Dibenzo-18-crown-6
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14187-32-7c1ccc2c(c1)OCCOCCOc1ccccc1OCCOCCO2YSSSPARMOAYJTE-UHFFFAOYSA-NDibenzo-18-crown-6 is a crown ether that is 18-crown-6 ortho-fused to two benzene rings at positions 8-9 and 17-18. It has a role as a phase-transfer catalyst. It is a member of benzenes and a crown ether.
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Warning
H315 (35.9%): Causes skin irritation [Warning Skin corrosion/irritation]
P261, P264, P264+P265, P271, P280, P302+P352, P304+P340, P305+P351+P338, P319, P321, P332+P317, P337+P317, P362+P364, P403+P233, P405, and P501 (click each P-code to see the statement)
Aggregated GHS information provided per 64 reports by companies from 6 notifications to the ECHA C&L Inventory. Each notification may be associated with multiple companies.
Chemical: Dibenzo[b,k][1,4,7,10,13,16]hexaoxacyclooctadecin, 6,7,9,10,17,18,20,21-octahydro-
Dibenzob,k1,4,7,10,13,16hexaoxacyclooctadecin, 6,7,9,10,17,18,20,21-octahydro-: Does not have an individual approval but may be used under an appropriate group standard
A mild skin and moderate eye irritant; Causes convulsions, lung changes and other liver changes in oral lethal-dose studies of rats; [RTECS] Crown ethers have caused convulsions, liver injury, and dermatitis in experimental animals; A skin and strong eye irritant; [Alfa Aesar MSDS] See 18-Crown-6.
개요Dibenzo-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].
용도Dibenzo-18-crown-6, is used as an important raw material and intermediate used in organic Synthesis, pharmaceuticals, agrochemicals and dyestuff. It is an important organic intermediate.
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14187-32-7DTXSID6022428CHEMBL345536CHEBI:358732white to slightly beige fluffy powder