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| CAS No.: | 556-67-2 |
|---|---|
| Name: | Octamethylcyclotetrasiloxane |
| Molecular Structure: | |
|
|
|
| Formula: | C8H24O4Si4 |
| Molecular Weight: | 296.618 |
| Synonyms: | Dimethylcyclosiloxane;Cyclic dimethylsiloxane tetramer;Dow Corning 244;KF 994;LS 8620;Mirasil CM 4;NSC 345674;NUCSilicone VS 7207;Octamethylcyclotetrasiloxane;DMC; |
| EINECS: | 209-136-7 |
| Density: | 0.95 g/cm3 |
| Melting Point: | 17-18 °C(lit.) |
| Boiling Point: | 175 °C at 760 mmHg |
| Flash Point: | 63.2 °C |
| Solubility: | insoluble in water |
| Appearance: | Colorless clear liquid |
| Hazard Symbols: |
 N
|
| Risk Codes: | 53-62 |
| Safety: | 36/37-46-51-61 |
| Transport Information: | UN 1993 3/PG 3 |
| PSA: | 36.92000 |
| LogP: | 2.87360 |
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- 433725-45-2
2,2,4,4,6,6-hexamethyl-8,8-divinylcyclotetrasiloxane
A
- 556-67-2
octamethylcyclotetrasiloxane
B
- 541-02-6
decamethylcyclopentasiloxane
D
copoly(dimethylsiloxane/divinylsiloxane), prepared by anionic polymerization of 2,2,4,4,6,6-hexamethyl-8,8-divinylcyclotetrasiloxane; monomer(s): 2,2,4,4,6,6-hexamethyl-8,8-divinylcyclotetrasiloxanecopoly(dimethylsiloxane/divinylsiloxane), prepared by anionic polymerization of 2,2,4,4,6,6-hexamethyl-8,8-divinylcyclotetrasiloxane; monomer(s): 2,2,4,4,6,6-hexamethyl-8,8-divinylcyclotetrasiloxane
| Conditions | Yield |
|---|---|
| With P4-t-Bu at 80℃; for 0.333333h; Further byproducts given; | A n/a B n/a C n/a D 80% |
- 67-68-5
dimethyl sulfoxide
- 75-78-5
dimethylsilicon dichloride
A
- 2373-51-5
chloro-methylsulfanyl-methane
B
- 541-05-9
Hexamethylcyclotrisiloxane
C
- 556-67-2
octamethylcyclotetrasiloxane
D
- 541-02-6
decamethylcyclopentasiloxane
E
- 540-97-6
dodecamethyl-cyclohexasiloxane
| Conditions | Yield |
|---|---|
| at 0℃; Mechanism; other diorganyldichlorosilanes; reactions in the presence of hexamethyldisiloxane, trimethylchlorosilane, tetramethoxysilane, tetraethoxysilane; | A 79% B 48% C 35% D 12% E 5% |
- 67-68-5
dimethyl sulfoxide
A
- 2373-51-5
chloro-methylsulfanyl-methane
B
- 541-05-9
Hexamethylcyclotrisiloxane
C
- 556-67-2
octamethylcyclotetrasiloxane
D
- 541-02-6
decamethylcyclopentasiloxane
| Conditions | Yield |
|---|---|
| With dimethylsilicon dichloride at 0℃; Further byproducts given; | A 79% B 48% C 35% D 5% |
- 1529-17-5
phenyltrimethylsilyl ether
A
- 556-67-2
octamethylcyclotetrasiloxane
B
- 3440-02-6
dimethyl-diphenoxy-silane
C
- 18406-79-6
C13H26O3Si3
| Conditions | Yield |
|---|---|
| With gallium(III) iodide at 175 - 180℃; for 3h; Yield given; Further byproducts given. Title compound not separated from byproducts; | A n/a B 79% C n/a D n/a |
- 19061-00-8
bis(trimethylsilyl)ketene
A
- 541-05-9
Hexamethylcyclotrisiloxane
B
- 556-67-2
octamethylcyclotetrasiloxane
C
- 1066-54-2
trimethylsilylacetylene
| Conditions | Yield |
|---|---|
| at 700℃; flash vacuum pyrolysis; | A 22% B 16% C 76% |
- 98991-82-3
(trimethylsilyl)(dimethylsilyl)ketene
A
- 541-05-9
Hexamethylcyclotrisiloxane
B
- 556-67-2
octamethylcyclotetrasiloxane
C
- 1066-54-2
trimethylsilylacetylene
| Conditions | Yield |
|---|---|
| at 700℃; | A 22% B 16% C 76% |
- 87594-05-6
1-(1-Adamantyl)-2-diazo-2-(pentamethyldisilanyl)ethanone
A
- 541-05-9
Hexamethylcyclotrisiloxane
B
- 556-67-2
octamethylcyclotetrasiloxane
C
- 82094-48-2
1-(trimethylsilylethynyl)adamantane
| Conditions | Yield |
|---|---|
| at 400℃; | A 21% B 20% C 73% |
- 52826-45-6
(benzylimino)triphenylphosphorane
- 65181-02-4
3,3-dimethyl-6-oxa-3-silabicyclo<3.1.0>hexane
A
- 541-05-9
Hexamethylcyclotrisiloxane
B
- 556-67-2
octamethylcyclotetrasiloxane
C
- 113017-78-0
2,2,4,4-tetramethyl-6-vinyl-1,3-dioxa-2,4-disilacyclohexane
D
- 106-99-0
buta-1,3-diene
| Conditions | Yield |
|---|---|
| at 130℃; for 1h; | A n/a B n/a C 70% D n/a |
| at 130℃; for 1h; |
- 75-78-5
dimethylsilicon dichloride
A
- 541-05-9
Hexamethylcyclotrisiloxane
B
- 556-67-2
octamethylcyclotetrasiloxane
| Conditions | Yield |
|---|---|
| With water Autoclave; | A 63.7% B 27.2% |
| With water In toluene at 20℃; for 27h; | A 17 % Chromat. B 38% |
| With water Autoclave; | A 15.9% B 17.4% |
| With water In toluene at 20℃; for 27h; | A 4% B 44 % Chromat. |
| With tetrabutylammonium tetrafluoroborate; oxygen In tetrahydrofuran Product distribution; Further Variations:; Reagents; amount of electricity; type of electrolysis cell; Electrochemical reaction; |
- 541-05-9
Hexamethylcyclotrisiloxane
- 88703-87-1
1,2-silaoxetene 2,2-dimethyl-3-(trimethylsilyl)-4-adamantyl-1-oxa-2-silacyclobutene
A
- 556-67-2
octamethylcyclotetrasiloxane
B
- 82094-48-2
1-(trimethylsilylethynyl)adamantane
| Conditions | Yield |
|---|---|
| In benzene at 120℃; | A 48% B 62% |
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Chemistry
The Molecular Structure of Octamethylcyclotetrasiloxane (CAS NO.556-67-2):
Empirical Formula: C8H24O4Si4
Molecular Weight: 296.6158
Nominal Mass: 296 Da
Average Mass: 296.6158 Da
Monoisotopic Mass: 296.075163 Da
Index of Refraction: 1.423
Molar Refractivity: 79.02 cm3
Molar Volume: 310 cm3
Surface Tension: 18.4 dyne/cm
Density: 0.95 g/cm3
Flash Point: 63.2 °C
Enthalpy of Vaporization: 39.44 kJ/mol
Boiling Point: 175 °C at 760 mmHg
Vapour Pressure: 1.57 mmHg at 25°C
Appearance: Colorless to brown liquid
IUPAC Name: 2,2,4,4,6,6,8,8-octamethyl-1,3,5,7,2,4,6,8-tetraoxatetrasilocane
Product Categories: Chloro;Silicon Compounds;Organics;Dichlorosilanes;Dichlorosilanes (for Polysilanes);Functional Materials;Reagent for High-Performance Polymer Research;Si (Classes of Silicon Compounds);Si-Cl Compounds;Silicon Compounds (for Synthesis);Synthetic Organic Chemistry;Chloro Silanes
Storage temp: Store at 0-5°C
Water Solubility: reacts
Sensitive: Moisture Sensitive
Stability: Stable. Reacts violently with water and alcohols. Highly flammable. Incompatible with strong oxidizing agents, water, alcohols, caustics, ammonia
Uses
Octamethylcyclotetrasiloxane (CAS NO.556-67-2) is commonly used as raw materials of organic silicon, also used in the electronics industry.
Toxicity Data With Reference
| 1. | skn-rbt 500 mg/24H MLD | 85JCAE Prehled Prumyslove Toxikologie; Organicke Latky Marhold, J.,Prague, Czechoslovakia.: Avicenum,1986,1230. | ||
| 2. | eye-rbt 500 mg/24H MLD | 85JCAE Prehled Prumyslove Toxikologie; Organicke Latky Marhold, J.,Prague, Czechoslovakia.: Avicenum,1986,1230. |
Consensus Reports
Reported in EPA TSCA Inventory.
Safety Profile
A skin irritant. When heated to decomposition it emits acrid smoke and irritating vapors.
Hazard Codes: 
XiXn
F
N
Risk Statements: 20-59-36/37/38-11-67-65-63-48/20-38-20/21-50/53
R20: Harmful by inhalation
R59: Dangerous to the ozone layer
R36/37/38: Irritating to eyes, respiratory system and skin
R11: Highly flammable
R67: Vapours may cause drowsiness and dizziness
R65: Harmful: may cause lung damage if swallowed
R63: Possible risk of harm to the unborn child
R38: Irritating to skin
R20/21: Harmful by inhalation and in contact with skin
R50/53: Very toxic to aquatic organisms, may cause long-term adverse effects in the aquatic environment
Safety Statements: 60-61-62-36/37-59
S60: This material and its container must be disposed of as hazardous waste
S61: Avoid release to the environment. Refer to special instructions / safety data sheets
S62: If swallowed, do not induce vomitting; seek medical advice immediately and show this container or label
S36/37: Wear suitable protective clothing and gloves
S59: Refer to manufacturer / supplier for information on recovery / recycling
RIDADR: UN 2924 3/PG 2
WGK Germany: 3
F: 3-10-19-21
TSCA: Yes
HazardClass: 3
PackingGroup: II
HS Code: 29310095