70693-47-9

Basic information

• Product Name: 1,1,1,3,3-PENTAMETHYL-3-ACETOXYDISILOXANE
• Synonyms: pentamethyl-disiloxanoacetate;1,1,1,3,3-PENTAMETHYL-3-ACETOXYDISILOXANE;1-Acetoxy-1,1,3,3,3-pentamethyldisiloxane;pentamethyldisiloxanyl acetate;3-Acetoxy-1,1,1,3,3-pentamethyldisiloxane;1,1,3,3-Tetramethyl-2-oxa-1,3-disilabutan-1-ol acetate;Pentamethylpropanedisiloxane-1-ol acetate
• CAS NO: 70693-47-9
• Molecular Formula: C₇H₁₈O₃Si₂
• Molecular Weight: 206.39
• EINECS: 274-767-7
• Mol File: 70693-47-9.mol
• Article Data: 6

Chemical Properties

• Boiling Point: 149 °C
• Flash Point: 40°C
• Appearance: /
• Density: 0.9
• Vapor Pressure: 4.03mmHg at 25°C
• Refractive Index: 1.3887
• CAS DataBase Reference: 1,1,1,3,3-PENTAMETHYL-3-ACETOXYDISILOXANE(CAS DataBase Reference)
• NIST Chemistry Reference: 1,1,1,3,3-PENTAMETHYL-3-ACETOXYDISILOXANE(70693-47-9)
• EPA Substance Registry System: 1,1,1,3,3-PENTAMETHYL-3-ACETOXYDISILOXANE(70693-47-9)

Safety Data

• Hazard Codes: C
• Statements: 10-34
• Safety Statements: 26-36/37/39-45
• RIDADR: UN 2924 3/PG 3
• TSCA: Yes
• Hazardous Substances Data: 70693-47-9(Hazardous Substances Data)

Usage

General Description

1,1,1,3,3-Pentamethyl-3-acetoxydisiloxane is a chemical compound with the molecular formula C11H28O2Si2. It is a colorless and odorless liquid used as a crosslinking agent in the production of silicone rubber and silicone sealants. 1,1,1,3,3-PENTAMETHYL-3-ACETOXYDISILOXANE contains two silicon atoms bonded to three oxygen atoms and a hydrocarbon chain. It is known for its water-repellent properties and is commonly used in the manufacturing of waterproof coatings and textiles. Additionally, 1,1,1,3,3-Pentamethyl-3-acetoxydisiloxane is used in the electronics and automotive industries for various applications, such as adhesives, anti-foaming agents, and mold release agents. However, it is important to handle and store this chemical with care, as it can be flammable and may cause irritation upon contact with skin or eyes.

InChI:InChI=1/C7H18O3Si2/c1-7(8)9-12(5,6)10-11(2,3)4/h1-6H3

Upstream product

• 2943-62-6 1-chloro-1,1,3,3,3-pentamethyldisiloxane 
• 108-24-7 acetic anhydride 
• 64-19-7 acetic acid 
• 507-02-8 acetyl iodide 
• 107-51-7 octamethyltrisiloxabe 
• 1438-82-0 1,1,1,3,3-pentamethyl-1,3-disiloxane 
• 7440-05-3 palladium 
• 591-87-7 Allyl acetate 

Downstream Products

• 556-70-7 docosamethyl-decasiloxane 
• 541-01-5 hexadecamethylheptasiloxane 

Relevant articles and documents

Ir-catalyzed hydrosilylation reaction of allyl acetate with octakis(dimethylsiloxy)octasilsesquioxane and related hydrosilanes

Hydrosilylation reaction of allyl acetate (AA) with octakis(dimethylsiloxy) octasilsesquioxane [(HSiMe2O)8(SiO1.5) 8] was efficiently catalyzed by chloro(1,5-cyclooctadiene)iridium(I) dimer [Ir(μ-Cl)(COD)]2

Kinetics of the condensation of oligosiloxanes containing acetoxyl and hydroxyl end groups catalyzed by uncharged nucleophiles in an acid-base inert solvent

Condensation of undecamethylpentasiloxane-1-ol (1) with 1-acetoxypentamethyldisiloxane (2) in methylene chloride in the presence of uncharged bases has been studied as a model for the coupling of acetoxyl and hydroxyl ended polydimethylsiloxane chains.Triethylamine acts not only as the acceptor of the acid released in the process but also as a Broensted base catalyst activating silanol group.However, weakly basic but strongly nucleophilic N-heterocycles such as 4-dimethylaminopyridine are more effective catalysts promoting the condensation by acting as nucleophiles to activate the acetoxysilane.

REACTIONS IN THE CHLOROSILANE-SILANOL-SILOXANE SYSTEM

We obtained the first ?*-values and ES-values for siloxy groups by spectroscopic and kinetic methods.Detailed mechanistic investigations are performed on the hydrolysis of chlorosilanes, the cleavage of Si-O-Si bonds by HCl, and the substituent exchange reaction between silanols and chlorosilanes.