cannizzaro reactionの例文

• A general scheme of the Cannizzaro reaction is depicted below.
• For example, benzaldehyde decomposes into benzoic acid and benzyl alcohol, the Cannizzaro reaction.
• In the related Cannizzaro reaction the base is sodium hydroxide and then the reduction product is an alcohol.
• Third, a Cannizzaro reaction of the benzaldehyde in formaldehyde and potassium hydroxide affords the m-phenoxybenzyl alcohol.
• The Cannizzaro reaction is a competing reaction when two aldehyde molecules react by disproportionation to form the corresponding alcohol and carboxylic acid.
• In alkaline soils, formaldehyde would be broken down through the Cannizzaro reaction and become Urotropin, but not all soils are alkaline.
• If the aldehyde cannot form an enolate ( e . g ., benzaldehyde ), addition of strong base induces the Cannizzaro reaction.
• He is remembered today largely for the Cannizzaro reaction and for his influential role in the atomic-weight deliberations of the Karlsruhe Congress in 1860.
• Other cases where hydroxide can act as a nucleophilic reagent are amide hydrolysis, the Cannizzaro reaction, nucleophilic aliphatic substitution, nucleophilic aromatic substitution and in elimination reactions.
• This diketone reaction is related to other rearrangements : the corresponding keto-aldehyde ( one alkyl group replaced by hydrogen ) rearranges in a Cannizzaro reaction, the corresponding 1, 2-diol reacts in a pinacol rearrangement.
• Examples include the Cannizzaro reaction, where approximately 50 % of the reactant aldehyde becomes the other oxidation state of the target, the Wittig reaction, where high-mass phosphorus reagents are used but ultimately become waste, and the Gabriel synthesis, which produces a stoichiometric quantity of phthalic acid
• In this, it was thought to resemble the classic Cannizzaro reaction mechanism, in which the attack of a hydroxylate on an aldehyde renders it into a tetravalent alcohol anion; this anion donates its hydrogens to a second aldehyde, forming a carboxylic acid and an alcohol . ( In effect, two identical aldehydes reduce and oxidize each other, leaving the net oxidation state the same .)