Octadecyltrichlorosilane

Octadecyltrichlorosilane (ODTS or n-octadecyltrichlorosilane) is an organosilicon compound with the formula CH₃(CH₂)₁₇SiCl₃. A colorless liquid, it is used as a silanization agent to prepare hydrophobic stationary phase, for reversed-phase chromatography.

Octadecyltrichlorosilane

Names
Preferred IUPAC name Trichloro(octadecyl)silane
Other names Trichlorooctadecylsilane Stearyltrichlorosilane
Identifiers
CAS Number	112-04-9 Y
3D model (JSmol)	Interactive image
Abbreviations	ODTS
ChemSpider	7865 N
EC Number	203-930-7
PubChem CID	8157
UNII	1QLE771PKE Y
InChI InChI=1S/C18H37Cl3Si/c1-2-3-4-5-6-7-8-9-10-11-12-13-14-15-16-17-18-22(19,20)21/h2-18H2,1H3 N Key: PYJJCSYBSYXGQQ-UHFFFAOYSA-N N InChI=1/C18H37Cl3Si/c1-2-3-4-5-6-7-8-9-10-11-12-13-14-15-16-17-18-22(19,20)21/h2-18H2,1H3 Key: PYJJCSYBSYXGQQ-UHFFFAOYAA
SMILES CCCCCCCCCCCCCCCCCC[Si](Cl)(Cl)Cl
Properties
Chemical formula	C18H37Cl3Si
Molar mass	387.93 g·mol−1
Appearance	Colorless liquid
Density	0.984 g/mL, liquid
Boiling point	223 °C (433 °F; 496 K) at 10 Torr
Solubility	organic solvents, decomp by amines and alcohols
Hazards
Occupational safety and health (OHS/OSH):
Main hazards	flammable, corrosive
GHS labelling:
Pictograms
Signal word	Danger
Hazard statements	H314
Precautionary statements	P280, P305+P351+P338, P310
NFPA 704 (fire diamond)	<imagemap> File:NFPA 704.svg|80px|alt=NFPA 704 four-colored diamond poly 150 150 300 300 150 450 0 300 Health 3: Short exposure could cause serious temporary or residual injury. E.g. chlorine gas poly 300 0 450 150 300 300 150 150 Flammability 2: Must be moderately heated or exposed to relatively high ambient temperature before ignition can occur. Flash point between 38 and 93 °C (100 and 200 °F). E.g. diesel fuel poly 450 150 600 300 450 450 300 300 Instability 2: Undergoes violent chemical change at elevated temperatures and pressures, reacts violently with water, or may form explosive mixtures with water. E.g. white phosphorus poly 300 300 450 450 300 600 150 450 Special hazards (white): no code desc none </imagemap> 3 2 2
Related compounds
Related Chlorosilanes	Dodecyltrichlorosilane
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). N verify (what is YN ?) Infobox references

It is also evaluated for forming self-assembled monolayers on silicon dioxide substrates. Its structural chemical formula is CH₃(CH₂)₁₇SiCl₃. It is flammable and hydrolyzes readily with release of hydrogen chloride.

Dodecyltrichlorosilane, an ODTS analog with shorter alkyl chain, is used for the same purpose.

ODTS-PVP films are used in organic-substrate LCD displays.