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Crown ethers

Cyclic polymer of ethylene glycol


Eg: 18 crown 6 [18th and O 6 O]

Oxiranes

Cyclic ethers

Ethers reaction

SN reactions [with HI,PCL5, H2O/heat/high pressure]

Ethers with excess HI

RI + ŔI

Ethers with Ltd HI

ROH + ŔI [R is benzene ring]

Reagents for ring opening of epoxy ether

CH3MgBr/H3O+ ,ŔOH/H+ ,R-O/ROH (base catalyst)

Oxidation, dehydration and rearrangement of ethers

Preparation of ethers