Dibenzo-18-crown-6 , 98% , 14187-32-7
Synonym(s):
Dibenzo-18-crown-6;DB18C6;2,3,11,12-Dibenzo-1,4,7,10,13,16-hexaoxacyclooctadeca-2,11-diene;6,7,9,10,17,18,20,21-Octahydrodibenzo[b,k][1,4,7,10,13,16]hexaoxacyclooctadecene;Crown ether/Dibenzo-18-crown-6
CAS NO.：14187-32-7
Empirical Formula: C20H24O6
Molecular Weight: 360.4
MDL number: MFCD00005098
EINECS: 238-041-3
| Pack Size | Price | Stock | Quantity |
| 5G | RMB53.60 | In Stock |
|
| 25G | RMB178.40 | In Stock |
|
| 100G | RMB672.80 | In Stock |
|
| others | Enquire |
PRODUCT Properties
| Melting point: | 162-164 °C (lit.) |
| Boiling point: | 380-384 °C (679 mmHg) |
| Density | 1.1801 (rough estimate) |
| refractive index | 1.5200 (estimate) |
| Flash point: | 380-384°C/679mm |
| storage temp. | Store below +30°C. |
| solubility | 0.007g/l |
| form | Fluffy Powder |
| color | White to slightly beige |
| Water Solubility | sparingly soluble |
| λmax | 277nm(CH2Cl2)(lit.) |
| Sensitive | air sensitive |
| Merck | 14,2602 |
| BRN | 1162153 |
| InChIKey | YSSSPARMOAYJTE-UHFFFAOYSA-N |
Description and Uses
Dibenzo-18-crown-6 (DB18C6) is the first crown ether synthesized by Pedersen in 1967 and has the strongest binding affinity to a potassium cation (K+) among alkali metal cations. With the similarity of the sizes between K+ and the cavity of crown ether, it had long been believed that the binding selectivity comes from the size relationship between the metal cation and the cavity. However, it was reported that under identical experimental conditions, K+ bound strongly to all crown ethers (12-crown-4 to 24-crown-8) irrespective of the ring size among other cations such as Na+, Ca2+, and NH4+. Moreover, in the gas phase, 18-crown-6 (18C6) and dibenzo18-crown-6 (DB18C6) form preferential complexation in the order Li+ > Na+ > K+ > Rb+ > Cs+, while in the aqueous solution both of them show highest complexion capacity for K+ rather than Li+[1-2].
Crown ether/Dibenzo-18-crown-6 for synthesis. CAS 14187-32-7, molar mass 360.41 g/mol.
Safety
| Symbol(GHS) |  GHS07 |
| Signal word | Warning |
| Hazard statements | H319-H315-H335 |
| Precautionary statements | P261-P280a-P304+P340-P305+P351+P338-P405-P501a-P264-P280-P305+P351+P338+P337+P313 |
| Hazard Codes | Xi,Xn |
| Risk Statements | 36-36/37/38-20/21/22 |
| Safety Statements | 26-37/39-36 |
| WGK Germany | 2 |
| RTECS | HP5386000 |
| Hazard Note | Irritant |
| TSCA | Yes |
| HS Code | 29329995 |
| Toxicity | LD50 orally in Rabbit: 2600 mg/kg |
