Tetraethylammonium hydroxide

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Tetraethylammonium hydroxide
IUPAC name
Tetraethylazanium hydroxide
3D model (JSmol)
ECHA InfoCard 100.000.977 Edit this at Wikidata
EC Number
  • 201-073-3
  • InChI=1S/C8H20N.H2O/c1-5-9(6-2,7-3)8-4;/h5-8H2,1-4H3;1H2/q+1;/p-1
  • CC[N+](CC)(CC)CC.[OH-]
Molar mass 147.262 g·mol−1
Appearance colorless solutions
GHS labelling:
GHS05: CorrosiveGHS09: Environmental hazard
H314, H410
P260, P264, P273, P280, P301+P330+P331, P303+P361+P353, P304+P340, P305+P351+P338, P310, P321, P363, P391, P405, P501
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).

Tetraethylammonium hydroxide is the organic compound with the formula (C2H5)4NOH, abbreviated Et4NOH. It is the tetraethylammonium salt of hydroxide. It is used and dispensed as solutions in water or alcohols, which are colorless and highly alkaline. The compound is a common reagent in organic synthesis. It is also employed in the preparation of zeolites.[1]


Structure of Et4NOH.4H2O.[2]

Tetraethylammonium hydroxide is most commonly encountered as an aqueous solution. Several hydrates NEt4OH·xH2O. have been crystallized, including x = 4, 5, 9. These salts feature well separated Et4N+ cations and hydroxide anions. The hydroxide groups are linked by hydrogen bonds to the water of crystallization. Anhydrous Tetraethylammonium hydroxide has not been isolated.

Synthesis and reactions[edit]

It is prepared from tetraethylammonium bromide by salt metathesis, using a hydroxide-loaded ion exchange column or by the action of silver oxide.[3] Attempted isolation of Et4NOH induces Hofmann elimination, leading to triethylamine and ethylene.

Treatment of Et4NOH with a wide range of acids gives water and the other tetraethylammonium salts:


  1. ^ Matsukata, Masahiko; Ogura, Masaru; Osaki, Takayuki; Hari Prasad Rao, Poladi Raja; Nomura, Mikihiro; Kikuchi, Eiichi (1999). "Conversion of dry gel to microporous crystals in gas phase". Topics in Catalysis. 9: 77–92. doi:10.1023/A:1019106421183.
  2. ^ Wiebcke, Michael; Felsche, Jürgen (2000). "NEt4OH·4H2O Xontaining Infinite Hydroxide–Water Ribbons". Acta Crystallographica Section C Crystal Structure Communications. 56 (7): 901–902. doi:10.1107/S0108270100005886. PMID 10935124.
  3. ^ Pelletier, Guillaume (2013). "Tetraethylammonium Hydroxide". Encyclopedia of Reagents for Organic Synthesis. doi:10.1002/047084289X.rn01547. ISBN 978-0471936237.