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HomeProduct name list1,1,3,3-Tetramethyldisiloxane

1,1,3,3-Tetramethyldisiloxane

Synonym(s):1,1,3,3-Tetramethyldisiloxane

  • CAS NO.:3277-26-7
  • Empirical Formula: C4H14OSi2
  • Molecular Weight: 134.32
  • MDL number: MFCD00008256
  • EINECS: 221-906-4
  • SAFETY DATA SHEET (SDS)
  • Update Date: 2024-11-01 18:09:03
1,1,3,3-Tetramethyldisiloxane Structural

What is 1,1,3,3-Tetramethyldisiloxane?

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

The Uses of 1,1,3,3-Tetramethyldisiloxane

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.

The Uses of 1,1,3,3-Tetramethyldisiloxane

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.

The Uses of 1,1,3,3-Tetramethyldisiloxane

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.

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

Properties of 1,1,3,3-Tetramethyldisiloxane

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
Specific Gravity 0.757
color  colorless
explosive limit 0.8-62.9%(V)
Water Solubility  DECOMPOSES
Sensitive  Moisture Sensitive
Hydrolytic Sensitivity 3: reacts with aqueous base
BRN  1733364
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 information for 1,1,3,3-Tetramethyldisiloxane

Signal word Danger
Pictogram(s)
ghs
Flame
Flammables
GHS02
GHS Hazard Statements H225:Flammable liquids
Precautionary Statement Codes P210:Keep away from heat/sparks/open flames/hot surfaces. — No smoking.
P233:Keep container tightly closed.
P240:Ground/bond container and receiving equipment.
P241:Use explosion-proof electrical/ventilating/lighting/…/equipment.
P242:Use only non-sparking tools.
P243:Take precautionary measures against static discharge.

Computed Descriptors for 1,1,3,3-Tetramethyldisiloxane

InChIKey NVYQDQZEMGUESH-UHFFFAOYSA-N

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