Octamethylcyclotetrasiloxane supplier

Name
Octamethylcyclotetrasiloxane
EINECS 209-136-7
CAS No. 556-67-2
Article Data107
CAS DataBase
Density 0.95 g/cm³
Solubility insoluble in water
Melting Point 17-18 °C(lit.)
Formula C₈H₂₄O₄Si₄
Boiling Point 175 °C at 760 mmHg
Molecular Weight 296.618
Flash Point 63.2 °C
Transport Information UN 1993 3/PG 3
Appearance Colorless clear liquid
Safety 36/37-46-51-61
Risk Codes 53-62
Molecular Structure
Hazard Symbols N
Synonyms Dimethylcyclosiloxane;Cyclic dimethylsiloxane tetramer;Dow Corning 244;KF 994;LS 8620;Mirasil CM 4;NSC 345674;NUCSilicone VS 7207;Octamethylcyclotetrasiloxane;DMC;
PSA 36.92000
LogP 2.87360

Synthetic route

: 433725-45-2
2,2,4,4,6,6-hexamethyl-8,8-divinylcyclotetrasiloxane

A: 556-67-2
octamethylcyclotetrasiloxane

B: 541-02-6
decamethylcyclopentasiloxane

C: tetravinyltetramethylcyclotetrasiloxane

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-divinylcyclotetrasiloxane: 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-divinylcyclotetrasiloxane

Conditions

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%

...Expand

: 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

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%

...Expand

: 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

Conditions	Yield
With dimethylsilicon dichloride at 0℃; Further byproducts given;	A 79% B 48% C 35% D 5%

...Expand

: 1529-17-5
phenyltrimethylsilyl ether

A: 556-67-2
octamethylcyclotetrasiloxane

B: 3440-02-6
dimethyl-diphenoxy-silane

C: 18406-79-6
C13H26O3Si3

D: C11H20O2Si2

Conditions

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

...Expand

: 19061-00-8
bis(trimethylsilyl)ketene

A: 541-05-9
Hexamethylcyclotrisiloxane

B: 556-67-2
octamethylcyclotetrasiloxane

C: 1066-54-2
trimethylsilylacetylene

Conditions

Conditions	Yield
at 700℃; flash vacuum pyrolysis;	A 22% B 16% C 76%

...Expand

: 98991-82-3
(trimethylsilyl)(dimethylsilyl)ketene

A: 541-05-9
Hexamethylcyclotrisiloxane

B: 556-67-2
octamethylcyclotetrasiloxane

C: 1066-54-2
trimethylsilylacetylene

Conditions

Conditions	Yield
at 700℃;	A 22% B 16% C 76%

...Expand

: 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

Conditions	Yield
at 400℃;	A 21% B 20% C 73%

...Expand

: 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

Conditions	Yield
at 130℃; for 1h;	A n/a B n/a C 70% D n/a
at 130℃; for 1h;

...Expand

: 75-78-5
dimethylsilicon dichloride

A: 541-05-9
Hexamethylcyclotrisiloxane

B: 556-67-2
octamethylcyclotetrasiloxane

Conditions

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

Conditions	Yield
In benzene at 120℃;	A 48% B 62%

...Expand

: 1113-12-8
diallyl(dimethyl)silane

: 421-85-2
Trifluoromethanesulfonamide

A: 556-67-2
octamethylcyclotetrasiloxane

B: 3,7,9-tris(trifluoromethylsulfonyl)-3,7,9-triazabicyclo[3.3.1]nonane

C: N,N',N''-propane-1,2,3-triyltris(triflamide)

Conditions

Conditions	Yield
With tert-butylhypochlorite; sodium iodide In acetonitrile at -30℃; for 24h; Inert atmosphere; Darkness;	A n/a B 28% C 61%

...Expand

: 15576-81-5
diiododimethylsilane

A: 556-67-2
octamethylcyclotetrasiloxane

B: 541-02-6
decamethylcyclopentasiloxane

Conditions

Conditions	Yield
With 3,3-dimethyl-butan-2-one; zinc In dichloromethane for 0.166667h; Ambient temperature;	A 60% B 18%

: 75-78-5
dimethylsilicon dichloride

A: 556-67-2
octamethylcyclotetrasiloxane

B: 13452-94-3
Tetradecamethylcycloheptasilan

C: 13452-92-1
decamethylcyclopentasilane

D: 4098-30-0
dodecamethylcyclohexasilane

Conditions

Conditions	Yield
With tetrahydrofuran; lithium 0 deg C, 1 h, then 20-25 deg C, 2 h; Further byproducts given. Yields of byproduct given;	A n/a B n/a C 60% D n/a
With tetrahydrofuran; lithium 0 deg C, 1 h, then 20-25 deg C, 2 h; Further byproducts given. Yields of byproduct given;	A n/a B n/a C n/a D 60%
With tetrahydrofuran; lithium at -5 - 0℃; for 1h; Yield given. Further byproducts given. Yields of byproduct given;

...Expand

: 75-78-5
dimethylsilicon dichloride

A: 541-05-9
Hexamethylcyclotrisiloxane

B: 556-67-2
octamethylcyclotetrasiloxane

C: 541-02-6
decamethylcyclopentasiloxane

Conditions

Conditions	Yield
With pyridine; sodium hydrogencarbonate In ethyl acetate at 20℃; for 3h;	A 60% B 20% C 15%
With water Autoclave;	A 51.3% B 29.2% C 8%
With composite catalyst at 150℃; under 675.068 Torr; for 0.5h; Temperature; Pressure; Reagent/catalyst; Large scale;	A n/a B 43% C n/a

...Expand

: 75-78-5
dimethylsilicon dichloride

A: 541-05-9
Hexamethylcyclotrisiloxane

B: 556-67-2
octamethylcyclotetrasiloxane

C: 541-02-6
decamethylcyclopentasiloxane

D: 540-97-6
dodecamethyl-cyclohexasiloxane

Conditions

Conditions	Yield
With dimethyl sulfoxide at 0℃; Further byproducts given;	A 48% B 35% C 12% D 5%
With tetrahydrofuran; lithium at 40 - 45℃; for 1h; Yield given. Further byproducts given. Yields of byproduct given;
With hydrogenchloride In toluene at 20℃; for 4h; Yield given. Further byproducts given. Yields of byproduct given;

...Expand

: 17306-11-5
(allyl)(cyclopentadienyl)dimethylsilane

: 100-52-7
benzaldehyde

A: 541-05-9
Hexamethylcyclotrisiloxane

B: 556-67-2
octamethylcyclotetrasiloxane

C: 7338-50-3
6-phenylfulvene

Conditions

Conditions	Yield
	A n/a B n/a C 47%

...Expand

: 75-78-5
dimethylsilicon dichloride

A: 107-50-6
tetradecamethylcycloheptasiloxane

B: 541-05-9
Hexamethylcyclotrisiloxane

C: 556-67-2
octamethylcyclotetrasiloxane

D: 541-02-6
decamethylcyclopentasiloxane

E: 540-97-6
dodecamethyl-cyclohexasiloxane

Conditions

Conditions	Yield
With H2O In water slow addn. of 4l (CH3)2SiCl2 to 12l H2O at 15-20°C withorous stirring; further products;; distn.;;	A n/a B 0.5% C 42% D 6.7% E 1.6%
With hydrogenchloride In toluene at 20℃; for 4h; Product distribution; diff. concentration of aq. HCl; diff. reaction time; other difunctional organochlorosilanes;
With H2O In diethyl ether; water addn. of (CH3)2SiCl2 to ether-H2O; further products;; distn.;;

...Expand

: 75-78-5
dimethylsilicon dichloride

A: 556-67-2
octamethylcyclotetrasiloxane

B: 541-02-6
decamethylcyclopentasiloxane

Conditions

Conditions	Yield
With water at 15 - 20℃; Autoclave;	A 42% B 6.7%

: 34485-82-0
2,3-dimethyl-3,4-epoxy-1-butene

: 4098-30-0
dodecamethylcyclohexasilane

A: 541-05-9
Hexamethylcyclotrisiloxane

B: 556-67-2
octamethylcyclotetrasiloxane

C: 2,2,4,5-tetramethyl-1-oxa-2-silacyclohex-4-ene

D: 513-81-5
2,3-dimethyl-buta-1,3-diene

Conditions

Conditions	Yield
at 0℃; Irradiation;	A 3% B 4% C 38% D 25%

...Expand

: 681-84-5
tetramethylorthosilicate

: 75-78-5
dimethylsilicon dichloride

A: 2373-51-5
chloro-methylsulfanyl-methane

B: 556-67-2
octamethylcyclotetrasiloxane

C: 84521-21-1
1,1-dimethyltetramethoxydisiloxane

Conditions

Conditions	Yield
With dimethyl sulfoxide at 0℃;	A n/a B n/a C 37%

...Expand

: 930-22-3
epoxybutene

: 4098-30-0
dodecamethylcyclohexasilane

A: 541-05-9
Hexamethylcyclotrisiloxane

B: 556-67-2
octamethylcyclotetrasiloxane

C: 2,2-dimethyl-1-oxa-2-silacyclohex-4-ene

D: 106-99-0
buta-1,3-diene

Conditions

Conditions	Yield
at 0℃; Irradiation;	A 3% B 6% C 15% D 35%

...Expand

: 119-61-9
benzophenone

: 17306-11-5
(allyl)(cyclopentadienyl)dimethylsilane

A: 541-05-9
Hexamethylcyclotrisiloxane

B: 556-67-2
octamethylcyclotetrasiloxane

C: 2175-90-8
6,6-Diphenylfulvene

Conditions

Conditions	Yield
With quartz In benzene at 600℃;	A n/a B n/a C 28%

...Expand

: 78-10-4
tetraethoxy orthosilicate

: 75-78-5
dimethylsilicon dichloride

A: 2373-51-5
chloro-methylsulfanyl-methane

B: 556-67-2
octamethylcyclotetrasiloxane

C: 53201-01-7
1,1-dimethyl-1,3,3,3-tetraethoxydisiloxane

Conditions

Conditions	Yield
With dimethyl sulfoxide at 0℃;	A n/a B n/a C 28%

...Expand

: 3277-26-7
1,1,3,3-Tetramethyldisiloxane

A: 107-50-6
tetradecamethylcycloheptasiloxane

B: 556-67-2
octamethylcyclotetrasiloxane

C: 541-02-6
decamethylcyclopentasiloxane

D: 540-97-6
dodecamethyl-cyclohexasiloxane

Conditions

Conditions	Yield
With iodine In dichloromethane for 0.333333h; Heating; Further byproducts given;	A 14% B 26% C 21% D 15%

...Expand

: 75-77-4
chloro-trimethyl-silane

: 75-78-5
dimethylsilicon dichloride

A: 541-05-9
Hexamethylcyclotrisiloxane

B: 141-62-8
decamethyltetrasiloxane

C: 556-67-2
octamethylcyclotetrasiloxane

D: 141-63-9
dodecamethylpentasiloxane

Conditions

Conditions	Yield
With water In toluene at 20℃; for 27h; Further byproducts given;	A n/a B 22% C n/a D 10 % Chromat.
With water In toluene at 20℃; for 27h; Further byproducts given;	A n/a B 22 % Chromat. C n/a D 10%

...Expand

: 75-77-4
chloro-trimethyl-silane

: 75-78-5
dimethylsilicon dichloride

A: 541-05-9
Hexamethylcyclotrisiloxane

B: 141-62-8
decamethyltetrasiloxane

C: 556-67-2
octamethylcyclotetrasiloxane

D: 107-52-8
tetradecamethylhexasiloxane

Conditions

Conditions	Yield
With water In toluene at 20℃; for 27h; Further byproducts given;	A n/a B 22% C n/a D 6 % Chromat.

...Expand

: 4098-30-0
dodecamethylcyclohexasilane

A: 541-05-9
Hexamethylcyclotrisiloxane

B: 556-67-2
octamethylcyclotetrasiloxane

C: 38041-04-2
octamethylcyclotetrasilane

D: 13452-92-1
decamethylcyclopentasilane

Conditions

Conditions	Yield
With sodium perchlorate In tetrahydrofuran Photolysis;	A 73 % Chromat. B 20% C n/a D n/a

...Expand

: 1-trimethylsilyl-μ3-S,S'-ethylenedithiolatohexacarbonyldiiron

A: 107-46-0
Hexamethyldisiloxane

B: 541-05-9
Hexamethylcyclotrisiloxane

C: 556-67-2
octamethylcyclotetrasiloxane

Conditions

Conditions	Yield
In decane byproducts: H2S; Ar atmosphere; decompn. (165°C, 13 h); GLC, chromato-mass spectroscopy;	A 15% B 15% C 15%

...Expand

: 2943-62-6
1-chloro-1,1,3,3,3-pentamethyldisiloxane

A: 16029-98-4
trimethylsilyl iodide

B: 556-67-2
octamethylcyclotetrasiloxane

C: 18297-87-5
1-chloroheptamethyltrisiloxane

D: 14415-31-7
1-chloro-1,1,3,3,5,5,7,7,7-nonamethyltetrasiloxane

Conditions

Conditions	Yield
With sodium iodide In acetonitrile for 18h; Mechanism; Ambient temperature; other siloxanes; other reagent, var. temp.;	A 14% B 10% C n/a D n/a

...Expand

: 556-67-2
octamethylcyclotetrasiloxane

: 541-05-9
Hexamethylcyclotrisiloxane

Conditions

Conditions	Yield
With aluminium(III) iodide at 140 - 170℃; for 5h;	99%

: 556-67-2
octamethylcyclotetrasiloxane

: 1152310-87-6
1,3-bis(3-azidopropyl)-1,1,3,3-tetramethyldisiloxane

: C50H144N6O21Si22

Conditions

Conditions	Yield
With trifluorormethanesulfonic acid at 60℃; for 13h;	98%

: 3277-26-7
1,1,3,3-Tetramethyldisiloxane

: 556-67-2
octamethylcyclotetrasiloxane

: 16881-77-9
(dimethoxy)methylsilane

: C12H29N9O4Si3

: C110H323N9O51Si52

Conditions

Conditions	Yield
With trifluorormethanesulfonic acid at 20 - 60℃; for 15.25h;	95%

...Expand

: 107-46-0
Hexamethyldisiloxane

: 556-67-2
octamethylcyclotetrasiloxane

polyhydridomethylsiloxane: polyhydridomethylsiloxane

hydridomethyldimethylsiloxane copolymer: hydridomethyldimethylsiloxane copolymer

Conditions

Conditions	Yield
With China clay; sulfuric acid at 100℃; for 120h;	94.3%

...Expand

: 3277-26-7
1,1,3,3-Tetramethyldisiloxane

: 556-67-2
octamethylcyclotetrasiloxane

: C4H11N3O2Si

: C48H143N3O22Si23

Conditions

Conditions	Yield
With trifluorormethanesulfonic acid at 20 - 60℃; for 15.25h;	94%

...Expand

: 3277-26-7
1,1,3,3-Tetramethyldisiloxane

: 556-67-2
octamethylcyclotetrasiloxane

: 995-82-4
1,1,3,3,5,5,7,7,9,9,11,11-dodecamethylhexasiloxane

Conditions

Conditions	Yield
With Kg-23 catalyst at 80℃; for 12h; Inert atmosphere;	93%
With potassium hydroxide In water; toluene at 50℃; for 2h;	72.9%
With sulfuric acid
With trimethylsilyl trifluoromethanesulfonate for 24h;

: 556-67-2
octamethylcyclotetrasiloxane

: 2052-49-5
tetra(n-butyl)ammonium hydroxide

: C16H36N(1+)*C6H19O4Si3(1-)

Conditions

Conditions	Yield
In methanol	92%

: 556-67-2
octamethylcyclotetrasiloxane

: 865-37-2
dimethylaluminum hydride

: 254763-44-5
(CH3)2Si((OAl(CH3)2)2Si(CH3)2H)2

Conditions

Conditions	Yield
In hexane stirring (4 d); distn. (vac.);	90%

: 556-67-2
octamethylcyclotetrasiloxane

: 75-24-1
trimethylaluminum

: ((CH3)2Al(OSi(CH3)3))2

Conditions

Conditions	Yield
mixed in a quarts tube; heated to 180°C for 24 h; pressure (28 psig); purified by vac. distillation; recrystd. (cold pentane, or vac. sublimation); elem. anal.;	90%

: 556-67-2
octamethylcyclotetrasiloxane

: 1,5-disodiumoxyhexamethyltrisiloxane

Conditions

Conditions	Yield
With sodium hydroxide In methanol for 4h; Time; Reflux;	90%

: 556-67-2
octamethylcyclotetrasiloxane

: 1152310-87-6
1,3-bis(3-azidopropyl)-1,1,3,3-tetramethyldisiloxane

: C30H84N6O11Si12

Conditions

Conditions	Yield
With trifluorormethanesulfonic acid at 60℃; for 13h;	90%

: 2627-95-4
tetramethyldivinyldisiloxane

: 556-67-2
octamethylcyclotetrasiloxane

Polymer, Mn 580; Monomer(s): 1,3-divinyl-1,1,3,3-tetramethyldivinylsiloxane; octamethylcyclotetrasiloxane: Polymer, Mn 580; Monomer(s): 1,3-divinyl-1,1,3,3-tetramethyldivinylsiloxane; octamethylcyclotetrasiloxane

Conditions

Conditions	Yield
With sulfuric acid at 20℃; for 4h;	89%

: 3277-26-7
1,1,3,3-Tetramethyldisiloxane

: 556-67-2
octamethylcyclotetrasiloxane

: 33006-95-0
C20H62O9Si10

Conditions

Conditions	Yield
With Kg-23 catalyst In toluene at 80℃; for 12h; Inert atmosphere;	86%
With sulfuric acid
With trimethylsilyl trifluoromethanesulfonate for 24h;

: 556-67-2
octamethylcyclotetrasiloxane

: 88351-31-9
(E)-But-2-enedioic acid mono-(3-{3-[3-((E)-3-carboxy-acryloyloxy)-propyl]-1,1,3,3-tetramethyl-disiloxanyl}-propyl) ester

: C34H78O17Si10

Conditions

Conditions	Yield
With KU-23 ion-exchange resin at 90℃; for 7h;	86%

: 556-67-2
octamethylcyclotetrasiloxane

A: 16029-98-4
trimethylsilyl iodide

B: 107-46-0
Hexamethyldisiloxane

C: 74-88-4
methyl iodide

Conditions

Conditions	Yield
With aluminium(III) iodide at 140 - 170℃; for 5h;	A n/a B 83.5% C n/a

...Expand

: 556-67-2
octamethylcyclotetrasiloxane

: 2554-06-5
2,4,6,8-tetramethyl-2,4,6,8-tetravinyl-cyclotetrasiloxane

: 18395-32-9
2-vinyl-2,4,4,6,6-pentamethylcyclotrisiloxane

Conditions

Conditions	Yield
With triphenylphosphine; potassium hydroxide at 95 - 145℃; for 2h; Temperature; Concentration; Reagent/catalyst; Autoclave;	83.4%

: 556-67-2
octamethylcyclotetrasiloxane

: 18132-72-4
1,3-bis<3-chloropropyl>-1,1,3,3-tetramethyldisiloxane

: α,ω-bis-(chloropropyl)-pentadimethylsiloxane

Conditions

Conditions	Yield
Purolite CT-175 at 100℃; for 17h;	83%

: 556-67-2
octamethylcyclotetrasiloxane

: 88351-31-9
(E)-But-2-enedioic acid mono-(3-{3-[3-((E)-3-carboxy-acryloyloxy)-propyl]-1,1,3,3-tetramethyl-disiloxanyl}-propyl) ester

: C26H54O13Si6

Conditions

Conditions	Yield
With KU-23 ion-exchange resin at 90℃; for 7h;	82%

: 556-67-2
octamethylcyclotetrasiloxane

: 70877-11-1
bis<4-(methacryloyloxy)butyl>tetramethyldisiloxane

: C60H158O25Si22

Conditions

Conditions	Yield
With trifluorormethanesulfonic acid In chloroform at 25℃; for 24h;	82%

: 556-67-2
octamethylcyclotetrasiloxane

: 1,3-bis(3-(acryloxymethyl)phenylethyl)tetramethyldisiloxane

: C68H158O25Si22

Conditions

Conditions	Yield
With trifluorormethanesulfonic acid In chloroform at 25℃; for 24h;	81.1%

: 18001-60-0
1,1,3,3-tetraethoxy-1,3-dimethyldisiloxane

: 556-67-2
octamethylcyclotetrasiloxane

: 1,3,3,5-tetramethyl-1,1,5,5-tetraethoxytrisiloxane

Conditions

Conditions	Yield
With potassium hydroxide at 145℃;	81%

: 1066-35-9
dimethylmonochlorosilane

: 556-67-2
octamethylcyclotetrasiloxane

: 995-82-4
1,1,3,3,5,5,7,7,9,9,11,11-dodecamethylhexasiloxane

Conditions

Conditions	Yield
With water; sulfur dioxide Ambient temperature;	78%

: 556-67-2
octamethylcyclotetrasiloxane

: 1152310-87-6
1,3-bis(3-azidopropyl)-1,1,3,3-tetramethyldisiloxane

: C3H14O4Si3

: C105H310N6O49Si50

Conditions

Conditions	Yield
With trifluorormethanesulfonic acid at 20 - 80℃; for 20.25h;	77%

...Expand

Octamethylcyclotetrasiloxane Chemical Properties

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

Octamethylcyclotetrasiloxane Uses

Octamethylcyclotetrasiloxane (CAS NO.556-67-2) is commonly used as raw materials of organic silicon, also used in the electronics industry.

Octamethylcyclotetrasiloxane 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.

Octamethylcyclotetrasiloxane Consensus Reports

Reported in EPA TSCA Inventory.

Octamethylcyclotetrasiloxane Safety Profile

A skin irritant. When heated to decomposition it emits acrid smoke and irritating vapors.
Hazard Codes: XiXnFN
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

Product Name

Octamethylcyclotetrasiloxane

Synthetic route

Octamethylcyclotetrasiloxane Chemical Properties

Octamethylcyclotetrasiloxane Uses

Octamethylcyclotetrasiloxane Toxicity Data With Reference

Octamethylcyclotetrasiloxane Consensus Reports

Octamethylcyclotetrasiloxane Safety Profile

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