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18-Crown-6

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18-Crown-6 Basic information

Product Name:
18-Crown-6
Synonyms:
  • 1,4,7,10,13,16-HEXAOXACYCLOOCTADECANE
  • 18-CROWN 6-ETHER
  • 18-CROWN-6
  • HEXAOXACYCLOOCTADECANE
  • CROWN-18-5-ETHER
  • CROWN ETHER/18-CROWN-6
  • AKOS BBS-00004361
  • JACS-17455-13-9
CAS:
17455-13-9
MF:
C12H24O6
MW:
264.32
EINECS:
241-473-5
Product Categories:
  • crown ether
  • Miscellaneous Reagents
  • API intermediates
  • Crown Ethers
  • Functional Materials
  • Macrocycles for Host-Guest Chemistry
  • catalyst
  • 17455-13-9
  • bc0001
  • OLED
Mol File:
17455-13-9.mol
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18-Crown-6 Chemical Properties

Melting point:
42-45 °C(lit.)
Boiling point:
116°C 0,2mm
Density 
1,175 g/cm3
refractive index 
1.4580 (estimate)
Flash point:
>230 °F
storage temp. 
Store below +30°C.
solubility 
Chloroform (Slightly), Methanol (Very Slightly)
form 
Crystals or Crystalline Mass or Liquid
color 
White or clear colorless
Water Solubility 
SOLUBLE
Sensitive 
Hygroscopic
Merck 
14,2602
BRN 
1619616
Stability:
Stable. Incompatible with strong acids, strong oxidizing agents.
InChIKey
XEZNGIUYQVAUSS-UHFFFAOYSA-N
CAS DataBase Reference
17455-13-9(CAS DataBase Reference)
NIST Chemistry Reference
1,4,7,10,13,16-Hexaoxacyclooctadecane(17455-13-9)
EPA Substance Registry System
1,4,7,10,13,16-Hexaoxacyclooctadecane (17455-13-9)
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Safety Information

Hazard Codes 
Xn,Xi
Risk Statements 
22-36/37/38-36-20/22-20/21/22
Safety Statements 
26-36-39
RIDADR 
2811
WGK Germany 
3
RTECS 
MP4500000
10
TSCA 
Yes
HazardClass 
6.1(b)
PackingGroup 
III
HS Code 
29329995
Toxicity
LD50 orally in Rabbit: 525 mg/kg LD50 dermal Rabbit 3888 mg/kg

MSDS

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18-Crown-6 Usage And Synthesis

Chemical Properties

slightly yellow solid

Uses

A useful phase transfer catalyst.

Uses

18-Crown-6 is used as an efficient phase transfer catalyst and as a complexing agent with a variety of small cation. It is involved in the synthesis of diaryl ethers, diaryl thioethers, and diarylamines mediated by potassium fluoride-alumina and 18-crown-6. It facilitates the solubility of potassium permanganate in benzene, which is used for oxidizing the organic compounds. It is used to accelerate various substitution reactions as well as enhances the power of nucleophiles such as potassium acetate. It is utilized in the alkylation reactions in the presence of potassium carbonate, N-alkylation of glutarimide and succinimide with dimethylcarbonate. The complex formed by its reaction with potassium cyanide acts as a catalyst in the cyanosilylation of aldehydes, ketones and quinines with trimethylsilyl cyanide (TMSCN).

Uses

18-Crown-6 may be used to catalyze the N-alkylation of heterocyclic compounds and allylation of functionalized aldehydes.

Definition

ChEBI: 18-crown-6 is a crown ether that is cyclooctadecane in which the carbon atoms at positions 1, 4, 7, 10, 13 and 16 have been replaced by oxygen atoms. It has a role as a phase-transfer catalyst. It is a crown ether and a saturated organic heteromonocyclic parent.

Synthesis Reference(s)

The Journal of Organic Chemistry, 39, p. 2445, 1974 DOI: 10.1021/jo00930a037

General Description

18-Crown-6 is the simplest crown ether that can be prepared by reacting triethylene glycol with triethylene glycol dichloride in the presence of potassium hydroxide as a base. 18-Crown-6 can solubilize metal salts, particularly potassium salts, in nonpolar and dipolar aprotic solvents. Thus, it is widely used as a phase transfer catalyst. It can also be used as a metal complexing agent to prepare a variety of molecular complexes.

Purification Methods

Recrystallise it from acetonitrile and dry it in a vacuum. Purify it also by precipitating the 18-crown-6/nitromethane 1:2 complex with Et2O/nitromethane (10:1 mixture). The complex is decomposed in vacuum whereby 18-crown-6 distils off under the reduced pressure. [Beilstein 19/12 V 601.]

18-Crown-6 Supplier

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