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107-51-7

Basic Information
CAS No.: 107-51-7
Name: POLY(DIMETHYLSILOXANE), HYDROXY TERMINATED
Article Data: 54
Molecular Structure:
Molecular Structure of 107-51-7 (POLY(DIMETHYLSILOXANE), HYDROXY TERMINATED)
Formula: C8H24O2Si3
Molecular Weight: 236.534
Synonyms: Trisiloxane,octamethyl- (6CI,8CI,9CI);1,1,1,3,3,5,5,5-Octamethyltrisiloxane;Dimethylbis(trimethylsiloxy)silane;FRD 20;KF 96A1cs;KF 96L1.0;OS 20;OS 20(siloxane);Octamethyltrisiloxane;Pentamethyl(trimethylsiloxy)disiloxane;Pentamethyl(trimethylsilyloxy)disiloxane;
EINECS: 203-497-4
Density: 0.843 g/cm3
Melting Point: -82 °C
Boiling Point: 152.999 °C at 760 mmHg
Flash Point: 55.016 °C
Solubility: 34μg/L at 23℃
Appearance: clear colourless liquid
Risk Codes: 10
Safety: 23-24/25
Transport Information: UN 1993
PSA: 18.46000
LogP: 3.39120
Synthetic route
75-77-4

chloro-trimethyl-silane

18090-13-6, 52698-97-2, 111930-73-5

sodium dimethylsiloxanediolate

107-51-7

Octamethyltrisiloxane

Conditions
ConditionsYield
In hexane at -40 - -30℃;100%
107-46-0

Hexamethyldisiloxane

75-78-5

dimethylsilicon dichloride

A

75-77-4

chloro-trimethyl-silane

B

107-51-7

Octamethyltrisiloxane

C

141-62-8

decamethyltetrasiloxane

D

141-63-9

dodecamethylpentasiloxane

Conditions
ConditionsYield
at 60 - 65℃; for 10h; Further byproducts given;A 51%
B n/a
C n/a
D n/a
1825-62-3

ethyl trimethylsilyl ether

75-78-5

dimethylsilicon dichloride

107-51-7

Octamethyltrisiloxane

Conditions
ConditionsYield
Stage #1: ethyl trimethylsilyl ether With sodium hydroxide In pyridine at 70℃; for 1.5h;
Stage #2: dimethylsilicon dichloride In benzene
48%
75-77-4

chloro-trimethyl-silane

2943-62-6

1-chloro-1,1,3,3,3-pentamethyldisiloxane

A

107-51-7

Octamethyltrisiloxane

B

4342-25-0

1,2-Bis(trimethylsiloxy)-1,1,2,2-tetramethyl-disilan

C

56240-55-2

1-Trimethylsiloxy-pentamethyl-disilan

Conditions
ConditionsYield
With lithium In tetrahydrofuran at 20℃; for 96h; Substitution;A n/a
B n/a
C 46%
1450-14-2

1,1,1,2,2,2-hexamethyldisilane

A

75-76-3

tetramethylsilane

B

107-46-0

Hexamethyldisiloxane

C

107-51-7

Octamethyltrisiloxane

D

541-05-9

Hexamethylcyclotrisiloxane

E

141-62-8

decamethyltetrasiloxane

Conditions
ConditionsYield
With carbon monoxide; nickel at 200℃; under 750.06 Torr; for 2h; Product distribution; various reagents and reaction conditions;A n/a
B 25.8%
C n/a
D n/a
E n/a
2943-62-6

1-chloro-1,1,3,3,3-pentamethyldisiloxane

A

107-51-7

Octamethyltrisiloxane

B

4342-25-0

1,2-Bis(trimethylsiloxy)-1,1,2,2-tetramethyl-disilan

Conditions
ConditionsYield
Stage #1: 1-chloro-1,1,3,3,3-pentamethyldisiloxane With lithium In tetrahydrofuran for 14h; Metallation; Heating;
Stage #2: With chloro-trimethyl-silane In tetrahydrofuran at 20℃; for 24h; Condensation;
A n/a
B 23%
141-62-8

decamethyltetrasiloxane

A

107-46-0

Hexamethyldisiloxane

B

107-51-7

Octamethyltrisiloxane

C

141-63-9

dodecamethylpentasiloxane

Conditions
ConditionsYield
With molecular sieve at 20 - 100℃; for 0.017 - 24h; Product distribution / selectivity;A 12.98%
B 19.28%
C 13.74%
With linear phosphonitrilic chloride; diatomaclous earth (Celite 545) at 20 - 100℃; for 0.017 - 24h; Product distribution / selectivity;A 15.21%
B 18.64%
C 12.58%
With dodecylbenzene-sulphonic acid at 120℃; for 4 - 24h; Product distribution / selectivity;A 11.16%
B 15.02%
C 12.46%
99532-16-8

bis(trimethylsiloxy)(trimethylsilyl)methylsilane

A

1873-88-7

1,1,1,3,5,5,5-heptamethyltrisiloxan

B

107-51-7

Octamethyltrisiloxane

Conditions
ConditionsYield
at 850℃;A 14%
B 10%
4095-10-7

dimethyldibromosilane

107-46-0

Hexamethyldisiloxane

107-51-7

Octamethyltrisiloxane

Conditions
ConditionsYield
With iron(III) chloride
4095-10-7

dimethyldibromosilane

107-46-0

Hexamethyldisiloxane

A

107-51-7

Octamethyltrisiloxane

B

141-62-8

decamethyltetrasiloxane

Conditions
ConditionsYield
With iron(III) chloride
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Chemistry

IUPAC Name: Trisiloxane, 1,1,1,3,3,5,5,5-octamethyl-
The MF of Trisiloxane, 1,1,1,3,3,5,5,5-octamethyl- (107-51-7) is C8H24O2Si3.

                                         
The MW of Trisiloxane, 1,1,1,3,3,5,5,5-octamethyl- (107-51-7) is 236.534.
Synonyms of Trisiloxane, 1,1,1,3,3,5,5,5-octamethyl- (107-51-7): Methylpolysiloxane ; Dimethylbis(trimethylsilyloxy)silane ; Poly(dimethylsiloxane), hydroxy terminated ; Poly(dimethylsiloxane), 200(r) fluid ; Octamethyltrisiloxane ; [(Ch3)3sio]2si(ch3)2 ; 1,1,1,3,3,5,5,5-Octamethyltrisiloxane ; CO9816
Product Categories: Organics;Si (Classes of Silicon Compounds);Siloxanes;Si-O Compounds;Organometallic Reagents;Organosilicon
Form: clear colourless liquid
Index of Refraction: 1.404  
EINECS: 203-497-4
Density: 0.843 g/ml
Flash Point: 55 °C
Boiling Point: 153 °C
Melting Point: -86 °C
Storage temp: Flammables area
Merck: 6748

Uses

  Trisiloxane, 1,1,1,3,3,5,5,5-octamethyl- (107-51-7) is used as organic synthesis intermediate.

Safety Profile

Safety information of Trisiloxane, 1,1,1,3,3,5,5,5-octamethyl- (107-51-7):
Risk Statements 
10  Flammable
Safety Statements 
23  Do not breathe gas/fumes/vapor/spray (appropriate wording to be specified by the manufacturer)
24/25  Avoid contact with skin and eyes
RIDADR  UN 1993 3/PG 3
WGK Germany  3
F  10-21
TSCA  Yes
HazardClass  3.2
PackingGroup  III