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DI-TERT-BUTYLDICHLOROSILANE

CAS No.18395-90-9
Chemical Name:DI-TERT-BUTYLDICHLOROSILANE
CBNumber:CB5725195
Molecular Formula:C8H18Cl2Si
Formula Weight:213.22
MOL File:18395-90-9.mol

DI-TERT-BUTYLDICHLOROSILANE Property

Melting point −15 °C(lit.)
Boiling point 190 °C729 mm Hg(lit.)
Density 1.009 g/mL at 25 °C(lit.)
refractive index n20/D 1.457(lit.)
Flash point 143 °F
storage temp. 2-8°C
solubility sol most common organic solvents.
form liquid
Specific Gravity 1.009
color Colorless to Light yellow
Hydrolytic Sensitivity 8: reacts rapidly with moisture, water, protic solvents
Sensitive Moisture Sensitive
BRN 1739236
CAS DataBase Reference 18395-90-9(CAS DataBase Reference)
FDA UNII 7SGG0354HO
EPA Substance Registry System Silane, dichlorobis(1,1-dimethylethyl)- (18395-90-9)
UNSPSC Code 12352001
NACRES NA.22

Safety

Hazard Codes :C
Risk Statements :34-37
Safety Statements :26-36/37/39-45
RIDADR :UN 2987 8/PG 2
WGK Germany :3
F :10-21
TSCA :No
HazardClass :8
PackingGroup :II
HS Code :29319090

NFPA 704:

	2
3		0

Hazard and Precautionary Statements (GHS)

Symbol(GHS)
Signal wordDanger
Hazard statements H314
Precautionary statements P280-P303+P361+P353-P304+P340+P310-P305+P351+P338-P363-P405

DI-TERT-BUTYLDICHLOROSILANE Price More Price(3)

Brand: Sigma-Aldrich(India)
Product number: 287660
Product name : Di-tert-butyldichlorosilane
Purity: 98%
Packaging: 5G
Price: ₹7025.43
Updated: 2022/06/14
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Brand: Sigma-Aldrich(India)
Product number: 287660
Product name : Di-tert-butyldichlorosilane
Purity: 98%
Packaging: 25G
Price: ₹18121.05
Updated: 2022/06/14
Buy: Buy

Brand: TCI Chemicals (India)
Product number: D2469
Product name : Di-tert-butyldichlorosilane
Purity: min. 95.0 %
Packaging: 5G
Price: ₹9600
Updated: 2022/05/26
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DI-TERT-BUTYLDICHLOROSILANE Chemical Properties,Usage,Production

Physical properties mp ?15°C; bp 190°C/729 mmHg; d 1.009 g cm?3.
Uses Reagent used for preparing siliranes and protecting diols.
Uses The presence of the bulky t-butyl groups in di-t-butyldichlorosilane has been found to increase the Si–C bond lengths slightly and to widen the CSiC bond angles by 11.1? relative to dichlorodimethylsilane as determined by electron diffraction and molecular mechanics calculations.
The di-t-butylsilylene protecting group for diols was introduced by Trost and Caldwell and used in a total synthesis of deoxypillaromycinone.It is introduced by the reaction of di-tbutyldichlorosilane with a 1,2- or 1,3-diol in acetonitrile in the presence of triethylamine and 1-hydroxybenzotriazole (HOBt) at 45–90°C (eq 1). For a related, highly reactive reagent see di-t-butylsilyl Bis(trifluoromethanesulfonate).
Preparation can be conveniently prepared by chlorination of di-t-butylsilane (CCl4/PdCl2 (cat), 85%)but various other methods of preparation have been reported.
Purification Methods Purify it by fractional distillation. 20 1.01. It is a colourless liquid with a pleasant odour and does not fume in moist air, but does not titrate quantitatively with excess of dilute alkali. [Tyler et al. J Am Chem Soc 70 2877 1948.] Di -tert-butyl silyl bis(trifluoromethanesulfonate) [85272 -31 -7] M 440.5, b 73.5 -7 4 . 5o/0.35mm, d 4 Purify it by fractional distillation at high vacuum. 20 1.36 (see pK for triflic acid). It is a pale yellow liquid which should be stored under argon. It is less reactive than the diisopropyl analogue. The presence of the intermediate monochloro compound can be detected by 1H NMR, (CHCl3): tert-Bu2Si(OTf)2 [ 1.25s], but impurities have 1.12s for tert-Bu2Si(H)OTf and 1.19s for tert-Bu2HSi(Cl)OTf. [Deslongchamps Tetrahedron Lett 23 4871 1982, Deslongchamps Aldrichimica Acta 17 72 1984.] TOXIC.