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Showing posts with label
ALCOHOLS AND ETHERS:
.
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Showing posts with label
ALCOHOLS AND ETHERS:
.
Show all posts
Friday, February 7, 2020
Primary (1°) alcohols are poor starting materials for the synthesis of 1-alkenes. Why ?
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Because the 1°carbocation RCH 2 + rearranges and a 2-alkene is formed. Even if a 1-alkenes forms it tends to rearrange in acid to a 2-al...
To synthesize 2, 3-dimethylbut-1-ene in the better yield dehydrohalogenation of 2, 3-dimethyl-1-bromobutane is preferred over dehydration of 2, 3-dimethylhutan-1-ol. Why ?
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Because dehydration of alcohol is accompanied by a hydride shift leading to an intermediate 3°carbocation which gives 2, 3-dimethylbut-2...
Why dehydration proceeds in acid but not in base?
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OH - is a very poor leaving group (a strong base) hence it cannot be eliminated under basic conditions. But in the presence of acid -OH ...
Why alcohols do not undergo base induced dehydration in the same way that alkyl halides are dehydrohalogenated ?
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In the dehydration reaction of alcohols the leaving group is -OH - which is a very strong base. Thus reaction cannot proceed in the pres...
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