1438-82-0

Basic information

• Product Name: PENTAMETHYLDISILOXANE
• Synonyms: pentamethyl-disiloxan;PENTAMETHYLDISILOXANE;PENTAMETHYLDISILOXANE 97+%;(Trimethylsiloxy)dimethylsilane;1,1,1,3,3-Pentamethylpropanedisiloxane;2,2,4-Trimethyl-3-oxa-2,4-disilapentane;Trimethylsiloxydimethylsilane;Dimethyl(trimethylsilyloxy)silane
• CAS NO: 1438-82-0
• Molecular Formula: C₅H₁₆OSi₂
• Molecular Weight: 148.35
• EINECS: 215-873-5
• Product Categories: Chemical Synthesis;Organometallic Reagents;Organosilicon;Siloxanes
• Mol File: 1438-82-0.mol
• Article Data: 13

Chemical Properties

• Boiling Point: 86 °C(lit.)
• Flash Point: -9°C
• Appearance: /
• Density: 0.760 g/mL at 20 °C(lit.)
• Refractive Index: n20/D 1.373
• Water Solubility: Not miscible or difficult to mix in water.
• Sensitive: Moisture Sensitive
• BRN: 1734568
• CAS DataBase Reference: PENTAMETHYLDISILOXANE(CAS DataBase Reference)
• NIST Chemistry Reference: PENTAMETHYLDISILOXANE(1438-82-0)
• EPA Substance Registry System: PENTAMETHYLDISILOXANE(1438-82-0)

Safety Data

• Hazard Codes: F
• Statements: 11
• Safety Statements: 16-23-24/25
• RIDADR: UN 1993 3/PG 2
• WGK Germany: 3
• F: 10-21
• TSCA: Yes
• HazardClass: 3
• PackingGroup: II
• Hazardous Substances Data: 1438-82-0(Hazardous Substances Data)

Usage

Uses

Different sources of media describe the Uses of 1438-82-0 differently. You can refer to the following data:
1. Pentamethyldisiloxane, is an organosilicon compound used in synthesis of siloxane-polyether copolymer surfactants. Pentamethyldisiloxane can also be used as source of the trimethylsilyl functional group in organic synthesis.
2. Pentamethyldisiloxane is used in the synthesis of siloxane-polyether copolymer surfactants. It is also used as source of trimethylsilyl functional group in organic synthesis.

Synthesis

Take prepared potassium trimethylsilanolate 1.12kg in 2L of anhydrous tetrahydrofuran, was added dropwise with stirring dimethylchlorosilane1kg, dropwise, room temperature reaction 1h, filtered, concentrated, extracted with ether, dried and concentrated to give a high purity of 98% or more of pentamethyl disiloxane 1.2kg.

InChI:InChI=1/C5H15OSi2/c1-7(2)6-8(3,4)5/h1-5H3

Upstream product

• 1066-40-6 Trimethylsilanol 
• 15933-59-2 1,1,3,3-tetramethyldisilazane 
• 3277-26-7 1,1,3,3-Tetramethyldisiloxane 
• 107-46-0 Hexamethyldisiloxane 
• 1066-35-9 dimethylmonochlorosilane 
• 10519-96-7 potassium trimethylsilonate 
• 98-83-9 isopropenylbenzene 
• 812-15-7 1,1,1,2,2-pentamethyldisilane 
• 2441-21-6 iododimethylsilane 
• 1825-62-3 ethyl trimethylsilyl ether 
• 18156-38-2 methoxypentamethyldisiloxane 
• 2943-62-6 1-chloro-1,1,3,3,3-pentamethyldisiloxane 
• 75-54-7 Dichloromethylsilane 
• 75-77-4 chloro-trimethyl-silane 

Downstream Products

• 23029-21-2 γ-(aminopropyl)pentamethyldisiloxane 
• 14579-47-6 1-cyclohexyl-1,1,3,3,3-pentamethyldisiloxane 
• 18151-85-4 <1-(2-methylpropenoyloxy)propyl>pentamethyldisiloxane 
• 6231-68-1 1,2-bis(1,1-3,3,3-pentamethyldisiloxanyl)ethane 
• 834-14-0 p-benzylanizole 
• 33335-65-8 C₅H₁₅OSi₂⁽¹⁺⁾ 
• 3277-26-7 1,1,3,3-Tetramethyldisiloxane 
• 107-46-0 Hexamethyldisiloxane 
• 1873-88-7 1,1,1,3,5,5,5-heptamethyltrisiloxan 
• 107-51-7 octamethyltrisiloxabe 
• 141-62-8 decamethyltetrasiloxane 
• 2895-07-0 1,1,1,3,3,5,5-heptamethyltrisiloxane 
• 77606-50-9 M₂DDH 
• 208661-38-5 (Z)-1,1,1,3,3-pentamethyl-3-styryldisiloxane 

Relevant articles and documents

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Kinetic Investigation of the Platinum-catalysed Hydrosilylation of Vinylsiloxanes with Hydrogensiloxanes

A kinetic investigation of the platinum-catalysed hydrosilylation of monofunctional oligomeric vinylsiloxanes by monofunctional oligomeric hydrogensiloxanes was performed under stoichiometric conditions with use of quantitative 1H-NMR spectrometry.The reaction rate up to 50percent conversion can be expressed by v=k .During further hydrosilylation the kinetic changed to second order.No induction period was observed.A hydrogensiloxane with a dimethylsilyl end group gives much higher rates than a siloxane with a methylsiloxy group.The main reactions of all hydrosilylations, determined by GC-MS and 29Si-NMR, are β-additions.Less then 5percent α-products are obtained.

Preparation method and application of trimethyl silicon alkoxide

The invention discloses a preparation method and an application of trimethyl silicon alkoxide. The preparation method includes the preparation steps: placing hexamethyldisiloxane and potassium hydroxide into a 10L three-mouth flask; adding 10ml of alcohol preparations; performing heating reflux for 48 hours; dividing water by a water knockout trap; cooling, filtering and drying materials to obtain white solid potassium trimethylsilanolate. Inexpensive trimethyl silicon alkoxide (MM) in industrial production serves as a raw material, and the trimethyl silicon alkoxide and the potassium hydroxide are subjected to heating reflux reaction under various catalysts to prepare potassium trimethylsilanolate with high content. All the catalysts are beneficial to dissolution of the potassium hydroxide, and reaction is facilitated.

Effect of catalyst structure on the reaction of α-methylstyrene with 1,1,3,3-tetramethyldisiloxane

Reaction of α-methylstyrene with 1,1,3,3-tetramethyldisiloxane in the presence of the complexes of platinum(II), palladium(II) and rhodium(I) is explored. It is established that in the presence of platinum catalyst predominantly occurs hydrosilylation of α-methylstyrene leading to formation of β-adduct, on palladium catalysts proceeds reduction of α-methylstyrene, on rhodium catalysts both the processes take place. In the reaction mixture proceeds disproportion and dehydrocondensation of 1,1,3,3-tetramethyldisiloxane that leads to formation of long chain linear and cyclic siloxanes of general formula HMe2Si(OSiMe2) n H and (-OSiMe2-)m (n = 2-6, m = 3-7), respectively. Platinum catalysts promotes formation of linear siloxanes, while both rhodium and palladium catalysts afford linear and cyclic siloxanes as well. Structure of intermediate metallocomplexes is studied.

Liquid-phase oxidation of pentamethyldisilane with oxygen [3]

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