16066-10-7

Basic information

• Product Name: TETRAETHYLCYCLOTETRASILOXANE
• Synonyms: TETRAETHYLCYCLOTETRASILOXANE;Tetraethylcyclotetrasiloxanecontains other cyclics;Cyclotetrasiloxane,2,4,6,8-tetraethyl-;1,3,5,7-TETRAETHYLCYCLOTETRASILOXANE, 95%;2,4,6,8-Tetraethylcyclotetrasiloxane
• CAS NO: 16066-10-7
• Molecular Formula: C₈H₂₄O₄Si₄
• Molecular Weight: 296.62
• Mol File: 16066-10-7.mol

Chemical Properties

• Melting Point: <0°C
• Boiling Point: 105 °C
• Flash Point: >65°C
• Appearance: /
• Density: 0.9808
• Vapor Pressure: 0.254mmHg at 25°C
• Refractive Index: 1.4141
• CAS DataBase Reference: TETRAETHYLCYCLOTETRASILOXANE(CAS DataBase Reference)
• NIST Chemistry Reference: TETRAETHYLCYCLOTETRASILOXANE(16066-10-7)
• EPA Substance Registry System: TETRAETHYLCYCLOTETRASILOXANE(16066-10-7)

Safety Data

• Statements: 36/37/38
• Safety Statements: 26-36/37/39
• TSCA: No
• Hazardous Substances Data: 16066-10-7(Hazardous Substances Data)

Usage

Uses

Used in Silicone Polymer Production:
Tetraethylcyclotetrasiloxane is used as a key component in the production of silicone polymers due to its robust molecular weight and high boiling point. These silicone polymers are essential in the creation of various products.
Used in Coatings Industry:
In the coatings industry, Tetraethylcyclotetrasiloxane is used as a raw material for silicone polymers, which are then utilized in the formulation of coatings. These coatings are valued for their durability, weather resistance, and ability to adhere to various surfaces.
Used in Sealants Industry:
Tetraethylcyclotetrasiloxane is used as a precursor for silicone polymers in the sealants industry. The resulting silicone sealants are known for their flexibility, adhesion, and resistance to moisture, making them ideal for sealing joints and gaps in construction and automotive applications.
Used in Adhesives Industry:
In the adhesives industry, Tetraethylcyclotetrasiloxane is used to produce silicone polymers that serve as the basis for various adhesive formulations. These silicone adhesives are appreciated for their strong bonding capabilities, resistance to temperature extremes, and flexibility.
Safety and Toxicology:
The safety and toxicology of Tetraethylcyclotetrasiloxane are managed under regulations specific to siloxanes and silicones, ensuring that its use in various industries is controlled and monitored to minimize potential health and environmental risks.

InChI:InChI=1/C8H24O4Si4/c1-5-13-9-14(6-2)11-16(8-4)12-15(7-3)10-13/h13-16H,5-8H2,1-4H3

Upstream product

• 1789-58-8 ethyldichlorosilane 
• 75-77-4 chloro-trimethyl-silane 

Downstream Products

• 28229-47-2 2,4,6,8-Tetraethyl-2,4,6,8-tetrakis-(2-phenyl-propyl)-[1,3,5,7,2,4,6,8]tetroxatetrasilocane 

Relevant articles and documents

Unexpected reactions of dichloro(ethyl)silane with DMSO in organic solvents

The effect of the solvent nature on the composition of the products formed upon the reaction between EtSi(H)Cl2 and DMSO (molar ratio 1: 1, 0 °C) was revealed. This reaction in non-polar and low polar solvents (toluene, chloroform) gives oligoethyl(hydro)cyclo-siloxanes ((EtSi(H)O)n, n = 3—8) as the major products in the yields up to 77%. In MeCN, oligoethyl(hydro)cyclosiloxanes are formed along with cyclic monochlorinated siloxanes ((EtSi(H)O)n(EtSi(Cl)O), n = 2—7) in a ratio of ~7: 3 (68: 29 wt.%). In excess diethyl ether, the overall yield of oligoethyl(hydro)cyclosiloxanes does not exceed 25% and the major products are linear α,ω-diethoxyoligoethyl(hydro)siloxanes (EtO(EtSi(H)O)nEt, n = 2—7) formed in 70—75% yields. A plausible reaction mechanism leading to the final products was suggested. Apparently, the reaction proceeds via ethyl(hydro)-and chloro(ethyl)silanones as intermediates.

FEATURES OF INFLUENCE OF HCl ON HYDROLYTIC COPOLYCONDENSATION OF BIFUNCTIONAL ORGANOCHLOROSILANES WITH TRIMETHYLCHLOROSILANE

The hydrogen chloride that is formed in the hydrolytic copolycondensation of R'RSiCl2 with Me3SiCl affects the composition of the reaction products only at cocentrations above 30-35percent, where it is responsible for splitting out the terminal trimethylsiloxy group.The stability of the terminal groups increases with increasing size of the substituents on the silicon atom in the R'RSiCl2.The total yield of Me3SiO(R'RSiO)mSiMe3 with m = 1-4 also increases with increasing size of the substituents on the silicon atom in the R'RSiCl2.The total yield of p with p = 3-5 increases with decreasing tendency of the R'RSiCl2 to form rings by hydrolytic polycondensation, and with increasing sensitivity of the terminal trimethylsiloxy group in the cocondensation products to the action of HCl and its activity with respect to the siloxane bond.