Diphenyldifluorosilane

CAS NO.：312-40-3
Empirical Formula: C12H10F2Si
Molecular Weight: 220.29
MDL number: MFCD00017898
EINECS: 206-226-8
SAFETY DATA SHEET (SDS)
Update Date: 2026-09-12 18:48:19

What is Diphenyldifluorosilane?

Physical properties

bp 246–247 °C, bp 156°C50 mmHg, bp 66–70°C0.5 mmHg; d 1.155 g cm?1.

The Uses of Diphenyldifluorosilane

A moisture insensitive equivalent of diphenyldichlorosilane that is more reactive toward nucleophiles. Source of phenyl group in the Hiyama coupling reaction. More stable to electrophilic aromatic substitution than diphenyldichlorosilane.
Eaborn reported that fluorosilanes are more reactive toward organometallic reagents than the corresponding chlorosilanes, and therefore more suited for preparation of sterically hindered organosilanes.

Preparation

commercially available. Readily prepared by oxidation of diphenylsilane with CuF2, or by treatment of diphenyldichlorosilane with HF, ZnF2, NaBF4, or (NH4)2SiF6. Rate enhancements of the chlorine–fluorine exchange have been achieved with ultrasound and addition of water. Diethoxydiphenylsilane and related structures are converted to diphenyldifluorosilane with 48% HF(aq).

Properties of Diphenyldifluorosilane

Boiling point:	159°C 50mm
Density	1.145
refractive index	1.522
Flash point:	87°C
storage temp.	under inert gas (nitrogen or Argon) at 2-8°C
solubility	soluble in ether.
Specific Gravity	1.145
Hydrolytic Sensitivity	8: reacts rapidly with moisture, water, protic solvents
CAS DataBase Reference	312-40-3(CAS DataBase Reference)
EPA Substance Registry System	Silane, difluorodiphenyl- (312-40-3)

Safety information for Diphenyldifluorosilane

Signal word	Danger
Pictogram(s)	Flame Flammables GHS02 Corrosion Corrosives GHS05
GHS Hazard Statements	H314:Skin corrosion/irritation
Precautionary Statement Codes	P210:Keep away from heat/sparks/open flames/hot surfaces. — No smoking. P280:Wear protective gloves/protective clothing/eye protection/face protection. P303+P361+P353:IF ON SKIN (or hair): Remove/Take off Immediately all contaminated clothing. Rinse SKIN with water/shower.