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How do eliminate biphenyl as a by product in a Grignard reaction?
Wiki User
∙ 12y ago
Biphenyl will be dissolved in ether along with your desired product after Grignard synthesis. If you add an aqueous sodium hydroxide (NaOH) solution to this it will react with your desired product but not the biphenyl and form two layers of solution. One layer will be biphenyl dissovled in ether the other will be NaX (where X is your desired product, just with the Na attached to an oxygen rather than a H) dissolved in water. The latter solution can be separated with a separatory funnel; it will be the lower layer. To precipitate you product from its aqueous solution just cool it and add hydrochloric acid (HCl). There you have it, that's how to eliminate byphenyl from your desired product. Hope it helped.
Wiki User
∙ 15y ago
Wiki User
∙ 12y agoNaOH will react with the alcohol formed and create a salt while the biphenyl will not. Then the ether layer can be discarded with the biphenyl in it and the salt formed can be acidified and will then return to the desired product. The the water created through those acid/base reactions will be removed through aqueous NaCl solution and anhydrous sodium sulfate.
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