Hexamethyldisiloxane

An organic compound, C6H18OSi2, 162.381 g/mol. Boiling point 99 °C, melting point -66 °C, as published.

verified recordOrganic compound9 measured properties

Identifiers

Molecular formula: C₆H₁₈OSi₂
Molecular weight: 162.381 g/mol
Exact mass: 162.089618 g/mol
IUPAC name: trimethyl(trimethylsilyloxy)silane
SMILES: C[Si](C)(C)O[Si](C)(C)C
InChI: InChI=1S/C6H18OSi2/c1-8(2,3)7-9(4,5)6/h1-6H3
InChIKey: UQEAIHBTYFGYIE-UHFFFAOYSA-N

Open in ReactionLens Use in reaction prediction

Measured properties

Published measurements, each with its source. Two readings of one property are both shown, in the units each used.

Boiling Point: 99 °Cmeasured · Hazardous Substances Data Bank (HSDB); 101 °C @760 [mm Hg]measured · PAC Chemical Database, U.S. Department of Energy
Melting Point: -66 °Cmeasured · Hazardous Substances Data Bank (HSDB); -59 °Cmeasured · PAC Chemical Database, U.S. Department of Energy
Density: 0.7638 at 20 °Cmeasured · Hazardous Substances Data Bank (HSDB); 0.76 @ 20°Cmeasured · PAC Chemical Database, U.S. Department of Energy
Solubility: In water, 0.93 mg/L at 25 °Cmeasured · Hazardous Substances Data Bank (HSDB); 0.93 mg/L @ 25 °C (exp)measured · Human Metabolome Database (HMDB)
Vapor Pressure: 42.0 [mmHg]measured · Haz-Map, Information on Hazardous Chemicals and Occupational Diseases
LogP: log Kow = 4.2measured · Hazardous Substances Data Bank (HSDB)
Flash Point: -30 °Cmeasured · Hazardous Substances Data Bank (HSDB)
Viscosity: 0.51 centistokes at 20 °Cmeasured · Mazzoni SM et al; pp 53-81 in Handbook Environ Chem, Vol 3. Chandra G, ed. Berlin, Germany: Springer (1997)
Refractive Index: Index of Refraction: 1.3774 at 20 °Cmeasured · Lide, D.R., G.W.A. Milne (eds.). Handbook of Data on Organic Compounds. Volume I. 3rd ed. CRC Press, Inc. Boca Raton ,FL. 1994., p. V3: 2518

Calculated properties

Derived from the structure, not from a sample; kept apart from the measurements above.

Molecular weight: 162.38 g/molcalculated · reference compound database; Average mass of one molecule, from reference compound database.
Exact mass: 162.08961826 Dacalculated · reference compound database; Mass of the most common isotopic form.
Polar surface area: 9.2 Å²calculated · reference compound database; Polar surface area as computed by reference compound database.
Complexity: 76calculated · reference compound database; A rough measure of how intricate the structure is.
H-bond donors: 0calculated · reference compound database
H-bond acceptors: 1calculated · reference compound database
logP: 2.6728calculated · chemistry engine; Estimated preference for oil over water. Higher means more oil-like.
Topological polar surface area: 9.23 Å²calculated · chemistry engine; Surface area from polar atoms; relates to how easily a molecule crosses membranes.
H-bond donors: 0calculated · chemistry engine; Atoms that can donate a hydrogen bond.
H-bond acceptors: 1calculated · chemistry engine; Atoms that can accept a hydrogen bond.
Rotatable bonds: 2calculated · chemistry engine; Single bonds the molecule can freely twist around.
Molar refractivity: 47.777 cm³/molcalculated · chemistry engine; Relates to the molecule's polarisability.
Fraction sp³ carbons: 1calculated · chemistry engine; Share of carbon atoms with tetrahedral bonding.
QED drug-likeness: 0.5673calculated · chemistry engine; Quantitative estimate of drug-likeness (0–1).

What it is made of

Elements

C Carbon6 atoms · 44.4% by mass
Si Silicon2 atoms · 34.6% by mass
H Hydrogen18 atoms · 11.2% by mass
O Oxygen1 atom · 9.9% by mass

Percentages are of the molecular weight above, worked out the same way the molar mass calculator does it.

Structure

Heavy atoms, hydrogen excluded: 9
Total atoms, hydrogen included: 27
Rings: 0
Aromatic rings: 0
Stereocentres: 0
Formal charge: 0

The molecule in three dimensions

Rotate and inspect the atoms. Loaded only when you ask, so the page stays light.

The drawing above is a diagram of what is bonded to what. A molecule is not flat, and the model here is one low-energy shape generated from the connectivity — useful for seeing which groups can reach each other, and not a measured structure. A real sample is a population of conformations, interconverting.

Reactions it appears in

No documented reaction with a written procedure and a source involves Hexamethyldisiloxane yet.

Other names for it

The systematic name on this record is trimethyl(trimethylsilyloxy)silane.

The sources also call it Disiloxane, hexamethyl-, Oxybis(trimethylsilane), Fluka AG, Hexamethyl disiloxane, Bis(trimethylsilyl)ether, Belsil DM 0.65, Bis(trimethylsilyl)oxide, Bistrimethylsilyl ether, KF 96L, Silane, oxybis(trimethyl-, Dow corning 200.

Structurally related

Nothing structurally close to Hexamethyldisiloxane has a page here yet.

Where these values came from

reference compound database24764
compound record
chemistry engine
structure perception

compound record.

What this page does not claim

Identifiers are copied from the source record, measured values are reported as published, and calculated values are marked as calculated. Nothing here is a hazard, purity or handling assessment — how the library is checked.