51777-38-9

Basic information

• Product Name: Octakis(trimethylsiloxy)silsesquioxane
• Synonyms: OCTAKIS(TRIMETHYLSILOXY)SILSESQUIOXANE;Octakis[(trimethylsilyl)oxy]-pentacyclo[9.5.1.13,9.15,15.17,13]octasiloxane;Q8M8;Octakis(trimethylsiloxy)silsesquioxane,min.94%;Octakis(trimethylsiloxy)silsesquioxane, min. 94%;Octakis(trimethylsiloxy)silsesquioxane, >=98.5%;octakis(trimethylsiloxy)-t8-silsesquioxane
• CAS NO: 51777-38-9
• Molecular Formula: C24H72O10Si11
• Molecular Weight: 829.76
• Product Categories: organosilicon compounds
• Mol File: 51777-38-9.mol
• Article Data: 4

Chemical Properties

• Boiling Point: 542.3±33.0 °C(Predicted)
• Appearance: /
• Density: 1.11
• Solubility: Sparingly Soluble (0.61 g/L) (25°C), Calc.
• CAS DataBase Reference: Octakis(trimethylsiloxy)silsesquioxane(CAS DataBase Reference)
• NIST Chemistry Reference: Octakis(trimethylsiloxy)silsesquioxane(51777-38-9)
• EPA Substance Registry System: Octakis(trimethylsiloxy)silsesquioxane(51777-38-9)

Safety Data

• Hazardous Substances Data: 51777-38-9(Hazardous Substances Data)

Usage

Uses

Used as flavor and fragrance intermediates. It is an important raw material used intermediate in pharmaceuticals, organic synthesis, dye stuffs and agrochemicals.

Upstream product

• 75-77-4 chloro-trimethyl-silane 
• 107-46-0 Hexamethyldisiloxane 

Relevant articles and documents

Synthetic application of silicates/silanolates and their hydrolyzed polysilanol siloxanes for polyhedral oligomeric silsesquioxanes (POSSs)

Several types of silicate and their hydrolyzed polysilanols were applied to the synthesis of polyhedral oligomeric silsesquioxanes (POSSs). Silicate cubic octasilicate [Si8O20]8? 5 was silylated with trimethylchlorosilane to yield the incompletely trimethylsilylated cubic octasilicate [Si8O20](SiMe3)7H 1b bearing one silanol in addition to the totally trimethylsilylated derivative [Si8O20](SiMe3)8 1a. Further silylation of the monosilanol 1b with dimethylchlorosilane and α,ω-hydridochlorooctamethyltetrasiloxane resulted in the formation of POSSs 1c,d, which have hydrosilyl groups as elongated siloxane side chain. Attempts to generate an amino-substituted POSS via chloromethyldimethylsilylation of silicate 5 followed by reaction with amine as well as lithium amide failed. Amino-substitution was accomplished via the use of amine as a catalyst for the capping reaction of incompletely condensed trisilanol 10b with γ-aminopropyltrimethoxysilane affording mono amino-functionalized POSSs 2b,c in moderate yields. Another group of silanolates 7-9 was hydrolyzed with AcOH or HCl to give the corresponding cyclic polysilanol siloxanes 11a-c, respectively. Amine-catalyzed condensation of several of these polysilanol siloxanes 11a-c resulted in the formation of POSSs in high yields depending on the structure of substrates.

Dendritic, nanosized building block for Siloxane-based materials: A spherosilicate dendrimer

A spherosilicate dendrimer (DMS-1) with closely spaced reaction sites (Si-H groups) on the dendrimer surface has been synthesized by stepwise silylation of double-four-ring silicate with chlorotriethoxysilane (ClSi(OEt)3) and subsequently with chlorodimethylsilane (ClSiHMe2). DMS-1 consists of a maximum of 40 Si atoms in the interior frameworks and 24 reactive Si-H groups on the surface. Because DMS-1 is spherical and about 1.5 nm in diameter, it can be regarded as the smallest well-defined silica-based nanoparticle. DMS-1 also forms molecular crystals and is soluble in typical organic solvents. A molecularly ordered silica-based hybrid can be prepared by heating a cast film of DMS-1 at 180 °C for 5 days. The surface of DMS-1 can be modified by hydrosilylation with 1-hexadecene, triethoxyvinylsilane, and allylic-terminated tetraethylene glycol monomethyl ether. More than 20 Si-H groups out of 24 react with these reagents. The solubilities of the products depend on the modification. DMS-1 is not only a building block for nanohybrids, but also the smallest and most precisely designed siloxane-based nanoparticle.