CHEM 2OB3 Lecture Notes - Lecture 14: Reagent, Stereospecificity, Bestway
25 Feb 2015
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14. 3: van der waals radii greater for those of methyl than hydrogen, doesn"t change geometry around the oxygen, the higher molecular weight, the higher the boiling point, ethers have a smaller amount of hydrogen bonding than alcohol and have smaller boiling point, the larger the ether, the bigger the boiling point, thf is one of the most commonly used solvent, ethers have two lone pairs of electrons to act as a ligand to stabilize metals. 14. 4: ether functions as a ligand to donate lone pairs to metal (mg) to stabilize the grignard reagent, aprotic so it is a good solvent, ethylene glycol is used often, crowns are oligomers of ethylene glycol (cyclic polyethers, red is delta negative and blue is delta positive, potassium fits in 18 c 6, crown ethers can get a salt to dissolve in a solvent, potassium fluoride is not very soluble in organic solvents, 18 c 6 can be used to solubilize the kf and benzene.
