4040-74-8

Basic information

• Product Name: CYCLOPENTAMETHYLENEDIMETHYLSILANE
• Synonyms: 1,1-Dimethyl-1-silacyclohexane;1,1-dimethyl-silacyclohexan;1,1-Dimethylsilacyclohexane;1,1-dimethyl-Silacyclohexane;1,1-Dimethylsilinane;Dimethylsilacyclohexane;CYCLOPENTAMETHYLENEDIMETHYLSILANE
• CAS NO: 4040-74-8
• Molecular Formula: C₇H₁₆Si
• Molecular Weight: 128.29
• EINECS: 223-730-3
• Mol File: 4040-74-8.mol
• Article Data: 7

Chemical Properties

• Melting Point: 131.0-131.2 °C
• Boiling Point: 132 °C
• Flash Point: 30°C
• Appearance: /
• Density: 0.804
• Vapor Pressure: 10.2mmHg at 25°C
• Refractive Index: 1.4394
• CAS DataBase Reference: CYCLOPENTAMETHYLENEDIMETHYLSILANE(CAS DataBase Reference)
• NIST Chemistry Reference: CYCLOPENTAMETHYLENEDIMETHYLSILANE(4040-74-8)
• EPA Substance Registry System: CYCLOPENTAMETHYLENEDIMETHYLSILANE(4040-74-8)

Safety Data

• Statements: 10
• Safety Statements: 16
• RIDADR: 1993
• TSCA: Yes
• Hazardous Substances Data: 4040-74-8(Hazardous Substances Data)

Usage

General Description

CYCLOPENTAMETHYLENEDIMETHYLSILANE is an organosilicon compound with the chemical formula C8H18Si. It is a colorless liquid with a strong garlic-like odor. This chemical is primarily used as a crosslinking agent in the production of silicone rubber, where it functions to increase the polymer network density and improve the mechanical properties of the final material. It is also used as a raw material in the synthesis of various silicone-based products, such as adhesives, sealants, and coatings. Additionally, CYCLOPENTAMETHYLENEDIMETHYLSILANE has recently been investigated for its potential as a precursor in the fabrication of silicon-based nanomaterials for use in advanced electronic and optoelectronic devices.

InChI:InChI=1/C7H16Si/c1-8(2)6-4-3-5-7-8/h3-7H2,1-2H3

Upstream product

• 33932-65-9 dimethyl(pent-4-en-1-yl)silane 
• 1112-39-6 dimethyldimethoxysilan 
• 23708-48-7 pentamethylenebis(magnesium bromide) 
• 2406-34-0 1,1-dichloro-1-silacyclohexane 
• 3944-19-2 1-chloromethyl-1-methyl-1-silacyclopentane 
• 30090-51-8 4-penten-1-ylmagnesium chloride 
• 1119-51-3 bromopentene 
• 628-76-2 1,5-dichloropentane 
• 75-78-5 dimethylsilicon dichloride 
• 75-16-1 methylmagnesium bromide 
• 119914-32-8 (5-bromopentyl)chlorodimethylsilane 
• 111-24-0 1,5-dibromo-pentane 
• 78957-27-4 6-bromo-3,3-dimethyl-3-sila-5-hexene 
• 104107-85-9 6-chloro-4,4-dimethyl-4-sila-1-hexene 

Downstream Products

• 519-73-3 triphenylmethane 
• 55549-96-7 4-Pentenyl-dimethylfluorsilan 

Relevant articles and documents

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METHOD FOR PRODUCING SILACYCLO MATERIALS

A method for producing silacycloalkanes by reacting an alkoxysilanc, R1ySi(OR2)4-y with a Grignard reagent, XMgR3MgX where each R1 is independently an alkyl group having 1 to 4 carbon atoms, an alkenyl group having 2 to 4 carbon atoms, a hydrogen atom, or CF3 each R2 is independently an alkyl group having 1 to 4 carbon atoms; y has a value of 1 or 2; R3 is selected from an alkylene group having 1 to 10 carbon atoms; and X is a halogen.

Electrochemical synthesis of cyclic alkylsilanes

The electrochemical reduction of aliphatic α,ω-dibromides in the presence of polychlorosilanes of the formula RnSiCl(4-n) (n=0, 2) was shown to afford heterocyclic silicon compounds in good yield (up to 91percent).In contrast to non-electrochemical methods of synthesis of silacycloalkanes, based on the ring closure of terminal unsaturated compounds, the electrochemical route does not produce α-methylated byproducts and the heterocycle formation occurs quite selectively.The yield of cyclic organosilicon compounds goes through a maximum for 1,1-dimethyl-1-silacyclopentane (91percent) and roughly decreases for 1,1-dimethyl-1-silacyclobutane (18percent) and 1,1-dimethyl-1-sialacycloheptane (57percent).The formation of 5-silaspiro nonane by the electrochemical process occurs with high selectivity despite the multitude of possible reaction pathways and the high probability of polymer formation due to the high functionality of the silicon.The relatively high selectivity of the electrochemical ring closure is suggested to be due to the orientating effect of an electrode in the course of an irreversible reduction of a C-Hal bond in the monosilylated intermediate.A possible mechanism for the process is discussed.Keywords: Silicon; Electrochemistry; Electrochemical synthesis