Octamethylcyclotetrasiloxane

Base Information

• Chemical Name: Octamethylcyclotetrasiloxane
• CAS No.: 556-67-2
• Deprecated CAS: 104986-37-0,83874-62-8,117563-66-3,1257661-59-8,117563-66-3,1257661-59-8,83874-62-8
• Molecular Formula: C8H24O4Si4
• Molecular Weight: 296.618
• Hs Code.: 29319090
• European Community (EC) Number: 209-136-7
• ICSC Number: 0310
• NSC Number: 345674
• UNII: CZ227117JE
• DSSTox Substance ID: DTXSID7027205
• Nikkaji Number: J428F
• Wikipedia: Octamethylcyclotetrasiloxane
• Wikidata: Q2013804
• RXCUI: 1363578
• Metabolomics Workbench ID: 53983
• ChEMBL ID: CHEMBL1869229
• Mol file: 556-67-2.mol

Synonyms:octamethylcyclotetrasiloxane

Chemical Property of Octamethylcyclotetrasiloxane

Chemical Property:

• Appearance/Colour: Colorless clear liquid
• Vapor Pressure: 1.57mmHg at 25°C
• Melting Point: 17-18 °C(lit.)
• Refractive Index: n20/D 1.396(lit.)
• Boiling Point: 175 °C at 760 mmHg
• Flash Point: 63.2 °C
• PSA: 36.92000
• Density: 0.95 g/cm³
• LogP: 2.87360
• Storage Temp.: 2-8°C
• Sensitive.: Moisture Sensitive
• Solubility.: <0.001g/l Hydrolysis
• Water Solubility.: INSOLUBLE
• Hydrogen Bond Donor Count: 0
• Hydrogen Bond Acceptor Count: 4
• Rotatable Bond Count: 0
• Exact Mass: 296.07516538
• Heavy Atom Count: 16
• Complexity: 197

Purity/Quality:

98% ^*data from raw suppliers

DPF2 ^*data from reagent suppliers

Safty Information:

• Pictogram(s): N
• Hazard Codes: Xn
• Statements: 53-62-10
• Safety Statements: 36/37-46-51-61

MSDS Files:

SDS file from LookChem

Total 1 MSDS from other Authors

Useful:

• Chemical Classes: Metals -> Metalloid Compounds (Silicon)
• Canonical SMILES: C[Si]1(O[Si](O[Si](O[Si](O1)(C)C)(C)C)(C)C)C
• Inhalation Risk: No indication can be given about the rate at which a harmful concentration of this substance in the air is reached on evaporation at 20 °C.
• Uses: Octamethylcyclotetrasiloxane is used as a monomer in the production of silicone polymers and as an intermediate in the production of other organosilicon substances.Further it finds its application in electronics, textiles, personal care products and household care products. Polydimethylsiloxane by the Polymerization of Octamethylcyclotetrasiloxane: To a resin flask equipped with a thermometer, stirrer, and reflux eondenser is added 1000 gm of octamethylcyclotetrasiloxane. The siloxane is heated to 165°C, and then 0.14gm of a potassium hydroxide-isopropanol complex (neutral equivalent = 193.5) is added to give a Si : Κ ratio of 4470:1. In 25 min the stirrer begins to stall, and the polymer is now heated for 3(1/2) hr at 150°C to complete polymerization. The resulting polymer has an intrinsic viscosity of 1.5 dl/gm corresponding to a molecular weight of 804,600.

Technology Process of Octamethylcyclotetrasiloxane

There total 119 articles about Octamethylcyclotetrasiloxane which guide to synthetic route it. The literature collected by LookChem mainly comes from the sharing of users and the free literature resources found by Internet computing technology. We keep the original model of the professional version of literature to make it easier and faster for users to retrieve and use. At the same time, we analyze and calculate the most feasible synthesis route with the highest yield for your reference as below:

synthetic route:

Reference yield: 60.0%

dimethylsilicon dichloride (75-78-5,30107-43-8) → octamethylcyclotetrasiloxane (556-67-2) + tetradecamethylcycloheptasilane (13452-94-3) + decamethylcyclopentasilane (13452-92-1) + dodecamethylcyclohexasilane (4098-30-0)

Guidance literature:

With tetrahydrofuran; lithium; Further byproducts given. Yields of byproduct given; 0 deg C, 1 h, then 20-25 deg C, 2 h;

Reference yield: 42.0%

dimethylsilicon dichloride (75-78-5,30107-43-8) → tetradecamethylcycloheptasiloxane (107-50-6) + Hexamethylcyclotrisiloxane (541-05-9) + octamethylcyclotetrasiloxane (556-67-2) + decamethylcyclopentasiloxane (541-02-6) + dodecamethyl-cyclohexasiloxane (540-97-6)

Guidance literature:

With H₂O; In water; slow addn. of 4l (CH3)2SiCl2 to 12l H2O at 15-20°C withorous stirring; further products;; distn.;;

DOI:10.1021/ja01207a004

Reference yield: 35.0%

dimethylsilicon dichloride (75-78-5,30107-43-8) → Hexamethylcyclotrisiloxane (541-05-9) + octamethylcyclotetrasiloxane (556-67-2) + decamethylcyclopentasiloxane (541-02-6) + dodecamethyl-cyclohexasiloxane (540-97-6)

Guidance literature:

With dimethyl sulfoxide; at 0 ℃; Further byproducts given;

upstream raw materials:

diethyl ether

dimethyldibromosilane

diethoxy dimethylsilane

dimethylsilicon dichloride

Downstream raw materials:

bis-(2-methoxy-ethoxy)-dimethyl-silane

1,3-bis-(2-methoxy-ethoxy)-1,1,3,3-tetramethyl-disiloxane

octamethyltrisiloxabe

1,11-bis-(2,4-dichloro-benzoyloxymethyl)-1,1,3,3,5,5,7,7,9,9,11,11-dodecamethyl-hexasiloxane

Refernces

• 1、 Brook, Michael A.,Liao, Mengchen,Zheng, Sijia. "Silylating Disulfides and Thiols with Hydrosilicones Catalyzed by B(C6F5)3". supporting information. p. 2694 - 2700. Retrieved 2021/06/25.
• 2、 Ganin, Anton S.,Moskalik, Mikhail Yu.,Astakhova, Vera V.,Sterkhova, Irina V.,Shainyan, Bagrat A.. "Heterocyclization and solvent interception upon oxidative triflamidation of allyl ethers, amines and silanes". . . Retrieved 2020/07/20.