1438-79-5

Basic information

• Product Name: VINYLPENTAMETHYLDISILOXANE
• Synonyms: ethenylpentamethyl-disiloxan;PENTAMETHYLVINYLDISILOXANE;VINYLPENTAMETHYLDISILOXANE;3-Ethenyl-1,1,1,3,3-pentamethyldisiloxane;1,1,1,3,3-Pentamethyl-3-vinylpropanedisiloxane;1,1,3,3,3-Pentamethyl-1-vinylpropanedisiloxane;1-Vinyl-1,1,3,3,3-pentamethylpropanedisiloxane;Dimethyl(trimethylsilyloxy)vinylsilane
• CAS NO: 1438-79-5
• Molecular Formula: C₇H₁₈OSi₂
• Molecular Weight: 174.39
• Mol File: 1438-79-5.mol
• Article Data: 3

Chemical Properties

• Melting Point: <0°C
• Boiling Point: 120 °C
• Flash Point: 12°C
• Appearance: /
• Density: 0.787
• Vapor Pressure: 34.4mmHg at 25°C
• Refractive Index: 1.3930
• CAS DataBase Reference: VINYLPENTAMETHYLDISILOXANE(CAS DataBase Reference)
• NIST Chemistry Reference: VINYLPENTAMETHYLDISILOXANE(1438-79-5)
• EPA Substance Registry System: VINYLPENTAMETHYLDISILOXANE(1438-79-5)

Safety Data

• Statements: 11-36/37/38
• Safety Statements: 3/7-9-16-36/37/39
• RIDADR: 1993
• TSCA: Yes
• Hazardous Substances Data: 1438-79-5(Hazardous Substances Data)

Usage

General Description

VINYLPENTAMETHYLDISILOXANE is a chemical compound that consists of a vinyl group attached to a pentamethylsiloxane backbone. This organosilicon compound is commonly used as a building block in the synthesis of silicone polymers and resins, due to its ability to crosslink and form strong, flexible bonds. It is also utilized in the production of coatings, adhesives, and sealants, as well as in the formulation of personal care products such as skincare and haircare items. VINYLPENTAMETHYLDISILOXANE is known for its high thermal and oxidative stability, as well as its water repellent and dielectric properties, making it a versatile and valuable component in various industrial and consumer applications.

InChI:InChI=1/C7H18OSi2/c1-7-10(5,6)8-9(2,3)4/h7H,1H2,2-6H3

Upstream product

• 857899-86-6 (1-hydrohexafluoroisobutenyloxy)trimethylsilane 
• 1719-58-0 Chlorodimethylvinylsilane 
• 75-77-4 chloro-trimethyl-silane 

Downstream Products

• 18407-16-4 1,1,1,3,3,5,5-heptamethyl-5-phenyl-trisiloxane 
• 1092386-92-9 (E)-[1-(4-bromophenyl)-2-(1,1,3,3,3-pentamethyldisiloxy)]ethene 
• 6231-68-1 1,2-bis(1,1-3,3,3-pentamethyldisiloxanyl)ethane 

Relevant articles and documents

PROCESSES FOR SYNTHESIZING UNSYMMETRICAL DISILOXANES

Described herein are methods for making alkenyl disiloxanes, comprising combining an alkenyl halosilane with an alkyl halosilane and adding the mixture to water, an acidic aqueous solution, or a basic aqueous solution. The ratio of the alkenyl halosilane to the alkyl halosilane is about 10:1 to about 1:10. The alkenyl halosilane and the alkyl halosilane are mixed at about 20 °C to about 45 °C. The reaction product is separated and washed with saturated alkali carbonate solution.

Reaction of 1-hydrohexafluoroisobutenyloxytrimethylsilane with fluoride ion sources. 2,2,2′,2′-Tetrakis(trifluoromethyl)divinyl ether

The reaction of 1-hydrohexafluoroisobutenyloxytrimethylsilane (2a) with cesium fluoride in diglyme leads to elimination of trimethylfluorosilane to form the 1-hydrohexafluoroisobutenolate anion (3), which is silylated with trialkylchlorosilanes at the oxygen atom. In the presence of bis(trifluoromethyl)ketene N,N,O-trimethylaminoacetal or N-(α,α- difluoroalkyl)-dialkylamines, silane 2a is transformed into 2,2,2′, 2′-tetrakis(trifluoromethyl)divinyl ether. The reaction of trifluoroacetic anhydride with N-(1,1,2,2-tetrafluoroethyl)diethylamine affords trifluoroacetyl fluoride in quantitative yield.