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Predict all the alkenes that would be formed by dehydrohalogenation of the following halides with sodium ethoxide in ethanol and identify the major alkene : 2-chloro -2- methylbutane |
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Answer» Solution :2-Chloro-2-methylbutane has TWO different sets of equivalent b-hydrogens. In principle, it can give two alkenes (I and II). ACCORDING to Saytzeff rule, more highly substituted ALKENE (II) is more stable and is the major product. `underset("2-Chloro -2-methylbutane") (overset(beta)CH_(3) - underset(Cl)underset(|)overset(beta)overset(CH_(3))overset(|)C- overset(beta)CH_(2)CH_(3)) underset(-(HCl))overset(C_(2)H_(5)ONa//C_(2)H_(5)OH) to underset("Less stable, Minor product ")underset("2-Methylbut -2- ENE (I)")(CH_(2) =overset(CH_(3))overset(|)C - CH_(2)CH_(3)) + underset(("More stable, Major product ")) underset("2-Methylbut -2-ene (II)") (CH_(3) - overset(CH_(3))overset(|)C = CHCH_(3))` |
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