| Hexamethyldisiloxane | |
|---|---|
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| IUPAC name | Hexamethyldisiloxane |
| Other names | HMDS HMDSO Bis(trimethylsilyl) ether Bis(trimethylsilyl) oxide |
| Identifiers | |
| CAS number | [107-46-0] |
| RTECS number | JM9237000 |
| SMILES | CSi(C)(C)OSi(C)(C)C |
| Properties | |
| Molecular formula | C6H12OSi2 |
| Molar mass | 162. IUPAC Nomenclature is a system of naming Chemical compounds and of describing the science of Chemistry in general CAS registry numbers are unique numerical identifiers for Chemical compounds Polymers biological sequences mixtures and Alloys They are also referred to Registry of Toxic Effects of Chemical Substances ( RTECS) is a Database of Toxicity information compiled from the open scientific literature without reference A chemical formula is a way of expressing information about the Atoms that constitute a particular Chemical compound, and how the relationship between those atoms changes Molar mass, symbol M, is the Mass of one mole of a substance ( Chemical element or Chemical compound) 38 g/mol |
| Appearance | colorless liquid |
| Density | 0. The density of a material is defined as its Mass per unit Volume: \rho = \frac{m}{V} Different materials usually have different 764 g/cm3 |
| Melting point |
−59 °C |
| Boiling point |
101 °C |
| Solubility in water | low |
| Solubility in other solvents | all organic solvents |
| Refractive index (nD) | 1. The melting point of a solid is the temperature range at which it changes state from solid to Liquid. The boiling point of a liquid is the temperature at which the Vapor pressure of the liquid equals the environmental pressure surrounding the liquid Solubility is the characteristic Physical property referring to the ability of a given substance the Solute, to dissolve in a Solvent. Water is a common Chemical substance that is essential for the survival of all known forms of Life. Solubility is the characteristic Physical property referring to the ability of a given substance the Solute, to dissolve in a Solvent. The refractive index (or index of Refraction) of a medium is a measure for how much the speed of light (or other waves such as sound waves is reduced inside the medium 377 |
| Hazards | |
| Main hazards | flammable |
| R-phrases | 11 |
| S-phrases | 16 |
| Related compounds | |
| Related compounds | Tetramethylsilane Dimethyl ether Bis(trimethylsilyl)amine |
| Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa) Infobox disclaimer and references |
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Hexamethyldisiloxane is a chemical compound with the formula O[Si(CH3)3]2. Occupational safety and health is a cross-disciplinary area concerned with protecting the Safety, Health and welfare of people engaged in R-phrases (short for Risk Phrases) are defined in Annex III of European Union Directive 67/548/EEC: Nature of special risks attributed to dangerous S-phrases are defined in Annex IV of European Union Directive 67/548/EEC: Safety advice concerning dangerous substances and preparations. Tetramethylsilane (abbreviated as TMS) is the Chemical compound with the formula Si(CH34 or SiMe4 (Me = CH3 Dimethyl ether is the organic compound with the formula CH3OCH3 Bis(trimethylsilylamine (also known as hexamethyldisilazane or HMDS is a chemical reagent with the Molecular formula (CH33Si-NH-Si(CH33 In Chemistry, the standard state of a material is its state at 1 bar (100 Kilopascals exactly A chemical compound is a substance consisting of two or more different elements chemically bonded together in a fixed proportion by Mass. This volatile liquid is used as a solvent and as a reagent. A solvent is a liquid or gas that dissolves a solid liquid or gaseous Solute, resulting in a Solution. The species arises by the hydrolysis of trimethylsilyl chloride. Hydrolysis is a Chemical reaction during which one or more water molecules are split into hydrogen and hydroxide ions which may go on to participate in further reactions Trimethylsilyl chloride, also known as chlorotrimethylsilane is a Silyl halide, with a variety of different uses in chemistry The molecule is the protypical silyl ether and can be considered a subunit of polydimethylsiloxane. Polydimethylsiloxane (PDMS is the most widely used Silicon -based organic Polymer, and is particularly known for its unusual rheological (or
Uses
It is primarily used as source of the trimethylsilyl functional group (-Si(CH3)3) in organic synthesis. For tetramethylsilane which also abbreviated as TMS see Tetramethylsilane. In Organic chemistry, functional groups are specific groups of Atoms within Molecules that are responsible for the characteristic Chemical reactions Organic synthesis is a special branch of Chemical synthesis and is concerned with the construction of Organic compounds via Organic reactions Organic For example, in the presence of acid catalyst, it converts alcohols and carboxylic acids into the silyl ethers and silyl esters, respectively. Catalysis is the process in which the rate of a Chemical reaction is increased by means of a Chemical substance known as a catalyst [1]
HMDS is used as an internal standard for calibrating chemical shift in1H NMR spectroscopy. In Nuclear magnetic resonance (NMR the chemical shift describes the dependence of nuclear magnetic energy levels on the electronic environment in a Molecule. Hydrogen (ˈhaɪdrədʒən is the Chemical element with Atomic number 1 Nuclear magnetic resonance spectroscopy, most commonly known as NMR spectroscopy, is the name given to a technique which exploits the magnetic properties of certain nuclei It is more easily handled since it is less volatile than the usual standard tetramethylsilane but still displays only a singlet near 0 ppm. Tetramethylsilane (abbreviated as TMS) is the Chemical compound with the formula Si(CH34 or SiMe4 (Me = CH3
HMDS has even poorer solvating power than alkanes. It is therefore sometimes employed to crystallize highly lipophilic compounds. Crystallization is the (natural or artificial process of formation of solid Crystals precipitating from a homogeneous --> identical Solution
It is also used in liquid bandages (spray on plasters) like in cavilon spray used on the body to protect damaged skin from irritation from other bodily fluids.
Safety
Like most siloxanes, hexamethyldisiloxane is fairly innocuous.
References
- ^ Pfeifer, J. "Hexamethyldisiloxane" in Encyclopedia of Reagents for Organic Synthesis (Ed: L. Paquette) 2004, J. Wiley & Sons, New York. DOI: 10. 1002/047084289.
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