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Sigma-Aldrich

Potassium bis(trimethylsilyl)amide

95%

Synonym(s):

Hexamethyldisilazane potassium salt, Potassium hexamethyldisilazide

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About This Item

Linear Formula:
[(CH3)3Si]2NK
CAS Number:
40949-94-8
Molecular Weight:
199.48
Beilstein:
4006754
MDL number:
MFCD00010330
UNSPSC Code:
12352111
PubChem Substance ID:
24859460
NACRES:
NA.22

Assay

95%

SMILES string

C[Si](C)(C)N([K])[Si](C)(C)C

InChI

1S/C6H18NSi2.K/c1-8(2,3)7-9(4,5)6;/h1-6H3;/q-1;+1

InChI key

IUBQJLUDMLPAGT-UHFFFAOYSA-N

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General description

Potassium bis(trimethylsilyl)amide is commonly abbreviated as KHMDS with molecular formula [(CH3)3Si]2NK. It is widely used as Bronsted base in synthesis.

KHMDS is a base catalyst, that shows high activity and selectivity for the alkylation of alkylpyridines.

Application

Anionic initiator used in the preparation of poly(ethylene oxide). Sterically hindered base employed in selective cyclization reactions. Also used in the preparation of lanthanide complexes.

Features and Benefits

Potassium bis(trimethylsilyl)amide (KHMDS):
  • Easily available.
  • Good selectivity for the benzylic C−H bonds.
  • Good reactivity for sterically crowded C−H bonds.

Pictograms

Corrosion
GHS05

Signal Word

Danger

Hazard Statements

H314

Hazard Classifications

Eye Dam. 1 - Skin Corr. 1B

Supplementary Hazards

EUH014

Storage Class Code

8A - Combustible corrosive hazardous materials

WGK

WGK 3

Flash Point(F)

Not applicable

Flash Point(C)

Not applicable

Personal Protective Equipment

dust mask type N95 (US), Eyeshields, Gloves

Certificates of Analysis (COA)

Search for Certificates of Analysis (COA) by entering the products Lot/Batch Number. Lot and Batch Numbers can be found on a product’s label following the words ‘Lot’ or ‘Batch’.

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The Journal of Organic Chemistry, 58, 6177-6177 (1993)
Synthesis of poly(ethylene oxide) with heterobifunctional reactive groups at its terminals by an anionic initiator.
M Yokoyama et al.
Bioconjugate chemistry, 3(4), 275-276 (1992-07-01)
Aeilke J Kamphuis et al.
ChemSusChem, 12(15), 3635-3641 (2019-05-01)
The development of new families of active and selective single-component catalysts based on earth-abundant metal is of interest from a sustainable chemistry perspective. In this context, anionic mono(formazanate) iron(II) complexes bearing labile halide ligands, which possess both Lewis acidic and
Organometallics, 12, 2618-2618 (1993)
Potassium Amide-Catalyzed Benzylic C- H Bond Addition of Alkylpyridines to Styrenes
Zhai DD, et al.
Angewandte Chemie (Weinheim an der Bergstrasse, Germany), 57, 1650-1653 (2018)
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