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L15111 Potassium tert-pentyloxide, 25% w/w in toluene

CAS Number
Potassium tert-amylate
Potassium tert-pentylate

Stock No. Size Price ($) Quantity Availability
L15111-AK 250ml 66.50
L15111-AU 1000ml 200.00
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Potassium tert-pentyloxide, 25% w/w in toluene


Chemical Properties

Formula Weight
Flash Point
Storage & Sensitivity
Moisture Sensitive. Air Sensitive. Store under Argon. Ambient temperatures.


Potassium tert-pentyloxide is a strong, hindered base used in combination with lithium diisopropyl amide to generate a superbase for the selective metallation of the aralkyl system at the 6-position of protected estradiols. It is used in organic synthesis, agrochemicals, pharmaceuticals, colorants and aroma chemicals. It acts as a catalyst in polymerization and isomerizations.


Air and moisture sensitive. Keep container tightly closed in a dry and well-ventilated place. Incompatible with strong oxidizing agents and acids. Reacts violently with water.

Literature References

Strong, hindered base, soluble in hydrocarbon solvents: J. Am. Chem. Soc., 108, 1306 (1987). Has been used in combination with LDA to generate a superbase for the selective metallation of the aralkyl system at the 6-position of protected estradiols: Synthesis, 1493 (1995).

Halasa, A. F.; Seo, K. S. Anionic solution copolymerization of α-methylstyrene with conjugated dienes above the ceiling temperature of alfa-methylstyrene. Eur. Polym. J. 2014, 51, 80-86.

Liu, W.; Xu, L. Ligand-controlled chemoselectivity in potassium tert-amylate-promoted direct C-H arylation of unactivated benzene with aryl halides. Tetrahedron 2014, 71 (30), 4974-4981.

GHS Hazard and Precautionary Statements

Hazard Statements: H225-H304-H314-H335-H336-H361d-H373

Highly flammable liquid and vapour. May be fatal if swallowed and enters airways. Causes severe skin burns and eye damage. May cause respiratory irritation. May cause drowsiness or dizziness. Suspected of damaging the unborn child. May cause damage to organs through prolonged or repeated exposure.

Precautionary Statements: P201-P202-P210-P233-P235-P240-P241-P242-P243-P260-P264b-P271-P281-P303+P361+P353-P304+P340-P305+P351+P338-P310-P330-P331-P363-P370+P378q-P501c

Obtain special instructions before use. Do not handle until all safety precautions have been read and understood. Keep away from heat/sparks/open flames/hot surfaces. - No smoking. Keep container tightly closed. Keep cool. Ground/bond container and receiving equipment. Use explosion-proof electrical/ventilating/lighting/ equipment. Use only non-sparking tools. Take precautionary measures against static discharge. Do not breathe dust/fume/gas/mist/vapours/spray. Wash face, hands and any exposed skin thoroughly after handling Use only outdoors or in a well-ventilated area. Use personal protective equipment as required. IF ON SKIN (or hair): Remove/Take off immediately all contaminated clothing. Rinse skin with water/shower. IF INHALED: Remove to fresh air and keep at rest in a position comfortable for breathing. IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing. Immediately call a POISON CENTER or doctor/physician. Rinse mouth. Do NOT induce vomiting. Wash contaminated clothing before reuse. In case of fire: Use CO2, dry chemical, or foam Dispose of contents/ container to an approved waste disposal plant

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