2474-02-4

Basic information

• Product Name: 1,7-DICHLOROOCTAMETHYLTETRASILOXANE
• Synonyms: 1,7-DICHLOROOCTAMETHYLTETRASILOXANE;1,7-dichloro-1,1,3,3,5,5,7,7-octamethyl-tetrasiloxan;1,7-Dichloro-1,1,3,3,5,5,7,7-octamethyltetrasiloxane;1,7-dichloro-1,1,3,3,5,5,7,7-octamethyl-Tetrasiloxane;Tetrasiloxane, 1,7-dichloro-1,1,3,3,5,5,7,7-octamethyl-;1,3-dichlorooctamethyltetrasiloxane;1,7-Dichloro-1,1,3,3,5,5,7,7-octamethyl-2,4,6-trioxaheptasilane;1,7-Dichloro-1,1,3,3,5,5,7,7-octamethylheptanetetrasiloxane
• CAS NO: 2474-02-4
• Molecular Formula: C₈H₂₄Cl₂O₃Si₄
• Molecular Weight: 351.52
• EINECS: 219-597-6
• Product Categories: Organometallic Reagents;Organosilicon;Siloxanes;Chemical Synthesis;Organometallic Reagents
• Mol File: 2474-02-4.mol
• Article Data: 6

Chemical Properties

• Melting Point: −62 °C(lit.)
• Boiling Point: 222 °C(lit.)
• Flash Point: 190 °F
• Appearance: /liquid
• Density: 1.011 g/mL at 25 °C(lit.)
• Vapor Pressure: 0.0421mmHg at 25°C
• Refractive Index: n20/D 1.405(lit.)
• BRN: 1784800
• CAS DataBase Reference: 1,7-DICHLOROOCTAMETHYLTETRASILOXANE(CAS DataBase Reference)
• NIST Chemistry Reference: 1,7-DICHLOROOCTAMETHYLTETRASILOXANE(2474-02-4)
• EPA Substance Registry System: 1,7-DICHLOROOCTAMETHYLTETRASILOXANE(2474-02-4)

Safety Data

• Hazard Codes: C
• Statements: 34
• Safety Statements: 26-36/37/39-45
• RIDADR: UN 2987 8/PG 2
• WGK Germany: 3
• F: 10-21
• TSCA: Yes
• HazardClass: 8
• PackingGroup: II
• Hazardous Substances Data: 2474-02-4(Hazardous Substances Data)

Usage

General Description

1,7-Dichlorooctamethyltetrasiloxane is a chemical compound with the molecular formula C8H24Cl2O2Si4. It is a highly volatile and flammable liquid that is insoluble in water but soluble in organic solvents. This chemical is commonly used as a surfactant, emulsifier, and dispersant in various industrial and consumer products. It is also used in the production of silicone-based polymers and elastomers, as well as in the manufacturing of personal care products, pharmaceuticals, and agricultural chemicals. 1,7-Dichlorooctamethyltetrasiloxane is classified as a hazardous substance and should be handled with caution due to its potential health and environmental risks.

InChI:InChI=1/C8H24Cl2O3Si4/c1-14(2,9)11-16(5,6)13-17(7,8)12-15(3,4)10/h1-8H3

Upstream product

• 75-78-5 dimethylsilicon dichloride 
• 1066-35-9 dimethylmonochlorosilane 
• 556-67-2 octamethylcyclotetrasiloxane 
• 1000-05-1 1,1,3,3,5,5,7,7-octamethyltetrasiloxane 
• 2401-73-2 1,1,3,3-tetramethyl-1,3-dichlorodisiloxane 
• 14741-59-4 1,9-dichlorodecamethylpentasiloxane 
• 4301-14-8 acetylenemagnesium bromide 
• 1825-69-0 dimethyl chloro ethoxy silane 
• 75-36-5 acetyl chloride 

Downstream Products

• 1000-05-1 1,1,3,3,5,5,7,7-octamethyltetrasiloxane 
• 18547-28-9 1,7-Dibutyloxy-octamethyl-tetrasiloxan 
• 141613-69-6 (C₆H₅BO)((CH₃)2SiO)4 
• 58434-69-8 N-phenyl-1,1,3,3,5,5,7,7-octamethyl-1,3,5,7-tetrasila-2-aza-4,6,8-trioxacyclooctane 
• 17909-28-3 1,11-bis-chloromethyl-1,1,3,3,5,5,7,7,9,9,11,11-dodecamethyl-hexasiloxane 
• 3081-07-0 1,1,3,3,5,5,7,7-octamethyltetrasiloxane-1,7-diol 

Relevant articles and documents

Building blocks for oligomeric siloxanes –selective chlorination of hydrido-siloxanes

A new method was developed to achieve highly selective monochlorination of α,ω-dihydridosiloxanes, ((H)Me2SiO-(SiMe2O)n-SiMe2(H), n = 0–2; (H)R2Si–O-SiR2(H); R = Me, iPr, Ph; 3,5-dihydridooctamethyltetrasiloxane, Me3SiO-(Si(H)MeO)2–SiMe3) with trichloroisocyanuric acid (TCCA). The dependence of the selectivity of the monochlorination on the siloxane chain length is also discussed.

POLYARYLACETYLENES CONTAINING SILOXANE, SILANE, AND CARBORANE MOIETIES

Disclosed herein are the compounds shown below. Each R is an organic group, Cb is a carborane group, and —C6H4— is phenylene. The value of each m is a nonnegative integer, q is 0 or 1, with the proviso that if q is 0 then m is 0 or 1, p is a positive integer, r is a positive integer, and n is an integer greater than or equal to 10. Also disclosed are methods of making and crosslinking the compounds. [in-line-formulae]—{SiR2—([O]q—SiR2)m-[Cb-SiR2—([O]q—SiR2)m]p—C≡C—C6H4—C≡C}—[/in-line-formulae] [in-line-formulae]—{SiR2—(O—SiR2)m—C≡C—C6H4—C≡C}n—;[/in-line-formulae] [in-line-formulae]—{SiR2—([O]q—SiR2)m—[C≡C—C6H4—C≡C—SiR2—([O]q—SiR2)m]p-Cb-[SiR2—([O]q—SiR2)m-Cb]r}-[/in-line-formulae]

REACTION OF OCTAMETHYLCYCLOTETRASILOXANE AND PERMETHYLOLIGOSILOXANES WITH ACYL CHLORIDES IN THE PRESENCE OF CoCl2

Octamethylcyclotetrasiloxane is cleaved quantitatively by acetyl chloride (1:1 molar ratio) in the presence of anhydrous CoCl2 in acetonitrile at room temperature to form primarily α-chloro-ω-acetoxyoligodimethylsiloxanes nOCOCH3 (n = 0-3; yield, 60-65percent)>.In the presence of an equimolar amount of trimethylacetoxysilane of hexamethyldisiloxane, the major reaction products are α-methyl-ω-acetoxyoligodimethylsiloxanes nOCOCH3 (n = 4-6; yield, 65-70percent)>.