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N-(tert-Butyldimethylsilyl)-N-methyl-trifluoroacetamide

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N-(tert-Butyldimethylsilyl)-N-methyl-trifluoroacetamide Basic information

Product Name:
N-(tert-Butyldimethylsilyl)-N-methyl-trifluoroacetamide
Synonyms:
  • MBDSTFA
  • DEUTERO-REGISIL-D18
  • N-TERT-BUTYLDIME.SILYL-N-ME.TRIFLUOROACE
  • N-TERT-BUTYLDIME.SILYL-N-ME.TRIFLUOROACE TAMIDE + 1% TBDMSCL
  • N-(TERT-BUTYLDIMETHYLSILYL)-N-METHYL-TRI FLUOROACETAMIDE, 97+%
  • N-(TERT-BUTYLDIMETHYLSILYL)-N-METHYLTRIF LUOROACETA
  • N-(TERT-BUTYLDIMETHYLSILYL)-N-METHYL-TRIFLUOROACETAMIDE, W/1% TBDMSCL, >=95%
  • N-TERT-BUTYLDIMETHYLSILYL-N-METHYL TRIFL
CAS:
77377-52-7
MF:
C9H18F3NOSi
MW:
241.33
EINECS:
616-455-9
Product Categories:
  • Amines
  • Intermediates & Fine Chemicals
  • Alkyldimethylsilylation (GC Derivatizing Reagents)
  • Si-N Compounds
  • Pharmaceuticals
  • Silylation Reagents
  • Analytical Chemistry
  • GC Derivatizing Reagents
  • Si (Classes of Silicon Compounds)
  • Silylacetamides
  • Silylation (GC Derivatizing Reagents)
Mol File:
77377-52-7.mol
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N-(tert-Butyldimethylsilyl)-N-methyl-trifluoroacetamide Chemical Properties

Boiling point:
172-175 °C(lit.)
Density 
1.036 g/mL at 25 °C(lit.)
refractive index 
n20/D 1.402(lit.)
Flash point:
127 °F
storage temp. 
2-8°C
solubility 
sol most aprotic organic solvents.
pka
-1.50±0.70(Predicted)
form 
Liquid
Specific Gravity
1.023
color 
Clear colorless to slightly yellow
Water Solubility 
decomposes
Sensitive 
Moisture Sensitive
Hydrolytic Sensitivity
8: reacts rapidly with moisture, water, protic solvents
BRN 
3606546
CAS DataBase Reference
77377-52-7(CAS DataBase Reference)
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Safety Information

Hazard Codes 
Xi,F
Risk Statements 
10-36/37/38
Safety Statements 
26-36-16-37/39-36/37/39
RIDADR 
UN 1993 3/PG 3
WGK Germany 
3
10-21
Hazard Note 
Flammable
TSCA 
No
HS Code 
2931 90 00
HazardClass 
3
PackingGroup 
III

MSDS

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N-(tert-Butyldimethylsilyl)-N-methyl-trifluoroacetamide Usage And Synthesis

Chemical Properties

clear colorless to slightly yellow liquid

Physical properties

bp 168–170°C; d 1.12 g cm?3.

Uses

N-tert-Butyldimethylsilyl-N-methyltrifluoroacetamide with 1% tert-butyldimethylchlorosilane is commonly used for the preparation of N-tert-butyldimethylsilyl ethanolamines resulting from the hydrolysis of nitrogen mustards. It is also used for selective O-silylation of N,O-diacylhydroxyl amines.

Uses

In the presence of 1% of t-butyldimethylchlorosilane as the catalyst, N-(t-butyldimethylsilyl)-N-methyltrifluoroacetamide (BSMTFA) functions as an extremely reactive t-butyldimethylsilylating reagent for alcohols, amines, carboxylic acids, and thiols. Silylation is generally completed within 5 min at 25°C in acetonitrile. This amide is more reactive than N-(t-butyldimethylsilyl)-N-methylacetamide.
In the protection of a hydroxy group, the resultant tbutyldimethylsilyl (TBDMS) ethers are stable under the conditions for acetate saponification and hydrogenation.These silyl ethers also remain intact towards the Jones reagent and Wittig reagents. The TBDMS ethers are approx. 10 times more stable against hydrolysis than the corresponding trimethylsilyl (TMS) ethers.Selective removal of the TBDMS group can be accomplished by use of dilute acetic acid or tetra-n-butylammonium fluoride in THF at 25°C.
Silylation of ketones by use ofBSMTFAoccurs in triethylamine and DMF at 40–60°C to give the corresponding silyl enol ethers in good to excellent yields (eq 1).In addition, silyl ether formation takes place in N-hydroxysuccinimide (88% yield) and Nhydroxypyrrole (99% yield) by use of BSMTFA in THF.

Uses

N-(tert-Butyldimethylsilyl)-N-methyl-trifluoroacetamide is a silylating agent used in the derivatization of various organic compounds (such as amino acids) for gas chromatogography-mass spectrometry (GC-MS) analysis.

Preparation

obtained in 91% yield by reaction of N-methyl-2,2,2-trifluoroacetamide (1.0 equiv) in benzene and acetonitrile (1:1 v/v) with NaH (1.0 equiv) and then with t-BuMe2SiCl (1.2 equiv) at 4°C.

Definition

ChEBI: An N-silyl compound that is N-methyltrifluoroacetamide in which the amide nitrogen is replaced by a tert-butyldimethylsilyl group.

General Description

N-tert-Butyldimethylsilyl-N-methyltrifluoroacetamide is a silylating reagent which replaces the active hydrogen with tert-Butyldimethylsilyl group. The tert-Butyldimethylsilyl derivatives are found to be more resistant to hydrolysis and stable compared to trimethylsilyl (TMS) derivatives. This reagent is suitable for GC-MS analysis since it produces mass spectra, which can be easily interpreted. It is widely used for the silylation of different alcohols, thiols, phenols, carboxylic acids, amines, and amides.

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