINECS registry number is 217-497-7. This chemical's molecular formula is C₉H₂₈O₃Si₄ and molecular weight is 296.66. What's more, its IUPAC name is Tris(trimethylsilyloxy)silicon. Additionally, it should be preserved hermetically and put in a cool, dry place. You should ensure that workplaces have good ventilation or exhaust. It is clear colorless liquid.

Physical properties about Trisiloxane,1,1,1,5,5,5-hexamethyl-3-[(trimethylsilyl)oxy]-: (1)ACD/LogP: 7.11; (2)# of Rule of 5 Violations: 1; (3)ACD/LogD (pH 5.5): 7.11; (4)ACD/LogD (pH 7.4): 7.11; (5)ACD/BCF (pH 5.5): 148235.53; (6)ACD/BCF (pH 7.4): 148235.53; (7)ACD/KOC (pH 5.5): 174962.39; (8)ACD/KOC (pH 7.4): 174962.39; (9)#H bond acceptors: 3; (10)#H bond donors: 0; (11)#Freely Rotating Bonds: 6; (12)Polar Surface Area: 27.69 Å²; (13)Flash Point: 55 °C; (14)Enthalpy of Vaporization: 40.4 kJ/mol; (15)Boiling Point: 185 °C at 760 mmHg; (16)Vapour Pressure: 0.976 mmHg at 25 °C; (17)Melting point: <0 °C; (18)Density 0.852 g/cm³.

Preparation of Trisiloxane,1,1,1,5,5,5-hexamethyl-3-[(trimethylsilyl)oxy]-: It can be obtained by Hexamethyl-disiloxane. The reaction occurs with reagents Trichlorosilane and H₂SO₄ and solvent H₂O at temperature of 50°C for 0.5 hours. The yield is 75 %.

Uses of Trisiloxane,1,1,1,5,5,5-hexamethyl-3-[(trimethylsilyl)oxy]-: it is used to produce other chemicals. For example, it can react with Allyl-dimethyl-amine to get C₁₄H₃₉NO₃Si₄. The reaction occurs with catalyst Divinyltetramethyldisiloxane platinum complex for 12 hours. The yield is 80 %.

When you are dealing with this chemical, you should be very careful. It’s flammable. So you should avoid contacting with skin and eyes. Additionally, you can not breathe gas/fumes/vapour/spray.

You can still convert the following datas into molecular structure:
(1) SMILES: O([Si](C)(C)C)[SiH](O[Si](C)(C)C)O[Si](C)(C)C
(2) InChI: InChI=1/C9H28O3Si4/c1-14(2,3)10-13(11-15(4,5)6)12-16(7,8)9/h13H,1-9H3
(3) InChIKey: FDWGGTLVZGTDGQ-UHFFFAOYAB