26980-40-5

Basic information

• Product Name: 1,1,1,2,2-pentachloro-2-methyldisilane
• Synonyms: 1,1,1,2,2-Pentachloro-2-methyldisilane; disilane, 1,1,1,2,2-pentachloro-2-methyl-
• CAS NO: 26980-40-5
• Molecular Formula: CH₃Cl₅Si₂
• Molecular Weight: 248.4705
• Mol File: 26980-40-5.mol
• Article Data: 1

Chemical Properties

• Boiling Point: 155.9°C at 760 mmHg
• Flash Point: 46.3°C
• Density: 1.432g/cm³
• Vapor Pressure: 3.82mmHg at 25°C
• Refractive Index: 1.469
• CAS DataBase Reference: 1,1,1,2,2-pentachloro-2-methyldisilane(CAS DataBase Reference)
• NIST Chemistry Reference: 1,1,1,2,2-pentachloro-2-methyldisilane(26980-40-5)
• EPA Substance Registry System: 1,1,1,2,2-pentachloro-2-methyldisilane(26980-40-5)

Safety Data

• Hazardous Substances Data: 26980-40-5(Hazardous Substances Data)

Usage

General Description

1,1,1,2,2-pentachloro-2-methyldisilane is a chemical compound with the molecular formula C2H10Cl5Si2. It is also known by its trade name, "H-Series Disilane," and is commonly used as a silicone intermediate for the production of various silicone-based materials. 1,1,1,2,2-pentachloro-2-methyldisilane is a colorless, volatile liquid with a molecular weight of 267.81 g/mol. It is highly reactive and can be used as a building block for the synthesis of more complex organosilicon compounds. 1,1,1,2,2-pentachloro-2-methyldisilane is also used in the manufacturing of silicone polymers, resins, and adhesives due to its excellent water-repellent and electrical insulation properties. However, it is important to handle this compound with caution, as it is hazardous if not properly controlled and managed.

Upstream product

• 4342-61-4 1,2-dichlorotetramethylsilane 

Downstream Products

• 98-13-5 Phenyltrichlorosilane 
• 149-74-6 dichloromethylphenylsilane 
• 75-79-6 Methyltrichlorosilane 
• 35483-48-8 1,1-Dichloro-1-methyl-disilane 
• 1066-45-1 trimethyltin(IV)chloride 

Relevant articles and documents

Interactions of chloromethyldisilanes with tetrakis(dimethylamino)ethylene (TDAE), formation of [TDAE] [Si3Me2Cl7]

The chlorodisilanes SiClMe2-SiClMe2 (1), SiCl2Me-SiCl2Me (2), SiCl3-SiCl3 (3) and a 9:1 mixture of 2 and SiCl3-SiCl2Me (4) were reacted with the electron-rich alkene tetrakis-(dimethylamino)-ethylene (TDAE) in n-hexane as well as in polar solvents. While 1 gave no reaction at all, 3 underwent a disproportionation reaction into SiCl4 and Si(SiCl3)4. Also 2 and mixtures of 2 and 4 were disproportionated into MeSiCl3 (2a) and methylchlorooligosilanes. Additionally a crystalline mixture of Si3Me3Cl6 -TDAE (5a) plus Si3Me2Cl7 -TDAE (5b) was obtained by reaction of a 9:1 mixture of 2 and 4 with TDAE in n-hexane as well as in 1,2-dimethoxyethane. The reaction of 2 with TDAE in acetonitrile (MeCN) led to a crystalline precipitation of [TDAE]Cl2 -MeCN (6.MeCN) in addition to MeSiCl3 and methylchlorooligosilanes. The structures of 5b and 6.MeCN were determined by X-ray crystallography beside their NMR and IR spectroscopic characterization. Compound 5b crystallizes in the monoclinic space group P2/c (Z = 4), 6.MeCN in the orthorhombic space group Pna21 (Z = 4). The structure of 5b reveals a [TDAE].+ radical cation and a 1, 2-Me2Si3Cl7- anion with a pentacoordinated central silicon atom.