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577928

Sigma-Aldrich

Lithium bis(trimethylsilyl)amide solution

1 M in toluene

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Synonym(s):
LiHMDS, Hexamethyldisilazane lithium salt
Linear Formula:
[(CH3)3Si]2NLi
CAS Number:
Molecular Weight:
167.33
Beilstein:
3567910
MDL number:
PubChem Substance ID:
NACRES:
NA.22

concentration

1 M in toluene

density

0.860 g/mL at 25 °C

SMILES string

[Li]N([Si](C)(C)C)[Si](C)(C)C

InChI

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

InChI key

YNESATAKKCNGOF-UHFFFAOYSA-N

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This Item
225770324620766917
density

0.860 g/mL at 25 °C

density

0.891 g/mL at 25 °C

density

0.860 g/mL at 25 °C (lit.)

density

0.893 g/mL at 25 °C

Quality Level

200

Quality Level

200

Quality Level

200

Quality Level

100

General description

Lithium bis(trimethylsilyl)amide solution (LiHMDS) is generally used in organic synthesis as a non-nucleophilic strong Bronsted base.

Application

LiHMDS can be used as a reagent:
  • In the deprotonation and nucleophilic difluoromethylation reactions.
  • To synthesize isoquinoline derivatives by the addition of N-iodosuccinimide (NIS) to the α-benzyl tosylmethyl isocyanides.
  • To prepare arylboronic acid pinacol esters by the reaction of aryl fluorides with bis(pinacolato)diboron via palladium-catalyzed cross-coupling reaction.

Lithium bis(trimethylsilyl)amide is generally used in organic synthesis as a non-nucleophilic strong Brønsted base. It can be used for salt metathesis reaction for the synthesis of cesium bis(trimethylsilyl)amide (CsHMDS) and lithium fluoride by reacting with cesium fluoride.

Signal Word

Danger

Hazard Classifications

Aquatic Chronic 3 - Asp. Tox. 1 - Eye Dam. 1 - Flam. Liq. 2 - Repr. 2 - Self-heat. 1 - Skin Corr. 1B - STOT RE 2 - STOT SE 3

Target Organs

Central nervous system

Supplementary Hazards

Storage Class Code

4.2 - Pyrophoric and self-heating hazardous materials

WGK

WGK 3

Flash Point(F)

48.0 °F - closed cup

Flash Point(C)

8.9 °C - closed cup

Personal Protective Equipment

dust mask type N95 (US), Eyeshields, Gloves

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Structural Studies of Cesium, Lithium/Cesium, and Sodium/Cesium Bis (trimethylsilyl) amide (HMDS) Complexes
Ojeda-Amador AI, et al.
Inorganic Chemistry, 55(11), 5719-5728 (2016)
LiHMDS-Promoted Palladium or Iron-Catalyzed ipso-Defluoroborylation of Aryl Fluorides
Zhao X, et al.
Organic Letters, 38(18), 25-44 (2011)
Synthesis of 1-Substituted Isoquinolines by Heterocyclization of TosMIC Derivatives: Total Synthesis of Cassiarin A
Gutierrez S, et al.
Organic Letters, 38(18), 187-208 (2016)
Development of synthetic routes to dolutegravir
Syntheses of Heterocyclic Compounds Synthesis of Heterocycles in Contemporary Medicinal Chemistry, 38(18), 3187-3188 (1997)
Selective fluoroalkylation of organic compounds by tackling the ?negative fluorine effect?
Fluorous chemistry, 38(18), 187-208 (2016)

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