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Octamethylcyclotetrasiloxane

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Octamethylcyclotetrasiloxane Basic information

Product Name:
Octamethylcyclotetrasiloxane
Synonyms:
  • JACS-556-67-2
  • uc7207
  • unioncarbide7207
  • vs7207
  • Octamethylcyclotetrasiloxane,98%
  • 1H-Benzimidazol-2-yl-carbamic Acid Methyl Ester-d4
  • 2-Benzimidazolecarbamic Acid Methyl Ester-d4
  • BAS-3460-d4
CAS:
556-67-2
MF:
C8H24O4Si4
MW:
296.62
EINECS:
209-136-7
Product Categories:
  • Organics
  • Silicon Compounds
  • Siloxanes
  • Silicone Series
  • Self Assembly&Contact Printing
  • Self-Assembly Materials
  • Si (Classes of Silicon Compounds)
  • Si-O Compounds
  • Intermediates & Fine Chemicals
  • Isotope Labeled Compounds
  • Pharmaceuticals
  • Organometallic Reagents
  • Organosilicon
  • SilanesOrganometallic Reagents
  • Chemical Synthesis
  • Contact Printing
  • Materials Science
  • Micro/NanoElectronics
  • Organometallic Reagents
  • Self Assembly &amp
  • Self-Assembly Materials
  • Silanes
Mol File:
556-67-2.mol
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Octamethylcyclotetrasiloxane Chemical Properties

Melting point:
17-18 °C (lit.)
Boiling point:
175-176 °C (lit.)
Density 
0.956 g/mL at 25 °C (lit.)
vapor density 
1 (vs air)
refractive index 
n20/D 1.396(lit.)
Flash point:
140 °F
storage temp. 
Store below +30°C.
solubility 
<0.001g/l Hydrolysis
form 
liquid
Specific Gravity
0.956
color 
colorless
explosive limit
0.4-11.7%(V)
Water Solubility 
INSOLUBLE
Sensitive 
Moisture Sensitive
Merck 
14,6747
BRN 
1787074
InChIKey
HMMGMWAXVFQUOA-UHFFFAOYSA-N
CAS DataBase Reference
556-67-2(CAS DataBase Reference)
NIST Chemistry Reference
Cyclotetrasiloxane, octamethyl-(556-67-2)
EPA Substance Registry System
Octamethylcyclotetrasiloxane (556-67-2)
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Safety Information

Hazard Codes 
Xn
Risk Statements 
53-62-10
Safety Statements 
36/37-46-51-61
RIDADR 
UN 1993 3/PG 3
WGK Germany 
1
RTECS 
GZ4397000
TSCA 
Yes
HazardClass 
3
PackingGroup 
III
HS Code 
29319090
Hazardous Substances Data
556-67-2(Hazardous Substances Data)
Toxicity
LD50 oral in rat: 1540mg/kg

MSDS

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Octamethylcyclotetrasiloxane Usage And Synthesis

Chemical Properties

Colorless clear liquid

Uses

Preparation of methyl silicon oils.

Uses

Polydimethylsiloxane by the Polymerization of Octamethylcyclotetrasiloxane: To a resin flask equipped with a thermometer, stirrer, and reflux eondenser is added 1000 gm of octamethylcyclotetrasiloxane. The siloxane is heated to 165°C, and then 0.14gm of a potassium hydroxide-isopropanol complex (neutral equivalent = 193.5) is added to give a Si : Κ ratio of 4470:1. In 25 min the stirrer begins to stall, and the polymer is now heated for 3(1/2) hr at 150°C to complete polymerization. The resulting polymer has an intrinsic viscosity of 1.5 dl/gm corresponding to a molecular weight of 804,600.

Uses

Fungicide

Definition

ChEBI: A cyclosiloxane that is the octamethyl derivative of cyclotetrasiloxane.

Safety Profile

A skin irritant. When heated todecomposition it emits acrid smoke and irritating vapors.

Purification Methods

The solid exists in two forms, m 16.30o and 17.65o. Dry it over CaH2 and distil it. Further fractionation can be effected by repeated partial freezing and discarding the liquid phase. [Osthoff & Grubb J Am Chem Soc 76 399 1954, Hoffman J Am Chem Soc 75 6313 1953, Beilstein 4 IV 4125.]

OctamethylcyclotetrasiloxaneSupplier

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