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Crown Ethers
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About Crown Ethers
Crown ethers are macrocyclic compounds containing equally spaced ether
linkages in a large ring system. They readily form complexes with metal
salts or ammonium salts. Depending on size, number and type of
heteroatom, crown ethers can exhibit selectivity toward specific metal cations.
For example, 12-crown-4 prefers to form complexes with Li+, whereas
18-crown-6 prefers K+. These crown-metal complexes are referred to as
host-guest chemistry where the crown ether is the host and
the
metal cation is the guest.
Crown ethers are used to separate cations, dissolve inorganic salts
into organic solvents to perform naked anion chemistry, serve as
phase transfer catalysts, and chiral crown ethers have been used to
resolve racemic mixtures or separate isomers by chiral chromatography.
Crown Ethers Produced by Parish Chemical
Benzo-15-crown-5
15-Crown-5
18-Crown-6
Cyclohexyl-15-crown-5
Dibenzo-18-crown-6 (below)
Dicyclohexyl-18-crown-6
Di-t-butyldibenzo-18-crown-6
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Structure |
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Name |
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Product # |
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CAS # |
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4,4(5)-Di(1-hydroxy-2-ethylhexyl)dibenzo-18-crown-6 |
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2970 |
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[97240-59-0] |
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 |
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4,4(5)-Di(1-hydroxybutyl)dibenzo-18-crown-6 |
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1233 |
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[74966-22-6] |
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4,4(5)-Di(1-hydroxydecyl)dibenzo-18-crown-6 |
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1658 |
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[79501-72-7] |
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 |
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4,4(5)-Di(1-hydroxyethyl)dibenzo-18-crown-6 |
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2433 |
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[69542-38-7] |
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4,4(5)-Di(1-hydroxyheptyl)dibenzo-18-crown-6 |
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1685 |
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[74966-03-3] |
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4,4(5)-Di(1-hydroxyhexyl)dibenzo-18-crown-6 |
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1260 |
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[74966-02-2] |
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4,4(5)-Di(1-hydroxyisobutyl)dibenzo-18-crown-6 |
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1234 |
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[74966-23-7] |
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4,4(5)-Di(1-hydroxymyristyl)dibenzo-18-crown-6 |
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1527 |
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[74639-77-3] |
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4,4(5)-Di(1-hydroxymyristyl)dibenzo-24-crown-8 |
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1740 |
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[74966-08-8] |
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4,4(5)-Di(1-hydroxynonyl)dibenzo-18-crown-6 |
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1281 |
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[74966-05-5] |
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4,4(5)-Di(1-hydroxyoctadecyl)dibenzo-18-crown-6 |
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2973 |
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[99308-18-6] |
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4,4(5)-Di-tert-butyldibenzo18-crown-6 |
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1541 |
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[29471-17-8] |
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4,4(5)-Di-tert-butyldicyclohexano-18-crown-6 |
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1702 |
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[38723-98-7] |
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4,4(5)-Di-tert-butyldicyclohexano-24-crown-8 |
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2903 |
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[70936-93-5] |
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4,4(5)-Diacetyldibenzo-18-crown-6 |
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2426 |
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[68817-65-2] |
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4,4(5)-Diacetyldibenzo-24-crown-8 |
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1469 |
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[74966-17-9] |
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4,4(5)-Dicarboxydibenzo-18-crown-6 |
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1219 |
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[78790-29-1] |
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4,4(5)-Didecanoyldibenzo-18-crown-6 |
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1140 |
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[74966-30-6] |
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4,4(5)-Didecanoyldibenzo-24-crown-8 |
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3394 |
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[70936-90-2] |
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4,4(5)-Diisopentanoyldibenzo-18-crown-6 |
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1821 |
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[74966-26-0] |
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4,4(5)-Dilauroyldibenzo-18-crown-6 |
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1338 |
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[74966-15-7] |
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4,4(5)-Dilauroyldibenzo-24-crown-8 |
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1515 |
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[74966-19-1] |
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4,4(5)-Dimethyldibenzo-18-crown-6 |
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1819 |
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[34368-73-5] |
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4,4(5)-Dimyristoyldibenzo-18-crown-6 |
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1737 |
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[74639-76-2] |
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4,4(5)-Dimyristoyldibenzo-24-crown-8 |
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1739 |
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[74966-20-4] |
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4,4(5)-Dioctadecanoyldibenzo-18-crown-6 |
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2643 |
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[74966-16-8] |
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4,4(5)-Dioctanoyldibenzo-18-crown-6 |
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1330 |
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[74966-29-3] |
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4,4(5)-Dipentanoyldibenzo-18-crown-6 |
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1294 |
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[74966-25-9] |
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4,4(5)-Dipentyldibenzo-18-crown-6 |
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1828 |
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[74966-09-9] |
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4,4(5)-Dipropionyldibenzo-18-crown-6 |
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1326 |
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[68817-66-3] |
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4,4,5,5-Tetranitrodibenzo-18-crown-6 |
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1714 |
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[61853-51-8] |
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4,4-Diaminodibenzo-18-crown-6 |
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1216 |
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[61406-52-7] |
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4,4-Dinitrodibenzo-18-crown-6 |
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1220 |
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[32082-45-4] |
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4,5-Dinitrodibenzo-18-crown-6 |
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2578 |
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[32082-46-5] |
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4,5-Dinitrobenzo-15-crown-5 |
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2675 |
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[60835-70-3] |
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b-Dibenzo-24-crown-8 (b-form) |
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3410 |
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[14174-09-5] |
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4-Aminobenzo-15-Crown-5 |
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2928 |
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[60835-71-4] |
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Benzo-15-Crown-5 |
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1405 |
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[14098-44-3] |
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Bis-4,4(5)-heptanoyldibenzo-18-crown-6 |
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1325 |
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[68817-64-1] |
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4-tert-Butylbenzo-15-crown-5 |
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1402 |
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[15196-73-3] |
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4-tert-Butylbenzo-18-crown-6 |
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1213 |
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[14098-26-1] |
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4-tert-Butylcyclohexo-15-crown-5 |
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1403 |
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[17454-49-8] |
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4-tert-Butylcyclohexo-18-crown-6 |
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1215 |
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[none] |
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13-Crab-4 |
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3427 |
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[none] |
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16-Crab-5 |
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3426 |
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[58484-45-0] |
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19-Crab-6 |
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3425 |
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[58484-46-1] |
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15-Crown-5, tech. |
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3424 |
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[none] |
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18-Crown-6 . acetonitrile complex |
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2428 |
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[none] |
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18-Crown-6 nitromethane complex |
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5354 |
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[none] |
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18-Crown-6, 50% in toluene |
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5089 |
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[none] |
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18-Crown-6, purified |
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2260 |
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[17455-13-9] |
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18-Crown-6, tech., 75-80% |
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3423 |
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[17455-13-9] |
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24-Crown-8 |
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2632 |
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[33089-37-1] |
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Cyclo(hexaethyleneglycol 2,6-pyridinedicarboxylate) |
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1271 |
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[68436-53-3] |
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Cyclo(tetraethylene glycol 2,6-pyridinedicarboxylate) |
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3365 |
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[64379-58-4] |
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Cyclo(tetraethylene glycol 4-chloro-2,6-pyridinecarboxylate) |
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5044 |
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[71022-76-9] |
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Cyclohexo-15-crown-5 |
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1404 |
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[17454-48-7] |
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4-Decanoylbenzo-15-crown-5 |
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1142 |
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[67722-64-9] |
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Di(2,3-decalino)-18-crown-6 |
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5323 |
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[none] |
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Di(2,3-naphtho)-18-crown-6 |
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2644 |
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[14098-27-2] |
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Di(2,3-naphtho)-28-crown-8 |
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2645 |
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[17455-24-2] |
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Di(2,3-naphtho)-30-crown-10 |
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2916 |
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[98793-05-6] |
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4,4'(5')-Di-tert-butyldibenzo-24-crown-8 |
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2902 |
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[71035-28-4] |
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1,7-Diaza-15-crown-5 |
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1715 |
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[31249-95-3] |
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1,10-Diaza-18-crown-6 |
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3024 |
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[23978-55-4] |
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Dibenzo-18-crown-6, 99% |
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1350 |
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[14187-32-7] |
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Dibenzo-18-crown-6, purified |
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5540 |
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[14187-32-7] |
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Dibenzo-18-crown-6, tech. |
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3411 |
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[14187-32-7] |
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Dibenzo-21-crown-7 |
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2636 |
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[14098-41-0] |
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a-Dibenzo-24-crown-8 |
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2261 |
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[14174-09-5] |
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Dibenzo-30-crown-10 |
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1423 |
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[17455-25-3] |
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Dicyclohexano-18-crown-6, purified |
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2032 |
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[16069-36-6] |
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Dicyclohexano-21-crown-7 |
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2637 |
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[17455-21-9] |
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Dicyclohexano-24-crown-8 |
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2262 |
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[17455-23-1] |
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Dicyclohexo-30-crown-10 |
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1433 |
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[17455-26-4] |
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2,5-Diketo-1,6,9,12,15,18-hexaoxacycloeicosane |
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3387 |
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[none] |
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2,5-Diketo-1,6,9,12,15-pentaoxacycloheptadecane |
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3385 |
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[none] |
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2,6-Diketo-1,7,10,13,16,19-hexaoxacyclohenicosane |
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3386 |
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[none] |
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2,6-Diketo-15-crown-5 |
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1144 |
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[63689-58-7] |
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2,6-Diketo-18-crown-6 |
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3389 |
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[62796-84-3] |
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2,6-Diketo-21-crown-7 |
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1396 |
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[63689-62-3] |
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1,10-Dithia-18-crown-6 |
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3366 |
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[296-39-9] |
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4-Formylbenzo-15-crown-5 |
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5336 |
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[60835-73-6] |
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2,5-Furano-15-crown-5 |
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5337 |
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[none] |
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Hexaaza-18-crown-6 trisulfate |
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2195 |
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[56187-09-8] |
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5,7,7,12,14,14-Hexamethyl-4,11-diene-1,4,8,11-tetraaza-14-crown-4 dihydrobromide hydrate |
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3341 |
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[56013-65-1] |
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4-Lauroylbenzo-15-crown-5 |
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1128 |
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[82361-79-3] |
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N-(Lisamine-rhodamine)-4-aminobenzo15-crown-5 |
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5341 |
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[none] |
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4-Methylbenzo-15-crown-5 |
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2677 |
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[32702-27-5] |
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2,3-Naphtho-12-crown-4 |
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2917 |
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[104547-98-0] |
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2,3-Naphtho-15-crown-5 |
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2915 |
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[17454-47-6] |
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2,3-Naphtho-18-crown-6 |
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2968 |
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[17454-52-3] |
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4-Nitrobenzo-15-crown-5 |
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2932 |
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[60835-69-0] |
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4-Octanoylbenzo-15-crown-5 |
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1141 |
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[82361-78-2] |
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Pentaaza-15-crown-5 pentahydrogensulfate |
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2708 |
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[295-64-7] |
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Pentaaza-15-crown-5, N,N,N",N",N""-pentatosylamide |
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2924 |
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[52601-74-8] |
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Polycrown DB-186-F, tech. |
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1477 |
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[53660-42-7] |
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Tetraaza-12-crown-4 N,N,N",N"-tetratosylamide |
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2933 |
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[52667-88-6] |
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Tetraaza-12-crown-4 tetraacetic acid -- sodium salts mixture |
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2923 |
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[60239-18-1] |
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Tetraaza-12-crown-4 tetraacetic acid ammonium salt |
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2647 |
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[60239-18-1] |
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Tetraaza-12-crown-4 tetrahydrochloride |
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1171 |
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[10045-25-7] |
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Tetraaza-12-crown-4 tetrahydrogen sulfate |
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2649 |
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[134765-72-3] |
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Tetraaza-12-crown-4-tetraacetic acid "free acid" (DOTA) |
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2650 |
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[60239-18-1] |
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Tetraaza-12-crown-4-tetraacetic acid, trisodium salt |
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5521 |
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[60239-18-1] |
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Tetraaza-14-crown-4 |
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2521 |
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[295-37-4] |
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1,4,9,12-Tetraoxacyclohexadecane-5,8,13,16-tetrone |
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3275 |
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[none] |
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1-Thia-9-crown-3 |
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1014 |
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[none] |
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1,4,7-Trithia-15-crown-5 |
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3244 |
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[none] |
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12-crown-4 |
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1816 |
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[294-93-9] |
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15-crown-5, purified |
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2259 |
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[33100-27-5] |
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21-crown-7 |
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2631 |
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[33089-36-0] |
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