1,1,3,3-Tetramethyldisiloxane Property

Melting point:

<-78°C

Boiling point:

70-71 °C (lit.)

Density 

0.76 g/mL at 25 °C (lit.)

vapor pressure 

250 hPa (20 °C)

refractive index 

n20/D 1.370(lit.)

Flash point:

14 °F

storage temp. 

Store at <= 20°C.

solubility 

soluble in Chloroform

pka

11.9[at 20 ℃]

form 

liquid

color 

colorless

Specific Gravity

0.757

explosive limit

0.8-62.9%(V)

Water Solubility 

DECOMPOSES

Sensitive 

Moisture Sensitive

Hydrolytic Sensitivity

3: reacts with aqueous base

BRN 

1733364

InChIKey

NVYQDQZEMGUESH-UHFFFAOYSA-N

LogP

-0.38-4.5 at 20-25℃

CAS DataBase Reference

3277-26-7(CAS DataBase Reference)

NIST Chemistry Reference

((CH3)2SiH)2O(3277-26-7)

EPA Substance Registry System

Disiloxane, 1,1,3,3-tetramethyl- (3277-26-7)

Safety

Hazard Codes 

F

Risk Statements 

11-36/37/38-16

Safety Statements 

16-26-36-9-33-29

RIDADR 

UN 2924 3/PG 2

WGK Germany 

3

RTECS 

JN1000000

F 

10-21

Autoignition Temperature

240 °C

TSCA 

Yes

HazardClass 

3

PackingGroup 

II

HS Code 

29310095

Hazard and Precautionary Statements (GHS)

Symbol(GHS)

Signal word

Danger

Hazard statements

H225Highly Flammable liquid and vapour

Precautionary statements

P210Keep away from heat/sparks/open flames/hot surfaces. — No smoking.

P233Keep container tightly closed.

P240Ground/bond container and receiving equipment.

P241Use explosion-proof electrical/ventilating/lighting/…/equipment.

P242Use only non-sparking tools.

P243Take precautionary measures against static discharge.

1,1,3,3-Tetramethyldisiloxane Chemical Properties,Usage,Production

Description

1,1,3,3-Tetramethyldisiloxane is soluble in many organic solvents, such as aromatic hydrocarbon and petroleum hydrocarbons, and so on. This product is a kind of widely used organic silicon intermediates, and usually be used as organic silicon blocking agent. Due to containing reactive Si-H groups in the molecular structure, it can be used in the synthesis of copolymer macromolecule by hydrosilylation. The synthesis of copolymer macromolecule can be made into a series of reactive silicone oil.

Chemical Properties

Colorless or yellowish transparent liquid

Uses

1, 1, 3, 3-Tetramethyldisiloxane is a kind of siloxane derivative, and can be used as a monomer for the preparation of silicone polymers or silicone resins. It is used as an intermediate for preparing other organosilicon compounds. It is also used in non-aqueous polymer preparation as well as a laboratory reagent. In organic synthesis, it finds an application as an effective reducing agent in platinum-catalyzed reduction of carboxamides to amines as well as in the Au/TiO2-catalyzed hydrosilylation of carbonyl compounds (e.g., reduction of aldehydes or ketones) relative to monohydrosilanes. It can also enable a direct bromination of carboxylic acids in the presence of indium bromide (InBr3) as catalyst.

Uses

1. Synthesis of polysiloxane containing faculties end groups.
2. Can be used for the preparation of high performance organic silicone surfactants.
3. Applicable to the production of many products, such as addition silicon rubber, silica gel, Hydrogenpolysiloxane and plastic, resin modifier, dendrite polymer special additives, etc.

Uses

1,1,3,3-Tetramethyldisiloxane is used as a monomer in the production of silicone polymers or silicone resins. It is used as a precursor to prepare other organosilicon compounds. It is also utilized in non-aqueous polymer preparation as well as a laboratory reagent.

Flammability and Explosibility

Highly flammable

Purification Methods

1,Possible impurity is 1,1,5,5-tetramethyl-3-trimethylsiloxytrisiloxane b 154-155o/733mm. Fractionate it, collect fractions boiling below 80o and re-fractionate it. Its purity can be analysed by alkaline hydrolysis and measuring the volume of H2 liberated followed by gravimetric estimation of silica in the hydrolysate. It is unchanged when stored in glass containers in the absence of moisture for 2-3 weeks. Small amounts of H2 are liberated on long storage. Care should be taken when opening a container due to pressure developed. [Speier et al. J Am Chem Soc 79 974 1958, Emeléus & Smythe J Chem Soc 609 1958, IR: Kriegsmann Z Anorg Chem 299 78 1959, Beilstein 4 IV 3991.]

References

https://www.alfa.com/en/catalog/B23697/
http://www.organic-chemistry.org/chemicals/reductions/tetramethyldisiloxane-TMDSO.shtm
https://www.infona.pl/resource/bwmeta1.element.elsevier-722236cc-df38-37aa-bbed-029ec07d525f