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प्रश्न
What is meant by hydroboration-oxidation reaction? Illustrate it with an example.
Illustrate the hydroboration-oxidation reaction with an example.
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उत्तर
The addition of borane followed by oxidation is known as the hydroboration-oxidation reaction. For example, propan-1-ol is produced by the hydroboration-oxidation reaction of propene. In this reaction, propene reacts with diborane (BH3)2 to form trialkyl borane as an addition product. This addition product is oxidized to alcohol by hydrogen peroxide in the presence of aqueous sodium hydroxide.
\[\ce{\underset{Propene}{CH3 - CH = CH2} + BH3 -> CH3 - CH2 - CH2 - BH2 ->[CH3CH = CH2](CH3 - CH2 - CH2)2BH ->[CH3CH = CH2] \underset{Addition reaction}{(CH3 - CH2 - CH2)3B} ->[H2O/H2O/\overset{-}{O}H]\underset{Propanol}{3CH3 - CH2 - CH2 - OH}}\]
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संबंधित प्रश्न
How will you convert: Propene to Propan-2-ol?
Show how is the following alcohol prepared by the reaction of a suitable Grignard reagent on methanal?
\[\begin{array}{cc}
\ce{CH3 - CH - CH2OH}\\
|\phantom{......}\\
\ce{CH3}\phantom{...}
\end{array}\]
Show how is the following alcohol prepared by the reaction of a suitable Grignard reagent on methanal?
Write the mechanism of hydration of ethene to yield ethanol.
How is the following conversion carried out?
\[\ce{Propene -> Propan-2-ol}\]
How is the following conversion carried out?
\[\ce{Ethyl magnesium chloride -> Propan-1-ol}\]
How is the following conversion carried out?
\[\ce{Methyl magnesium bromide → 2-Methylpropan-2-ol}\]
Name the reagent used in the following reaction:
Butan-2-one to butan-2-ol.
Name the reagents used in the following reactions:
Aldehydes react with Grignard reagent to produce ____________.
Aldehydes are reduced to the corresponding alcohols by the addition of hydrogen in the presence of catalysts to form ____________.
Monochlorination of toluene in sunlight followed by hydrolysis by aq. \[\ce{NaOH}\] yields.
Benzaldehyde differs from acetaldehyde in that:
Ethyl alcohol can be prepared from Grignard reagent by the reaction of ____________.
Alkenes convert into alcohols by ____________.
When glycol is heated with dicorboxylic acid the product are
\[\ce{C3H8O ->[{[O]}][K2Cr2O7/H2SO4] C3H6O ->[I2 + NaOH(aq.)] CHI3}\]
In this reaction the first compound is:
\[\ce{? ->[\Delta, CN-][EtOH, H2O]}\] Benzoin.
The reactant is obtained by dry distillation of the calcium salts of the following pairs:
How are the following conversions carried out?
\[\ce{Methyl magnesium bromide->2-Methylpropan-2-ol}\]
