Triethoxysilane Property

Melting point:

-170°C

Boiling point:

134-135 °C(lit.)

Density 

0.89 g/mL at 25 °C(lit.)

vapor pressure 

9.21hPa at 20℃

refractive index 

n20/D 1.377(lit.)

Flash point:

80 °F

storage temp. 

Store at 0-5°C

solubility 

sol diethyl ether, THF, alkanes, aromatic and chlorinated solvents.

form 

A liquid

Specific Gravity

0.8753

Water Solubility 

Insoluble in water. Soluble in organic solvents.

Hydrolytic Sensitivity

7: reacts slowly with moisture/water

Sensitive 

Moisture Sensitive

BRN 

1738989

Stability:

Stable, but moisture sensitive. Flammable. Incompatible with strong oxidizing agents, strong acids, strong bases.

InChIKey

QQQSFSZALRVCSZ-UHFFFAOYSA-N

CAS DataBase Reference

998-30-1(CAS DataBase Reference)

NIST Chemistry Reference

Silane, triethoxy-(998-30-1)

EPA Substance Registry System

Triethoxysilane (998-30-1)

Safety

Hazard Codes 

T+,C,T

Risk Statements 

10-26-34-23/24/25

Safety Statements 

26-28-36/37/39-45

RIDADR 

UN 3384 6.1/PG 1

WGK Germany 

3

RTECS 

VV6682000

F 

10-21

TSCA 

Yes

HazardClass 

6.1

PackingGroup 

II

HS Code 

29209090

Hazardous Substances Data

998-30-1(Hazardous Substances Data)

Hazard and Precautionary Statements (GHS)

Symbol(GHS)

Signal word

Danger

Hazard statements

H226Flammable liquid and vapour

H302Harmful if swallowed

H315Causes skin irritation

H318Causes serious eye damage

H330Fatal if inhaled

Precautionary statements

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

P280Wear protective gloves/protective clothing/eye protection/face protection.

P301+P312IF SWALLOWED: call a POISON CENTER or doctor/physician IF you feel unwell.

P303+P361+P353IF ON SKIN (or hair): Remove/Take off Immediately all contaminated clothing. Rinse SKIN with water/shower.

P305+P351+P338IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continuerinsing.

Triethoxysilane Chemical Properties,Usage,Production

Description

Triethoxysilane is an organosilicon compound with the formula HSi(OC2H5)3. It is a colourless liquid used in precious metal-catalysed hydrosilylation reactions. The resulting triethoxysilyl groups are often valued for attachment to silica surfaces.Compared to most compounds with Si-H bonds, triethoxysilane exhibits relatively low reactivity. Like most silyl ethers, triethoxysilane is susceptible to hydrolysis. As reducing agent, triethoxysilane can for example be used in reduction of amides, reduction of carbonyl compounds in the presence of cobalt(II) chloride as catalyst, Cu-catalyzed reductive hydroxymethylation of styrenes, and Rh-catalyzed hydrodediazoniation.

Chemical Properties

Colorless, clear liquid

Physical properties

bp 134–135 °C; d 0.89 g cm?3.

Uses

Triethoxysilane is useful reagent for the hydrosilylation of carbon–carbon multiple bonds; reducing agent for carbonyl groups

Uses

Triethoxysilane is used in metal catalyzed hydrosilylation reactions.

Application

Reduces esters in the presence of zinc hydride catalyst. Reduces aldehydes and ketones to alcohols via the silyl ethers in presence of fluoride ion. Gives 1,2-reduction of enones to allyl alcohols.

General Description

Liquid. Used as a reducing agent.

Air & Water Reactions

May become pyrophoric, by generation of silane

Reactivity Profile

Triethoxysilane has been involved in cases where Triethoxysilane has disproportionated, generating silane (SiH4) which has a history of being pyrophoric.

Health Hazard

Toxicity is similar to silanes. Silanes are moderately irritating to skin, eyes, and mucous membranes. Silane compounds are toxic.

Fire Hazard

When heated to decomposition, Triethoxysilane emits acrid smoke and fumes.

Flammability and Explosibility

Highly flammable

Safety Profile

Poison by intravenous route.Moderately toxic by inhalation. Flammable liquid. Whenheated to decomposition it emits acrid smoke andirritating fumes.

Purification Methods

Fractionate it using a column packed with glass helices of ca 15 theoretical plates in an inert atmosphere. Store it in aliquots in sealed ampoules because it is sensitive to moisture. [Spauschus et al. J Am Chem Soc 72 1377 1950, MacKenzie et al. J Am Chem Soc 72 2032 1950, Havill et al. J Org Chem 13 280 1948, Beilstein 1 IV 1359.]