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Decamethylcyclopentasiloxane

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Name

Decamethylcyclopentasiloxane

EINECS 208-764-9
CAS No. 541-02-6 Density 0.96 g/cm3
PSA 46.15000 LogP 3.59200
Solubility Immiscible with water. Melting Point -44 °C
Formula C10H30O5 Si5 Boiling Point 210 °C at 760 mmHg
Molecular Weight 370.773 Flash Point 95.6 °C
Transport Information N/A Appearance liquid
Safety 23-24/25 Risk Codes 36/37/38
Molecular Structure Molecular Structure of 541-02-6 (Decamethylcyclopentasiloxane) Hazard Symbols IrritantXi
Synonyms

Cyclopentasiloxane,decamethyl- (6CI,8CI,9CI);Botanisil CP 33;Cyclic dimethylsiloxane pentamer;Cyclo-decamethylpentasiloxane;Cyclopentadimethylsiloxane;Cyclopentasiloxane;DC 345 Fluid;Dow Corning 345 Fluid;Dow Corning 345EU;Execol D5;KF 995;Pentacyclomethicone;SF1202;SH 245 (siloxane);Silbione 70045V5;Silbione V 5;TFS 405;TSF 465;Union Carbide 7158 Silicone Fluid;VS 7158;Volasil 245;VolatileSilicone Fluid 345;Decamethylcyclopentasiloxane;

Article Data 53

Decamethylcyclopentasiloxane 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
ConditionsYield
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
ConditionsYield
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
ConditionsYield
With dimethylsilicon dichloride at 0℃; Further byproducts given;A 79%
B 48%
C 35%
D 5%
1529-17-5

phenyltrimethylsilyl ether

A

541-02-6

decamethylcyclopentasiloxane

B

3440-02-6

dimethyl-diphenoxy-silane

C

18406-79-6

C13H26O3Si3

D

C11H20O2Si2

Conditions
ConditionsYield
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
15576-81-5

diiododimethylsilane

A

556-67-2

octamethylcyclotetrasiloxane

B

541-02-6

decamethylcyclopentasiloxane

Conditions
ConditionsYield
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

541-05-9

Hexamethylcyclotrisiloxane

B

556-67-2

octamethylcyclotetrasiloxane

C

541-02-6

decamethylcyclopentasiloxane

Conditions
ConditionsYield
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
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
ConditionsYield
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;
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
ConditionsYield
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.;;
75-78-5

dimethylsilicon dichloride

A

556-67-2

octamethylcyclotetrasiloxane

B

541-02-6

decamethylcyclopentasiloxane

Conditions
ConditionsYield
With water at 15 - 20℃; Autoclave;A 42%
B 6.7%
512-56-1

trimethyl phosphite

75-78-5

dimethylsilicon dichloride

A

74-87-3

methylene chloride

B

541-02-6

decamethylcyclopentasiloxane

C

540-97-6

dodecamethyl-cyclohexasiloxane

D

1450711-54-2

C7H21O6PSi3

E

1450711-55-3

C9H27O7PSi4

Conditions
ConditionsYield
at 20℃; for 10h; Inert atmosphere;A n/a
B 15%
C 10%
D 38%
E 33%

Decamethylcyclopentasiloxane Consensus Reports

Decamethylcyclopentasiloxane(541-02-6) is reported in EPA TSCA Inventory.

Decamethylcyclopentasiloxane Specification

The Decamethylcyclopentasiloxane, with the cas register number 541-02-6, has its systematic name of 2,2,4,4,6,6,8,8,10,10-decamethyl-1,3,5,7,9,2,4,6,8,10-pentoxapentasilecane. This is a kind of liquid, and incompatible with strong oxidizing agents. And its product categories are various, including siloxanes;organics;si (classes of silicon compounds);si-o compounds;organometallic reagents;organosilicon. As to its usage, it is widely applied in the cosmetic and personal nursing care products.

The characteristics of  Decamethylcyclopentasiloxane are as follows: (1)#H bond acceptors: 5; (2)Polar Surface Area: 46.15; (3)Index of Refraction: 1.427; (4)Molar Refractivity: 98.78 cm3; (5)Molar Volume: 384.3 cm3; (6)Polarizability: 39.16 ×10-24 cm3; (7)Surface Tension: 19 dyne/cm; (8)Density: 0.96 g/cm3; (9)Flash Point: 95.6 °C; (10)Enthalpy of Vaporization: 42.81 kJ/mol; (11)Boiling Point: 210 °C at 760 mmHg; (12)Vapour Pressure: 0.285 mmHg at 25°C; (13)Exact Mass: 370.093957; (14)MonoIsotopic Mass: 370.093957; (15)Topological Polar Surface Area: 46.2; (16)Heavy Atom Count: 20; (17)Complexity: 258.

Use of Decamethylcyclopentasiloxane: Decamethylcyclopentasiloxane reacts with chloro-dimethyl-silane  to produce 1,13-Dihydrotetradecamethylheptasiloxan, with the following condition: reagent: H2O; catalytic agent: SO2; solution: hexane; yield: 45%; other condition: ambient temperature.

Production method of Decamethylcyclopentasiloxane: Diiodo-dimethyl-silane reacts with octamethyl-cyclotetrasiloxane to produce Decamethylcyclopentasiloxane, with the following condition: reagent: pinacolone, Zn; solution: CH2Cl2; reaction time: 10 min; yield: 60%; other condition: ambient temperature.

While dealing with Decamethylcyclopentasiloxane, you should be very cautious. For being a kind of harmful chemical, it may cause damage to health, and it has limited evidence of a carcinogenic effect. Therefore, you had better wear suitable protective clothing while using this chemical and remember not to breathe dust. 

In addition, you could obtain the molecular structure by converting the following datas:
(1)SMILES:O1[Si](O[Si](O[Si](O[Si](O[Si]1(C)C)(C)C)(C)C)(C)C)(C)C;
(2)Std. InChI:InChI=1S/C10H30O5Si5/c1-16(2)11-17(3,4)13-19(7,8)15-20(9,10)14-18(5,6)12-16/h1-10H3 CopyCopied ;
(3)Std. InChIKey:XMSXQFUHVRWGNA-UHFFFAOYSA-N.

Below are the toxicity information of Decamethylcyclopentasiloxane:

Organism Test Type Route Reported Dose (Normalized Dose) Effect Source
rabbit LD50 skin > 16mL/kg (16mL/kg)   Toxicology and Applied Pharmacology. Vol. 28, Pg. 313, 1974.
 
rat LC inhalation > 2700mg/m3/4H (2700mg/m3)   National Technical Information Service. Vol. OTS0572802,
rat LD50 oral > 24134mg/kg (24134mg/kg)   National Technical Information Service. Vol. OTS0572801,

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